Re: [QGIS-Developer] "Actions" menu in feature forms

[Luca Lanteri]

if you set an action in layer properties you will find into the action menu

Il Gio 17 Mag 2018, 6:43 PM Alessandro Pasotti  ha
scritto:

> In current master there is an empty "Actions" menu in the forms.
>
> What is it?
>
> --
> Alessandro Pasotti
> w3:   www.itopen.it
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Re: [Qgis-developer] problem with ON INSERT TO ... DO INSTEAD postgres rules

[Luca Lanteri]

I resolve the problem by adding the RETURNING clause in the INSERT RULES
fololwed by all single field name and with a dummy value where I can't
returning the real value, eg:

REATE OR REPLACE RULE insert_generalita AS
ON INSERT TO sifrap.v_frane_pol_full DO INSTEAD  INSERT INTO
sifrap.iffi_pol (idfrana, tipopol, the_geom)
  VALUES (new.idfrana, new.tipopol, st_multi(new.the_geom))
  RETURNING
iffi_pol.gid,
iffi_pol.idfrana,
''::text AS idesteso,
1::smallint tipopol,
''::CHARACTER VARYING tipo_poligono,
1::smallint tipo,
[...].

It seem all works fine.
Thanks for the tips !

Luca


2017-01-23 18:45 GMT+01:00 Luca Lanteri <lklant...@gmail.com>:

> Hi Matthias,
>
> thanks for your answer. Sorry but I missed your previous mail.
> Now I've seen that in your example you used TRIGGERS to update your data,
> instead in my case I use view RULES.
> I try to add "RETURNING new" clause in the rules but it doesn't work.
>
> I can try to change all my code and substitute RULES with TRIGGERS but I
> still hope there is another way to maintain the possibility of using rules.
> Is It possible that I'm just missing a simply solution because I don't
> know well the using of RETURNING in postgres views?
>
> thanks
> Luca
>
>
> 2017-01-23 18:15 GMT+01:00 Matthias Kuhn <matth...@opengis.ch>:
>
>> Hi Luca,
>>
>> this was a deliberate change to allow QGIS to directly use the newly
>> inserted features (e.g. add child records to a newly created feature).
>>
>> To make the views compatible with this, all you need to do is add a
>>
>> RETURN NEW;
>>
>> to the end of the insert function (I think). Have a look at the views
>> which I linked in my response in the other thread.
>>
>> We could possibly add a flag to specify in which cases we need the new
>> primary key and in which cases not.
>> But I somehow suspect, that in the end we will need to specify this in
>> some often-used code (e.g. add feature form) and in the end one will
>> still be required to update all views and we have some half-baked
>> pointless workaround code inside QGIS.
>>
>> Hope that helps for you!
>> Matthias
>>
>> On 01/23/2017 04:19 PM, Luca Lanteri wrote:
>> > Hi to all,
>> >
>> > after a short disscussion in qgis user list I've opened this ticket [0],
>> > because starting from QGIS 2.16 I can't insert new feature in postgres
>> > views using rules. When I try to insert a new feature I have this error
>> > [1]. All works fine with QGIS 2.14. The problem happens only with INSERT
>> > rules. UPDATE and DELETE are ok.
>> >
>> > I saw that for simple rules I can add a RETURNING * clause and all works
>> > fine, but I have a lot of complex view that use many tables, so
>> > RETURNING * clause doesn't work and compose the clause it's really hard.
>> >
>> > Then I have some question:
>> > 1) Is it really an issue or the problem is due to a new functionality of
>> > QGIS ?
>> > 2) In the first case, it could be considered a regression for it works
>> > on QGIS 2.14 ?
>> > 3) Is there a simple way to modify my views by adding a RETURNING clause
>> > without specify all returning field (* doesn't work) ?
>> >
>> > I love to know if it's a deliberate change or it's just a bug,so I can
>> > choose if I have to modify all my views, in order to allow me to migrate
>> > to QGIS 2.18.
>> >
>> > Many thanks in advance
>> > Regards
>> > Luca
>> >
>> >
>> > [0] https://hub.qgis.org/issues/16083
>> >
>> > [1] Impossibile applicare le modifiche al vettore v_frane_pol_full
>> >
>> > Errori: ERRORE: 1 geometria non aggiunta.
>> > Errori della sorgente dati:
>> > Errore PostGIS nell'aggiunta delle geometrie: ERROR: cannot perform
>> > INSERT RETURNING on relation "v_frane_pol_full"
>> >
>> > HINT: You need an unconditional ON INSERT DO INSTEAD rule with a
>> > RETURNING clause.
>> >
>> >
>> >
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Re: [Qgis-developer] problem with ON INSERT TO ... DO INSTEAD postgres rules

[Luca Lanteri]

Hi Matthias,

thanks for your answer. Sorry but I missed your previous mail.
Now I've seen that in your example you used TRIGGERS to update your data,
instead in my case I use view RULES.
I try to add "RETURNING new" clause in the rules but it doesn't work.

