One possible way seems to override the render_change_form in
AdminClass as pointed in this post:
http://groups.google.com/group/django-users/browse_thread/thread/94bdf5d7eeefc99b/9cbdb25672387c33?lnk=gst&q=select+foreign+key+list#9cbdb25672387c33
On Jan 12, 8:34 pm, GuyBowden <guy.bow...@gmail.com> wrote:
> Hi,
>
> I am writing a resource booking system in django using the admin
> functionality.
>
> I have a "Booking" model, a "ResourceType" model, and a "Resource"
> model.
>
> The booking model has date from and to fields, aforeignkeyfield toselectthe
> ResourceType, and a ManyToManyField to link to the Resource
> model.
>
> I would like the user to be able to enter the dates to and from, andselectthe
> resource type. Then from these choices this would only show
> those resources available that belong to the specific resource type.
>
> I have defined an "is_available" method on the Resource, and am able
> to pass to and from dates and return True/False if they are available.
>
> My problem is updating the form with this limited set of Resources to
> choose from.
>
> I am happy to press "Save and continue editing" in order to process
> the dates (no need for ajax)
>
> My question is how to get the dates and resource type in to my form
> Model and then into the admin....
>
> Any pointers as to how to do this?
>
> My attempt below - fails :(
>
> class BookingAdminForm(forms.ModelForm):
>
> def __init__(self, *args, **kwargs):
> super(BookingAdminForm, self).__init__(*args, **kwargs)
>
> if self.is_valid():
> resourcesChoices =
> self.getAvailableResources(self.cleaned_data
> ['booked_from'], self.cleaned_data['booked_until'])
> self.fields['resources'] = forms.MultipleChoiceField
> (choices=resourcesChoices)
> else:
> pass
> #del self.fields['resources']
>
> def getAvailableResources(self, booked_from, booked_until):
> allResources = Resource.objects.all()
> choices = ((0,'none',),)
> for resource in allResources:
> if resource.is_available(booked_from, booked_until):
> choices += ((resource.id, resource.name,),)
> return choices
>
> class Meta:
> model = Booking
>
> class BookingAdmin(admin.ModelAdmin):
> list_display = ('customer',
> 'resource_type','number_of_resources','booked_from','booked_until',)
> list_filter = ('resource_type', 'created_on',)
> date_hierarchy = 'booked_from'
> search_fields = ['group_leader']
> filter_horizontal = ('resources',)
> form = BookingAdminForm
>
> inlines = [NoteInline]
> save_on_top = True
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