Re: Filtering within a ModelForm

Does anyone have a hint for this (or an idea of where to get started in
the documentation)? This seems relatively simple so my best guess is
that there is something that I am just missing.

Thanks!
-- Casey

On 07/22/2010 10:16 AM, Casey S. Greene wrote:
> I am trying to figure out a reasonable way to filter using a queryset
> within a ModelForm.
>
> In a simple example, I have three models (A, B, and C).
> C has many A and B
> A and B have a many to many relationship.
>
> Assume that some instances of C and instances of B already exist.
>
> I am using the create_object generic view to allow users to create
> instances of A but not to select associated Bs. I'm then using
> update_object generic view to allow users to select the Bs associated
> with A. I've created a class that inherits from forms.ModelForm that
> defines the form. In that I have forms.ModelMultipleChoiceField() for
> selecting associated Bs. What I want to do is use the queryset to filter
> to only show those Bs that share C with this instance of A.
>
> I am confused as to how to do this type of query while passing a
> form_class from the update_object generic view.
>
> I have tried doing this in __init__() but I get a TypeError that the
> form is not callable when I try to pass arguments.
>
> Thanks in advance for your help and time,
> -- Casey
>

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