I can try to change all my code and substitute RULES with TRIGGERS but I
still hope there is another way to maintain the possibility of using rules.
Is It possible that I'm just missing a simply solution because I don't know
well the using of RETURNING in postgres views?

thanks
Luca


2017-01-23 18:15 GMT+01:00 Matthias Kuhn <matth...@opengis.ch>:

> Hi Luca,
>
> this was a deliberate change to allow QGIS to directly use the newly
> inserted features (e.g. add child records to a newly created feature).
>
> To make the views compatible with this, all you need to do is add a
>
> RETURN NEW;
>
> to the end of the insert function (I think). Have a look at the views
> which I linked in my response in the other thread.
>
> We could possibly add a flag to specify in which cases we need the new
> primary key and in which cases not.
> But I somehow suspect, that in the end we will need to specify this in
> some often-used code (e.g. add feature form) and in the end one will
> still be required to update all views and we have some half-baked
> pointless workaround code inside QGIS.
>
> Hope that helps for you!
> Matthias
>
> On 01/23/2017 04:19 PM, Luca Lanteri wrote:
> > Hi to all,
> >
> > after a short disscussion in qgis user list I've opened this ticket [0],
> > because starting from QGIS 2.16 I can't insert new feature in postgres
> > views using rules. When I try to insert a new feature I have this error
> > [1]. All works fine with QGIS 2.14. The problem happens only with INSERT
> > rules. UPDATE and DELETE are ok.
> >
> > I saw that for simple rules I can add a RETURNING * clause and all works
> > fine, but I have a lot of complex view that use many tables, so
> > RETURNING * clause doesn't work and compose the clause it's really hard.
> >
> > Then I have some question:
> > 1) Is it really an issue or the problem is due to a new functionality of
> > QGIS ?
> > 2) In the first case, it could be considered a regression for it works
> > on QGIS 2.14 ?
> > 3) Is there a simple way to modify my views by adding a RETURNING clause
> > without specify all returning field (* doesn't work) ?
> >
> > I love to know if it's a deliberate change or it's just a bug,so I can
> > choose if I have to modify all my views, in order to allow me to migrate
> > to QGIS 2.18.
> >
> > Many thanks in advance
> > Regards
> > Luca
> >
> >
> > [0] https://hub.qgis.org/issues/16083
> >
> > [1] Impossibile applicare le modifiche al vettore v_frane_pol_full
> >
> > Errori: ERRORE: 1 geometria non aggiunta.
> > Errori della sorgente dati:
> > Errore PostGIS nell'aggiunta delle geometrie: ERROR: cannot perform
> > INSERT RETURNING on relation "v_frane_pol_full"
> >
> > HINT: You need an unconditional ON INSERT DO INSTEAD rule with a
> > RETURNING clause.
> >
> >
> >
> > ___
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> > Qgis-developer@lists.osgeo.org
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> > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
> >
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[Qgis-developer] problem with ON INSERT TO ... DO INSTEAD postgres rules

[Luca Lanteri]

Hi to all,

after a short disscussion in qgis user list I've opened this ticket [0],
because starting from QGIS 2.16 I can't insert new feature in postgres
views using rules. When I try to insert a new feature I have this error
[1]. All works fine with QGIS 2.14. The problem happens only with INSERT
rules. UPDATE and DELETE are ok.

I saw that for simple rules I can add a RETURNING * clause and all works
fine, but I have a lot of complex view that use many tables, so RETURNING *
clause doesn't work and compose the clause it's really hard.

Then I have some question:
1) Is it really an issue or the problem is due to a new functionality of
QGIS ?
2) In the first case, it could be considered a regression for it works on
QGIS 2.14 ?
3) Is there a simple way to modify my views by adding a RETURNING clause
without specify all returning field (* doesn't work) ?

I love to know if it's a deliberate change or it's just a bug,so I can
choose if I have to modify all my views, in order to allow me to migrate to
QGIS 2.18.

Many thanks in advance
Regards
Luca


[0] https://hub.qgis.org/issues/16083

[1] Impossibile applicare le modifiche al vettore v_frane_pol_full

Errori: ERRORE: 1 geometria non aggiunta.
Errori della sorgente dati:
Errore PostGIS nell'aggiunta delle geometrie: ERROR: cannot perform INSERT
RETURNING on relation "v_frane_pol_full"
HINT: You need an unconditional ON INSERT DO INSTEAD rule with a RETURNING
clause.
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Re: [Qgis-developer] Warning - shapefile corruption on 2.16/master and how to recover

[Luca Lanteri]

I've encountered the same problem when i try to split some polygons.

I don't really understand what was the problem, just some hint:

- it occours only on windows. The same shapefile works fine on Linux.
- it also affects qgis 2.14
- is not connected with topology error. The problem remain also after using
v.clean.

