Hi Nicholas, I haven't had time to dig into this extensively or encountered this particular issue, but I would suggest trying to "force" the expression to retrieve the correct info regardless of context using something like this:
with_variable('Length2', to_string(@NamelengthField) || '2', if(attribute(to_string(@NamelengthField)) != attribute(@Length2), TRUE, FALSE)) That's probably an extreme example but hopefully it illustrates my point. If you want to share a sample dataset/ model I can try to have a look at how to resolve it. Regards On Tue, 20 Jul 2021 at 10:46, Richard McDonnell <richard.mcdonn...@opw.ie> wrote: > Nicolas, > > I have not looked at this in too much detail, but at a quick glance, could > it not be the fact that you should be using the newly created fields? As in > instead of *@NamelengthField != @NamelengthField || '2'*, should it not > be more like your previous example *Length != Length2* > > > > Regards, > > > > Richard > > > > > > —— > Richard McDonnell MSc GIS, FME Certified Professional > *FRM Data Management* > > —— > Oifig na nOibreacha Poiblí > Office of Public Works > > Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36 > Jonathan Swift Street, Trim, Co Meath, C15 NX36 > —— > M +353 87 688 5964 T +353 46 942 2409 > https://gov.ie/opw > > —— > To send me files larger than 30MB, please use the link below > https://filetransfer.opw.ie/filedrop/richard.mcdonn...@opw.ie > > Email Disclaimer: > https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/ > > *From:* Qgis-user <qgis-user-boun...@lists.osgeo.org> *On Behalf Of *Nicolas > Cadieux > *Sent:* 20 July 2021 09:27 > *To:* Qgis Users List <qgis-user@lists.osgeo.org> > *Subject:* Re: [Qgis-user] Problem using Model Inputs variable in an > Select by expression in the model Designer > > > > Hi, > > Does anyone have an idea? > > Nicolas Cadieux > > https://gitlab.com/njacadieux > > > > Le 8 juill. 2021 à 01:17, Nicolas Cadieux <njacadieux.git...@gmail.com> a > écrit : > > > > Hi, > > I am creating a model that fixes Network files before they are used in the > QGIS Network analysis (Shortest path) tools. > > This is my work flow: > > 1. Create a "Length" field (value) and calculate $length in the field > calculator > 2. Split the Multipart lines into Singlepart lines > 3. Create a "Length*2*" field (value) and calculate $length in the > field calculator > 4. Select by expression Length != Length2. This basically gives me a > selection of line that have been modified by the Multipart to Singlepart > algorithm. (I get 8 results) > > This works well > > The problem is when I create and Input String to let the user create a > "Length" field. This become a variable called @NamelengthField. My work > flow become: > > 1. User input "Length" in the Model input. (@NamelengthField) > 2. Create a "Length" field using @NamelengthField (as pre-calculated > value) and calculate $length in the field calculator: This is OK > 3. Split the Multipart lines into Singlepart lines: This is OK > 4. Create a "Length2" field using @NamelengthField ||'2' (as > pre-calculated value) and calculate $length in the field calculator: This > is OK this field (Length2) is created and calculated properly. > 5. I get stuck when I try Select by expression using > @NamelengthField != @NamelengthField || '2' (as pre-calculated value) (I > get all lines back) and the test does not work. > > I tried stuff like > > @NamelengthField != (@NamelengthField || '2') > > '@NamelengthField != @NamelengthField || '2'' > > "@NamelengthField != @NamelengthField || '2'" > > "@NamelengthField"|| !=|| "@NamelengthField || '2'" > > Even simple @NamelengthField = 5.286365157529550 (which should extract > exactly one value). > > Any ideas? > > Nicolas > > QGIS 3.18.2 on Windows 10 > > > > > > > > -- > > Nicolas Cadieux > > https://gitlab.com/njacadieux > > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >
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