ModelChoiceField help

[Bobby Roberts]

Hi Group. Please look at this snippet from my forms. It uses two
ModelChoiceFields as shown below. Each database table currently has 2
records.

On the webpage, when the form is being called, the options are like
this:

Template object
Template object

and

PageCategory object
PageCategory object

The values of the options are correct, but how do i get the correct
visible text in the drop box

from django import forms
from web_pages.models import PageCategory
from template_manager.models import Template

class FrmWebPage (forms.Form):
page_category_id = forms.ModelChoiceField
(queryset=PageCategory.objects, empty_label='Choose',required=True,
widget=forms.Select(attrs={'class':'dropbox'}))

template_id=forms.ModelChoiceField
(queryset=Template.objects,required=True,
empty_label='Choose',widget=forms.Select(attrs={'class':'dropbox'}))


def clean_page_category_id(self):
data=self.cleaned_data['page_category_id']
return data

def clean_template_id(self):
data=self.cleaned_data['template_id']
return data

[Alex Gaynor]

Take a look at label_from_instance: http://docs.djangoproject.com/en/dev/ref/forms/fields/#modelchoicefield

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

[Bobby Roberts]

> Take a look at label_from_instance:http://docs.djangoproject.com/en/dev/ref/forms/fields/#modelchoicefield
>
> Alex
>

yeah I'm lookin at that but it makes no sense to me.

Here's what i have and it's not working:

from django import forms
from web_pages.models import PageCategory
from template_manager.models import Template

class FrmWebPage (forms.Form):
page_category_id = forms.ModelChoiceField
(queryset=PageCategory.objects, empty_label='Choose',required=True,
widget=forms.Select(attrs={'class':'dropbox'}))

template_id=forms.ModelChoiceField
(queryset=Template.objects,required=True,
empty_label='Choose',widget=forms.Select(attrs={'class':'dropbox'}))

class MyModelChoiceField (page_category_id):
def label_from_instance(self,obj):
return "My Object #%i" % obj.id

[Alex Gaynor]

You aren't actually using that Field though, you need to use it in place of ModelChoiceField where you want that behavior.

[Bobby Roberts]

> You aren't actually using that Field though, you need to use it in place of
> ModelChoiceField where you want that behavior.
>
> Alex

here's what i've got:

class FrmWebPage (forms.Form):
active = forms.ChoiceField(required=True, choices=active_choices,
widget=forms.RadioSelect(attrs={'class':'choiceselect'}))
page_category_id = forms.MyModelChoiceField

(queryset=PageCategory.objects, empty_label='Choose',required=True,
widget=forms.Select(attrs={'class':'dropbox'}))

on_rss = forms.ChoiceField(required=True, choices=active_choices,
widget=forms.RadioSelect(attrs={'class':'choiceselect'}))

tags=forms.CharField(max_length=254, required=False,
widget=forms.TextInput(attrs={'class':'reallylargetextbox'}))
url_slug = forms.SlugField (max_length=254, required=True,
widget=forms.TextInput(attrs={'class':'reallylargetextbox'}))
blurb = forms.CharField(max_length=254, required=False,
widget=forms.Textarea(attrs={'class':'mediumblob'}))

page_weight = forms.ChoiceField(required=True,
choices=weight_choices, widget=forms.Select(attrs=
{'class':'dropbox'}))
browser_title = forms.CharField(max_length=254, required=True,
widget=forms.TextInput(attrs={'class':'reallylargetextbox'}))
meta_keywords = forms.CharField(max_length=254, required=False,
widget=forms.TextInput(attrs={'class':'reallylargetextbox'}))
meta_description = forms.CharField(max_length=254, required=False,
widget=forms.TextInput(attrs={'class':'reallylargetextbox'}))

template_id=forms.ModelChoiceField
(queryset=Template.objects,required=True,
empty_label='Choose',widget=forms.Select(attrs={'class':'dropbox'}))

body = forms.CharField (required=True,widget=forms.Textarea(attrs=
{'cols':107,'rows':30}))

class MyModelChoiceField (page_category_id):
def label_from_instance(self,obj):
return "My Object #%i" % obj.id

When i run it, i get this traceback:

Error was: 'module' object has no attribute 'MyModelChoiceField'

any ideas? The docs aren't very helpful to someone new to python

[Alex Gaynor]

You don't access the class at forms.MyModeChoiceField, since it doesn't live in that namespace.  You access it with just MyModelChocieField, since it's defined in the same file.  As a note, you're going to want to have the MyModelChoiceField class before your form (in the file), otherwise the Field won't be defined when you go to use it.

[Bobby Roberts]

> You don't access the class at forms.MyModeChoiceField, since it doesn't live
> in that namespace.  You access it with just MyModelChocieField, since it's
> defined in the same file.  As a note, you're going to want to have the
> MyModelChoiceField class before your form (in the file), otherwise the Field
> won't be defined when you go to use it.
>
> Alex

Alex -

I really appreciate your help. I made the changes you suggested and
it's shown here:

class MyModelChoiceField (ModelChoiceField):

def label_from_instance(self,obj):
return "My Object #%i" % obj.id

class FrmWebPage (forms.Form):
active = forms.ChoiceField(required=True, choices=active_choices,
widget=forms.RadioSelect(attrs={'class':'choiceselect'}))

page_category_id = MyModelChoiceField

(queryset=PageCategory.objects, empty_label='Choose',required=True,
widget=forms.Select(attrs={'class':'dropbox'}))

[snip]

page_weight = MyModelChoiceField(required=True,

choices=weight_choices, widget=forms.Select(attrs=
{'class':'dropbox'}))

and the result is:

name 'ModelChoiceField' is not defined

[Alex Gaynor]

Your class should inherit from "forms.ModelChoiceField", not just ModelChocieField.

[Bobby Roberts]

> Your class should inherit from "forms.ModelChoiceField", not just
> ModelChocieField.
>
> Alex

Ok i'm getting somewhere! Thanks for your patience. I'm still
finding my python / django legs. This populates the dropbox with

My Object #1
My Object #2
My Object #3

I see why it's dong that in the override class but is there a way to
pull a field value from the database and put it in there?

In other words in my table i have:

id
url
name

i'm looking for a way to make the select like such:

<select>
<option value="1">Wide Template</option>
<option value="2">Home Page</option>
<option value="3">Eblast July 4</option>
</select>

where the option value is the id field and the visible text is the
name fiel

[Alex Gaynor]

Sure, label_for_instance gets the object itself, with all it's fields.  So isntead of returning the string with the id number, change it to return: obj.name.

[Bobby Roberts]

> Sure, label_for_instance gets the object itself, with all it's fields.  So
> isntead of returning the string with the id number, change it to return:
> obj.name.
>
> Alex

PERFECT! Thanks a lot!