I hope this could be useful
Luca
Il 16/Set/2016 03:08, "Nyall Dawson"  ha scritto:

> Unfortunately a fairly nasty regression has slipped in to 2.16 and is
> still present on master. This results in shapefile corruption in
> certain circumstances.
>
> While I've hit this issue maybe 3 or 4 times in the last 2 months, I
> haven't been able to track down exactly what causes this. It seems
> related to using the split or reshape tool on a shapefile, then saving
> the changes and getting the errors "Cannot reopen datasource
> xxx.shp|layerid=0 in read-only mode" and "Data source is invalid
> (Unable to open xxx.shx or xxx.SHX.Try --config SHAPE_RESTORE_SHX true
> to restore or create it)" in the log.
>
> A full report is at http://hub.qgis.org/issues/15570
>
> Hopefully we can resolve this before the next round of releases. In
> the meantime, there's a workaround for recovering data:
>
> In the same folder as the shapefile there'll be additional files
> "xxx_packed.shp" and "xxx_packed.shx". Renaming the "xxx_packed.shx"
> file to "xxx.shx" allows the original shapefile to be reopened.
>
> Nyall
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[Qgis-developer] Fwd: qgis 2.12 problemi di snap

[Luca Lanteri]

Hi,

I noticed a strange behavior using snap feature with qis 2.12.

I try to describe it:
- Edit a layer with active snap on a second layer.
- move polygon vertex.
- sometimes new points are added to another polygon in the editing layer,
sometimes where I move the vertex (as you can see in [0], sometimes far
away from it, but in any case snapped with the second layer.

I haven't yet find the complete sequence to reproduce the error, so I
attach a video [0] to describe the problem.

Do you know if it's a known issue or can anyone confirm it ?
If confirmed it could be a very insidious issue, because it can damage the
layer.

I tested it on 2.12 and 2.13 (and with less accuracy on 2.8) 64bit on linux
mint 17.3.

Thanks
Luca

[0] https://drive.google.com/open?id=0B1XiZk5sA7aIVW9MSjhwb04xWjg
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Re: [Qgis-developer] [Qgis-user] QGIS - value relation widget

[Luca Lanteri]

Sadly, after further test I discover that the crashes remain, so I think it
is a qgis bug and not a problem in my code.
The problem happens when I put my custom form into a subform widget
(QgsRelationEditorWidget). If I add a new record in the subform and I move
to another record using the left column QGIS crashes. It seems to be a more
general problem because the crash appears also when I add some simple
control that modify the object in the form.

I can open a ticket and add some test data.
If it is a minor bug and it could be resolved easily I really offer a pizza
and a beer to resolve it.

All the best
Luca


2015-10-01 23:53 GMT+02:00 Luca Lanteri <mesca...@gmail.com>:

> Hi,
>
> now I'm already using the python logic but my code is terrible and I have
> a lot of crash problem.
> Now that I using your example all is easier and seem to worsk fine.
>
> I owe you one beer.
> Many many tanks !
>
> Luca
>
>
> 2015-10-01 22:23 GMT+02:00 Blumentrath, Stefan <stefan.blumentr...@nina.no
> >:
>
>> Hi Luca,
>>
>>
>>
>> Sounds like a case for Python logic!
>>
>> General principles are explained here:
>>
>>
>> http://nathanw.net/2011/09/05/qgis-tips-custom-feature-forms-with-python-logic/
>>
>>
>>
>> Also nice, and probably exactly what you are looking for:
>>
>> http://medspx.fr/blog/Qgis/cascade_forms/
>>
>>
>>
>> Cheers
>>
>> Stefan
>>
>>
>>
>> *From:* qgis-user-boun...@lists.osgeo.org [mailto:
>> qgis-user-boun...@lists.osgeo.org] *On Behalf Of *Luca Lanteri
>> *Sent:* 1. oktober 2015 22:07
>> *To:* qgis-user <qgis-u...@lists.osgeo.org>
>> *Subject:* [Qgis-user] QGIS - value relation widget
>>
>>
>>
>> Hi to all,
>>
>> I need to build a form when the value of a combo are filtered basing on
>> the value of anoter combobox.
>> I have a first combo where I choose the region and a second with the
>> municipalities.
>> I need that the second combo shows only the municipalities of the choosed
>> region.
>> I tried to use use the widget "relationship value" with the a filter like
>> classe_munic = attribute($currentfeature, 'classe_munic') without any
>> success.
>>
>> Has anyone ever done something similar?
>> Thank in advance
>>
>>
>> Luca
>>
>
>
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[Qgis-developer] QGSrelationeditorwidget in custom form

[Luca Lanteri]

Hi,

I'm using the QGSrelationeditorwidget in a custom form with qtcreator.
It works very well (very powerful feature !) but I have some problem:

The first is that I can't fit my subform due to the large amount of data
present inside of it. I wondering if it were possible to set the width of
the leftmost column (where there is the selection of the related record)
because it is huge and it use the main part of my form. I try to see in the
properties of the widget but unsuccessfully.

The second problem is that I can't activate my custom objects into the
subform when I switch to editing mode because I can't find the proper
signal. Is there a signal
for QGSrelationeditorwidget that say to me when the subform goes in editing
mode ?

Thank in advance
Luca
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[Qgis-developer] add toogle editing into custom form

[Luca Lanteri]

Hi,
excuse me for the very very newby question.

I want to add a button in my custom form in order to toogle the editing
status of a layer. I try to navigate the qgis api but I can't understand
the way to stop editing and save/reject modify. I try to insert a code like
this [0] (obviously the else part doesn't fit my request, it's just a
pleaceholder to try my code).

