Re: Add extra field to ModelForm

[Shawn Milochik]

On Jul 11, 2009, at 6:23 PM, adelaide_mike wrote:

>
> Thanks Alex.
>
> A simpler way out would be if the agent field, which is a foreign key
> pick list, could be caused to show only those values I determine
> dynamically.
>
> Is this possible  in a ModelForm?
>
> Mke

If I understand correctly, what would help you is to add that 'agent'  
field to the exclude tuple of your model form and add another  
ChoiceField, setting its 'choices' dynamically in the __init__ of your  
ModelForm.

Something vaguely like this:

class ListingForm(forms.ModelForm):

 agent_id = forms.ChoiceField()

 def __init__(self, *args, **kwargs):
 realtor = kwargs.pop('realtor')
 super(ListingForm, self).__init__(*args, **kwargs)
 agent_choices = [('', '--SELECT AGENT--')] + [(str(x.id),  
x.name) for x in realtor.agent_set.all()]
 self.fields['agent_id'].choices = agent_choices

 class Meta:
 model = Listing
 exclude = ('agent',)


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Re: Add extra field to ModelForm

[adelaide_mike]

Thanks Alex.

A simpler way out would be if the agent field, which is a foreign key
pick list, could be caused to show only those values I determine
dynamically.

Is this possible  in a ModelForm?

Mke

On Jul 12, 12:17 am, Alex Gaynor  wrote:
> On Sat, Jul 11, 2009 at 10:08 AM, adelaide_mike 
>
>
> > wrote:
>
> > Django 1.0.2.  My ModelForm concerns (and is based on the table for)
> > advertisements for houses placed by real estate agents.
>
> > I need the agent widget (which by default is a pick list of all
> > agents), to be modified on the form to be either (depending on
> > circumstances) a non-editable preset display object, or a pick list
> > with a dynamically set choice of two agents.
>
> > So, I need to add extra fields to my ModelForm.  Can this be done?
>
> > Thanks
>
> > Mike
>
> Sure, just define a Field on the ModelForm in the same way you would on a
> regular Form and it will get added to the Form.
>
> Alex
>
> --
> "I disapprove of what you say, but I will defend to the death your right to
> say it." -- Voltaire
> "The people's good is the highest law." -- Cicero
> "Code can always be simpler than you think, but never as simple as you want"
> -- Me
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Re: Add extra field to ModelForm

[Alex Gaynor]

On Sat, Jul 11, 2009 at 10:08 AM, adelaide_mike  wrote:

>
> Django 1.0.2.  My ModelForm concerns (and is based on the table for)
> advertisements for houses placed by real estate agents.
>
> I need the agent widget (which by default is a pick list of all
> agents), to be modified on the form to be either (depending on
> circumstances) a non-editable preset display object, or a pick list
> with a dynamically set choice of two agents.
>
> So, I need to add extra fields to my ModelForm.  Can this be done?
>
> Thanks
>
> Mike
> >
>
Sure, just define a Field on the ModelForm in the same way you would on a
regular Form and it will get added to the Form.

Alex

-- 
"I disapprove of what you say, but I will defend to the death your right to
say it." -- Voltaire
"The people's good is the highest law." -- Cicero
"Code can always be simpler than you think, but never as simple as you want"
-- Me

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