Diego Woitasen schrieb:
> On Tue, May 26, 2009 11:49 am, Diez B. Roggisch wrote:
>> On Tuesday 26 May 2009 16:04:09 Diego Woitasen wrote:
>>> On Tue, May 26, 2009 6:50 am, Diez B. Roggisch wrote:
>>>> On Tuesday 26 May 2009 03:28:14 Diego Woitasen wrote:
>>>>> Hi,
>>>>> I want to write a reusable form using TableForm as base class. I
>>> tried
>>>>> with this:
>>>>>
>>>>> class RuleForm(TableForm):
>>>>> def __init__(self, id=None, parent=None, children=[],
>>> host_filter=[],
>>>>> **kw):
>>>>> super(RuleForm, self).__init__(id,parent,children, **kw)
> self.fields = [
>>>>> TextField(id = 'description', label = 'Description'),
>>>>> ]
>>>>>
>>>>> and this:
>>>>>
>>>>> class RuleForm(TableForm):
>>>>> def __init__(self, id=None, parent=None, children=[],
>>> host_filter=[],
>>>>> **kw):
>>>>> children = [
>>>>> TextField(id = 'description', label = 'Description'),
>>>>> ]
>>>>> super(RuleForm, self).__init__(id,parent,children, **kw)
>>>>>
>>>>> without sucess.
>>>> What does "without success" mean? You are aware, that in the latter
> example
>>>> you simply override whatever children are passed?
>>>>
>>>> Besides, the simple problem of yours seems to be solvable using
>>>>
>>>>
>>>> common_widgets = [...] # list of widgets
>>>>
>>>> some_form = Form(children = common_widgets + some_other_widgets]
>>>>
>>>> Diez
>>> Means, it doesn't work. If I use fields outside the constructor works, for
>>> example:
>>> class RuleForm(TableForm):
>>> fields = [
>>> TextField(id = 'description', label = 'Description'),
>>> ]
>>> def __init__(self, id=None, parent=None, children=[], host_filter=[],
>>> **kw):
>>> super(RuleForm, self).__init__(id,parent,children, **kw)
>>> That works, but I need fields inside the constructor because I want to use
>>> SelectionList or CheckboxList which contents could change in each use
> of
>>> RuleForm (quering data from database).
>> This is not intended to work. ToscaWidgets are instantiated once, and
> re-used.
>> To make selectfields display varying values, use a callable as
>> options-parameter.
>>
>> def get_options():
>> return some_options
>>
>>
>> class MyForm(TableForm):
>> class fields(WidgetList):
>> select_field = SingleSelectField(options=get_options)
>>
>>
>> Diez
>>
>
> I got "TypeError: 'function' object is not iterable".
Full stacktrace please, and code.... crystal-ball time is over for this
month.
This works in our codebase, so the problem must be on your side:
def get_users():
"""
This function returns a list of tuples
(User, str)
to be used as options for a SingleSelectField.
It is important to work with **User**-objects here,
**not** with ids! Otherwise in case of a failed
validation, the display of the SingleSelectField
wouldn't show the last selected value.
"""
return [(u, u.email) for u in User.query()[:10]]
model_select_form = ListForm("model_select_form",
action="model_select_field_action",
fields=[SingleSelectField("user",
options=get_users,
validator=ModelValidator(User)),
TextField("leave_me_empty",
validator=NotEmpty()),
])
> Anyway, I don't like that approach. What if a want to pass parameters to
> get_options()? I want to pass a SQLAlchemy query when the form is
> instantiated to condition the data to be returned i select fields.
>
> I think the solution at the moment is to write a function that return all
> childrens to pass to my form but I don't like it.
There are various ways to overcome this. You can use the tmpl_context to
pass the query.
def get_options():
return tmpl_context.some_options
# in the controller
@expose()
def my_action(self, ...):
tmlp_context.some_options = my_query
return ...
It should also be possible to do something like this (in the template):
${my_form.display(value, dict(options=dict(select_field=the_query)))}
Diez
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