[0]
def toggleEdit():
aLayer = QgsMapLayerRegistry.instance().mapLayersByName('layer')[0]
if not aLayer.isEditable():
aLayer.startEditing()
else:
aLayer.rollBack(True)

any hint ?
thanks in advance

Luca
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Re: [Qgis-developer] [Qgis-user] Poor performance with large projects

[Luca Lanteri]

I can confirm this issue. I've the same problem when work with my complex
projects.
I'm not a developer so I can't propose a solution but I'm available for
testing.

Luca

2015-02-06 9:52 GMT+01:00 Sam Ingarfield sjfingarfi...@gmail.com:

 Hi Everyone,

 I have been suffering from *very* poor performance on a number of
 projects, which only seems to become noticeable on large, complex projects.
 I have filed a bug with regards to this, see
 http://hub.qgis.org/issues/12125. Giovanni suggested I cross-post on the
 developer and user lists to see if others are experiencing the problem/have
 any ideas on what's going on.

 The issue I am experiencing manifests in two ways:
 a) Very slow project loading times (30mins at times). Someone on the bug
 tracker suggested that this may in part be related to the retrieval of
 extent and geometry from postgis layers. I've had a look at the debugging
 logs (from the master build) and this seems to be the case, for what I
 estimate as about half the loading time.
 b) Very slow addition and removal of layers after the first save event.
 From a quick look at the debug output, it seems that after the first save,
 the entire project is being reloaded on each layer addition/removal, which
 takes a very long time. Before the first save event, performance is very
 good, addition and removal of layers is virtually instantaneous.

 Obviously long project times are annoying but manageable, so long as I
 only have to load the project infrequently. The second issue, however,
 makes Qgis pretty much unworkable and leads to very long times between
 saves (and the inevitable quit  reload to restore performance) which is
 poor practice.

 To give you an idea of the difference between pre and post-save behaviour,
 Qgis emits about 850 lines of debugging output pre-save, rising to over
 430,000 lines post-save when adding a layer to one of my projects.

 Am happy to share debugging output with a developer off-list if that would
 help nail down what is happening and could lead to a fix.

 Cheers;
 Sam Ingarfield.


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Re: [Qgis-developer] python code in form

[Luca Lanteri]

Hi Matthias,

this is exactly what I need!
many thanks

Luca


2015-01-06 11:59 GMT+01:00 Matthias Kuhn matth...@opengis.ch:

  Hi Luca,

 There was a *DEBUGMODE* attribute introduced some time ago, that can be
 set on the python form module. If it is set to True, the changes should be
 reloaded automatically when you reopen the form.

 Matthias



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Re: [Qgis-developer] python code in form

[Luca Lanteri]

Hi Bernard, thanks for the tip. I've seen DataDrivenInputMask some time ago
and I promised myself to deepen it because I use lots of data stored
postgres and this plugin seems very useful. However the main limitations
for this very project are that I must use custom forms (to insert the
project logo and more stuff) and it also should work with spatialite.

thanks
Luca


2015-01-05 10:02 GMT+01:00 Bernhard Ströbl bernhard.stro...@jena.de:

 Hi Luca,

 this is a bit off topic but when you store your data in PostgreSQL you
 might want to try out the DataDrivenInputMask plugin [1] which has a lot of
 (database) intelligence in the form and can be customized to hold even
 more. Maybe you do not need to customize QGIS' forms any more.

 Bernhard

 [1] http://plugins.qgis.org/plugins/DataDrivenInputMask/

 Am 04.01.2015 22:39, schrieb Luca Lanteri:

  Hi,

 I'm using the init python function in order to add python code into my
 QGIS forms. This is a great function because I can add intelligence to
 my form without write a plugin, but I still have some problems:
 - I want to store qml and .ui file directly into Postgres so that when
 my users load a layer from postrgres they've my forms and styles,
 without pass to us a qgis project, but in this way I loose the python
 code. Is there a way to store also the python code in postgres or into
 qml?
 - when I change my python code, qgis can't auto reload it. I have to
 save the file with a different name and I have to change the name in the
 layer properties. Is there a way to force autoreload of the code, also
 only for debugging?

 I also thought to move my code in a plugin to bypass those problems but
 I think I've to rewrite all useful function that come with the forms
 properties, eg: the combo population. is It right or there's a way to
 include the QGIS forms add-on into a plugin?

 Sorry for my newbie's question and thanks in advance.
 Luca





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[Qgis-developer] python code in form

[Luca Lanteri]

Hi,

I'm using the init python function in order to add python code into my QGIS
forms. This is a great function because I can add intelligence to my form
without write a plugin, but I still have some problems:
- I want to store qml and .ui file directly into Postgres so that when my
users load a layer from postrgres they've my forms and styles, without pass
to us a qgis project, but in this way I loose the python code. Is there a
way to store also the python code in postgres or into qml?
- when I change my python code, qgis can't auto reload it. I have to save
the file with a different name and I have to change the name in the layer
properties. Is there a way to force autoreload of the code, also only for
debugging?

I also thought to move my code in a plugin to bypass those problems but I
think I've to rewrite all useful function that come with the forms
properties, eg: the combo population. is It right or there's a way to
include the QGIS forms add-on into a plugin?

Sorry for my newbie's question and thanks in advance.
Luca
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Re: [Qgis-developer] feature cloned when using python init function in forms

[Luca Lanteri]

Thanks Matthias,

I search in the bug tracker some days ago and I didn't find this bug.
I'm too slow to send my issues, or others Qgis users are too fast !
;-)

regards


2014-07-22 8:20 GMT+02:00 Matthias Kuhn matthias.k...@gmx.ch:

 Hi Luca,

 there is an issue report open for this [1]

 Kind regards,
 Matthias

 [1] http://hub.qgis.org/issues/10862


 On Mon 21 Jul 2014 11:07:59 PM CEST, Luca Lanteri wrote:

 Hi to all,

 moving to qgis 2.4 I noticed a strange behaviour: if I define a python
 init function for a form in Layer properties - Field menu every
 time that I insert a new feature this is inserted twice. Anyone can
 confirm this behaviour ? It's a new bug of the 2.4 ?
 If I use qgis 2.0 all works fine.

 Thank in advance

 Luca



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[Qgis-developer] feature cloned when using python init function in forms

[Luca Lanteri]

Hi to all,

moving to qgis 2.4 I noticed a strange behaviour: if I define a python init
function for a form in Layer properties - Field menu every time that I
insert a new feature this is inserted twice. Anyone can confirm this
behaviour ? It's a new bug of the 2.4 ?
If I use qgis 2.0 all works fine.

Thank in advance

Luca
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Re: [Qgis-developer] master slow reading rasters?

[Luca Lanteri]

I had the same problem on a old version od qgis using large  raster with
rotation parameter into the tfw file.  May be the same issue?
Il 21/mar/2014 09:30 Paolo Cavallini cavall...@faunalia.it ha scritto:

 -BEGIN PGP SIGNED MESSAGE-
 Hash: SHA1

 Il 20/03/2014 18:28, Giovanni Manghi ha scritto:

  yes, apparently it depends on the size of the raster (I'm trying with
 pretty large ones)
 
  how much large? I'm testing with 9gb rasters and it is lighting fast
  (just fast wothout overviews).

 3Gb
 Perhaps this has something to do with colour table?

 - --
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 Corsi QGIS e PostGIS: http://www.faunalia.eu/training.html
 -BEGIN PGP SIGNATURE-
 Version: GnuPG v1
 Comment: Using GnuPG with Icedove - http://www.enigmail.net/

 iEYEARECAAYFAlMr+IsACgkQ/NedwLUzIr7SQwCeIghnSuiLMtNInJv1lZ62h8w6
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[Qgis-developer] point displacement style

[Luca Lanteri]

Hi to all,

I'm using the point diplacement style. I noticed that it doesn't use the
new label engine for labelling the diplaced simbol, so the collision engine
doesnt' work.
There's in plain to migrate it to the new label engine? It could be useful
if I open a ticket ?

I also have some visualization problem, because at some scale the point
displaced symbols disappear (tested on qgis 2.10 Master - Ubuntu
13.04-64bit). Anyone can confirm this problem ?

Thanks in advance
Luca
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Re: [Qgis-developer] point displacement style

[Luca Lanteri]

Hi Andreas,

thanks for your prompt reply !
I start to use this useful function for a project ant it resolve to me a
lot of problem.


2014-01-31 Andreas Neumann a.neum...@carto.net:

 Hi Luca,

 I can't help with the labeling. At the time the point displacement
 renderer was developed (about 5 years ago), the labeling engine wasn't
 as advanced as it is today. So it wasn't an option and also not
 necessary to the project.

 I would not regard this as a bug request, but as a feature request and I
 guess it would a substantial bit of work to integrate the new labeling
 engine with the point displacement renderer.

 Ok, I thought that it was due to this problem. I can open a request
feature ticket, just to keep track of it.


 Do you have an idea how it should behave? I guess, depending on how many
 points there are there isn't a solution to perfectly label all points.


I have at least 4-5 point in the circle. My points stay in a layer,
geographically linked with another point layer (all point have the same
coord) that contain only 1 point. I have 2 kind of problem:
- the first one is when I have just 1 point in the first layer, so the
point is not drawn in a circle and  the two layer are overlapping. On kind
solution is to allow to displace point in a circle also when there is just
one point in a place.

- the second one is when I have more than 1 point and the label of the
displaced point overlapping with the second layer label.


-

 The point displacement renderer could also be improved to display points
 in a cluster, not just around the circle, but also inside the circle.
 This would be more complex to implement, but it would save map/screen
 space and would visually more pleasing.

 If you have funds available - please consider hiring a developer.


I can try to put this requests in my next commitment to qgis developers.




-

 Regarding the second issue: this may be a bug. Or in extreme cases - if
 you have many points at a single location - the circle could be so big
 that it is rendered outside of the visible rendered map area.

 I am also a user of the point-displacement renderer - so I would like to
 see improvments in this feature!


I noticed this bug also with 2 point and a small circle. I can investigate
deeper and try it also with 2.0 qgis version.


Thank you for bringing this up.


Thanks to you Andreas
Luca
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[Qgis-developer] Open custom form from another form

[Luca Lanteri]

Hi to all,

I need a help from a python guru. I'm trying to move my first steps with
pyqgis.

I've got two qgis layer with a 1 to many relation. I create a custom form
for the parent layer with a QTableWidget that contain the primary key of
the child layer. Now I want to open another custom form with the data of
the child record selected into the QTableWidget. I try to look up into the
QGIS API Documentation but I'didn't find the solution to my problem.

Now I just can open form with this code, connected with a button:

path = os.path.dirname( os.path.abspath( __file__ ) )
uifile = os.path.join(path , my_form.ui')
window = uic.loadUi(uifile)
window.exec_()

how can I connect my form with the right data ?
Can I use some method to select the right layer/record and open it in the
form ?

Thanks in advance for any tips

Luca
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Re: [Qgis-developer] Open custom form from another form

[Luca Lanteri]

Hi denis,
thanks a lot for the tip,I'll try it immediately.

I know the brand new 1 to many feature present in qgis 2.1 and it's
gorgeous, but as I know it works only with autogenerate forms, but I need
to use a custom forn because I have some code into it.

many thanks
Luca



2014/1/14 Denis Rouzaud denis.rouz...@gmail.com

  Hi Luca,

 The best way to do this, is to set your personnally designed UI file in
 the layer properties-field properties-attribute editor layout-provide ui
 file

 Then, you want to call qgis method to show a feature form:

 http://qgis.org/api/classQgisInterface.html#aff2467aa3cefd8fc5b59213f385b7180

 And you would need some processing to show it:
 1. get feature id from the selected line
 2. fetch the feature of the main layer
 3. get the foreign key from one of its fields
 4. fetch the corresponding feature
 4. show the feature form with it


 Anyway, if I understand properly, you're trying to do something which has
 been recently added to QGIS (it's in the master version), it's 1:n
 relations.
 See here for more info:
 http://blog.vitu.ch/10112013-1201/qgis-relations

 Cheers,

 Denis


 On 14. 01. 14 16:50, Luca Lanteri wrote:

 Hi to all,

  I need a help from a python guru. I'm trying to move my first steps with
 pyqgis.

  I've got two qgis layer with a 1 to many relation. I create a custom
 form for the parent layer with a QTableWidget that contain the primary key
 of the child layer. Now I want to open another custom form with the data of
 the child record selected into the QTableWidget. I try to look up into the
 QGIS API Documentation but I'didn't find the solution to my problem.

  Now I just can open form with this code, connected with a button:

  path = os.path.dirname( os.path.abspath( __file__ ) )
 uifile = os.path.join(path , my_form.ui')
  window = uic.loadUi(uifile)
 window.exec_()

  how can I connect my form with the right data ?
 Can I use some method to select the right layer/record and open it in the
 form ?

  Thanks in advance for any tips

  Luca


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Re: [Qgis-developer] Open custom form from another form

[Luca Lanteri]

yeah !
IMHO the 1 to many feature is one of the best improvement of the 2.1 qgis
version. It solve to me a lot of work's problem.
Qgis Rulez!

I tried your tips and now all works fine.
Usually the problem for me is moving into API class reference. I need to
study it deeply.
Thanks a lot

Luca


2014/1/14 Denis Rouzaud denis.rouz...@gmail.com

  Hi Luca,

 Since two months, it does support custom ui form [0]

 You have to place a widget in your form and a dynamic property to the
 widget.
 You call it qgisRelation and set it to the id of the relation.

 Cheers,

 Denis

 [0]
 https://github.com/qgis/QGIS/commit/08b43aadd19414d267f86082f7d865f3abc179d1



 On 14. 01. 14 17:09, Luca Lanteri wrote:

 Hi denis,
 thanks a lot for the tip,I'll try it immediately.

  I know the brand new 1 to many feature present in qgis 2.1 and it's
 gorgeous, but as I know it works only with autogenerate forms, but I need
 to use a custom forn because I have some code into it.

   many thanks
 Luca



 2014/1/14 Denis Rouzaud denis.rouz...@gmail.com

  Hi Luca,

 The best way to do this, is to set your personnally designed UI file in
 the layer properties-field properties-attribute editor layout-provide ui
 file

 Then, you want to call qgis method to show a feature form:

 http://qgis.org/api/classQgisInterface.html#aff2467aa3cefd8fc5b59213f385b7180

 And you would need some processing to show it:
 1. get feature id from the selected line
 2. fetch the feature of the main layer
 3. get the foreign key from one of its fields
 4. fetch the corresponding feature
 4. show the feature form with it


 Anyway, if I understand properly, you're trying to do something which has
 been recently added to QGIS (it's in the master version), it's 1:n
 relations.
 See here for more info:
 http://blog.vitu.ch/10112013-1201/qgis-relations

 Cheers,

 Denis


 On 14. 01. 14 16:50, Luca Lanteri wrote:

  Hi to all,

  I need a help from a python guru. I'm trying to move my first steps
 with pyqgis.

  I've got two qgis layer with a 1 to many relation. I create a custom
 form for the parent layer with a QTableWidget that contain the primary key
 of the child layer. Now I want to open another custom form with the data of
 the child record selected into the QTableWidget. I try to look up into the
 QGIS API Documentation but I'didn't find the solution to my problem.

  Now I just can open form with this code, connected with a button:

  path = os.path.dirname( os.path.abspath( __file__ ) )
 uifile = os.path.join(path , my_form.ui')
  window = uic.loadUi(uifile)
 window.exec_()

  how can I connect my form with the right data ?
 Can I use some method to select the right layer/record and open it in the
 form ?

  Thanks in advance for any tips

  Luca


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Re: [Qgis-developer] problem with forms and python init

[Luca Lanteri]

Hi Enzo,

I return to this old discussion because I noticed that the problem that I
described still remain the same when I use Qgis 2.0. On the contrary when I
use Qgis 2.1 all works fine.
I didn't  full understand this problem previously  because I use qgis 2.0
on my works PC and and 2.1 with linux on my laptop.

Anyway I resolve the problem whit Qgis 2.0 using your tip of QgsFeatureRequest
with NoGeometry flag, so the mail is just to keep track of the problem.

thanks again.
Luca


2013/12/21 Luca Lanteri mesca...@gmail.com

 you are right, the code now works fine.
 It was just my fault due to to the fact that I'm trying to take ones
 first steps with pygis !

 thanks for the support and sorry for the noise.

 Btw I also resolve my second problem described in the first mail.

 thanks
 Luca

 2013/12/21 Enzo Ciarmoli enzo.ciarm...@csi.it:
   nevertheless the problem remain the same: if i try to load the data
   from a table without geometry, values for i.attributes()[1] remain
   empty.
 
  Hi Luca,
  I tried your sample code and it works... I don't know what's wrong in
 your
  situation...
 
  If your problem remain the same,
  I could suggest you to use QgsFeatureRequest with NoGeometry flag
 
  (see Detailed Description in:
  http://www.qgis.org/api/classQgsFeatureRequest.html )
 
  Example:
  layer = QgsMapLayerRegistry.instance().mapLayersByName('your_table')[0]
  iter =
 
 layer.getFeatures(QgsFeatureRequest().setFlags(QgsFeatureRequest.NoGeometry))
 
  for feat in iter:
  print feat.attributes()
  print feat.attributes()[0]
  print feat.attributes()[1]
 
 
  Ciao!
 
  Enzo

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Re: [Qgis-developer] problem with forms and python init function

[Luca Lanteri]

Thanks Nathan, your code is decisively more clearer !

 nevertheless the problem remain  the same: if i try to load the data
from a table without geometry, values for i.attributes()[1] remain
empty.

Luca

2013/12/20 Nathan Woodrow madman...@gmail.com:
 Hey Luca,

 If all you want to do is load the attributes for a column from layer you can
 just do this:

 layer = QgsMapLayerRegistry.instance().mapLayersByName('yourname')[0]

 for feature in layer.getFeatures():
  combo.addItem(feature['columnname'])

 That will loop all the features and load the value from columnname into the
 combo.  You will have to add more smarts to that if you need more logic.

 If you are in your initFunction you already have the layer:

 def init(dialog, feature, layer):
   for feature in layer.getFeatures():
 .

 Nathan


 On Fri, Dec 20, 2013 at 10:03 PM, Luca Lanteri mesca...@gmail.com wrote:

 Hi to all,

 I'm a newbie with pyqgis so apologize me for the trivial question. I'm
 trying to create a forms using QT and to add some intelligence into it
 using the python Init function, present in the Layer properties -
 field menu. I want to update the data in combo2 on the base of the
 combo1 choosed value, but I encountered some problem, probably due to
 my lack of knowled of QGIS API. This is my first problems:

 I try to read some data from a layer using this code [1]. If the layer
 is a geometry layer all works fine but if I try to read the data from
 a table (without geom coloumn) i cant read the attributes. Both object
 are QgsVectorLayer so I though that I can use the same methods. In
 order to resolve this problem i just addes a geom coloum to my table
 but it's just a ploy.

 The second, and the very real problem, is that when I try to update
 the the value using the
 curLayer.changeAttributeValue() method some strange beaviours occours.
 - If i try to commit changes from the code (using
 curLayer.commitChanges() ), and I'm in the table form view, Qgis
 crash.
 - when I try to commit changes use the toogle editing mode button, and
 I'm in the table form view, all my changes are lost.
 - when I try to commit changes use the toogle editing mode button, and
 I'm just in the form view, changes are lost alternatively once on two
 saving operation.

 I don't understand if this is a problem of my code or a qgis bug.
 Any hint ?

 I hope to have described the problem clearly.
 thank in advance

 Luca


 [1]
 alegend = iface.legendInterface()
 allLayers=alegend.layers()
 for i in allLayers:
 if i.name()=='mytab':
 aLayer=i
 lista=[]
 rsTipo=[]
 for i in afeature:
 a=i.attributes()
 l1=i.attributes()[0]
 l2=i.attributes()[1]
 l3=i.attributes()[2]
 l4=i.attributes()[3]
 alist=[l1,l2,l3,l4]
 rsTipo.append(alist)
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Re: [Qgis-developer] problem with forms and python init

[Luca Lanteri]

you are right, the code now works fine.
It was just my fault due to to the fact that I'm trying to take ones
first steps with pygis !

thanks for the support and sorry for the noise.

Btw I also resolve my second problem described in the first mail.

thanks
Luca

2013/12/21 Enzo Ciarmoli enzo.ciarm...@csi.it:
  nevertheless the problem remain the same: if i try to load the data
  from a table without geometry, values for i.attributes()[1] remain
  empty.

 Hi Luca,
 I tried your sample code and it works... I don't know what's wrong in your
 situation...

 If your problem remain the same,
 I could suggest you to use QgsFeatureRequest with NoGeometry flag

 (see Detailed Description in:
 http://www.qgis.org/api/classQgsFeatureRequest.html )

 Example:
 layer = QgsMapLayerRegistry.instance().mapLayersByName('your_table')[0]
 iter =
 layer.getFeatures(QgsFeatureRequest().setFlags(QgsFeatureRequest.NoGeometry))

 for feat in iter:
 print feat.attributes()
 print feat.attributes()[0]
 print feat.attributes()[1]


 Ciao!

 Enzo
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Re: [Qgis-developer] Open a form of a linked table

[Luca Lanteri]

Hi Andreas,

which are the difference from the standard editing forms ?
are there some new features ?
The first useful thing I saw is that I can copy the attribute without go in
start editing mode.

thanks

2013/6/5 Bernhard Ströbl bernhard.stro...@jena.de

 Andreas,

 you can try my new plugin DataDrivenInputMask (tables need to be in
 PostgreSql database, though)
 It is not accepted yet (it's been waiting for almost a month now) but you
 can check it out from github [1]

 Bernhard

 [1] 
 https://github.com/bstroebl/**DataDrivenInputMaskhttps://github.com/bstroebl/DataDrivenInputMask

 Am 04.06.2013 16:44, schrieb Andreas Neumann:

 Hi,

 I have two tables with a 1:n to relation from table A to B.

 In the form of table B I want to display a button that opens the
 corresponding record in a form of table A (in a separate window).

 I know that Matthias Kuhn is working on such functionality for QGIS 2.1
 - but I would need a script-based solution now - this project cannot
 wait for QGIS 2.1

 Does someone have a python script that does something like that or
 similar things?

 The idea is to have a Python action with a few lines of code that does
 this and can be associated to a button.

 Thanks,
 Andreas
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Re: [Qgis-developer] adding symbols

[Luca Lanteri]

We have produced a complete set of geological symbols [0] that follow
the american FDCG standard and the Italian CARG/ISPRA standard.
It would be nice to add them to the future repository.

[0] https://code.google.com/p/gissymbology/downloads/list


2013/6/3 Andreas Neumann a.neum...@carto.net:
 Hi,

 ok - good. I would be available to discuss things and test the work.

 I would propose to delay adding more SVG symbols to the main QGIS
 project until Arun's work is done (QGIS 2.1 or 2.0x) and users can
 selectively check out certain symbol groups/topics.

 Having symbols immediately at hand is not critical for QGIS adoption and
 adding symbols manually is relatively easy.

 Andreas
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Re: [Qgis-developer] serious regression out of new vector api needs attention prior to 2.0

[Luca Lanteri]

It's a known and very annoying bug.
Issue was already reported in:
http://hub.qgis.org/issues/7321
http://hub.qgis.org/issues/7472



2013/4/23 Mathieu Pellerin nirvn.a...@gmail.com

 Greetings,

 I've filed an issue over the weekend which IMO is a really serious
 regression which shouldn't be left unresolved prior to the imminent
 2.0 release.

 Long story short, when a layer symbology is set to categorized,
 graduated, or rule-based, all features will disappear when editing
 feature(s) on that layer (by moving feature or one of its vertex). If
 the user then leave the edit mode (saving changes or not), all
 features will reappear.

 When features disappear, an error pops up in the log window saying
 Already active iterator on this provider was closed.

 Data itself is not impacted, but it's a super scary behavior for the
 average user. It got me to cancel edits many, many times before I
 understood what was happening.

 Issue filed can be reached here: http://hub.qgis.org/issues/7660

 Mathieu
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Re: [Qgis-developer] Print composer legend group removal problem

[Luca Lanteri]

Yes, I confirm the problem with Win7 QGIS 1.9 (93ade1f)
did you have already open a ticket ?

2013/3/28 Ramon Andiñach cust...@westnet.com.au:
 Hi,

 Today I needed to remove a subgroup of items from a legend in a print 
 composer.
  I selected the layer title from the list, clicked the minus button and the 
 subgroup and next subgroup below are removed.

 Can anyone confirm this?

 Win7 QGIS 1.9 (87265c7)
 -ramon.
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