Hi, please take a look at the following code.
def create_foo_form(baz):
class FooForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
print "Initializing a FooForm object"
# Init stuff here
return FooForm
class FooInline(admin.TabularInline):
model = Foo
def get_formset(self, request, obj=None, **kwargs):
if obj:
kwargs['form'] = create_foo_form(obj)
return super(FooInline, self).get_formset(request, obj,
**kwargs)
class BazAdmin(admin.ModelAdmin):
inlines = [FooInline,]
Suppose we are changing a Baz object. First, get_formset method will
be passed the Baz object as obj and following that a FooForm class
will be created and passed to the superclass method.
Here's the part that's beyond my understanding: After that,
get_formset gets executed for an extra time with obj=None. Because obj
is None, the method doesn't pass FooForm to the superclass method, and
therefore the superclass is expected to construct the formset using
default form (self.form - which is not FooForm). But to my surprise I
am getting FooForm objects initialized.
So I have 2 questions:
1. Why does get_formset get called an extra time with obj=None?
2. Why are FooForm objects used when a formset is constructed in this
second time?
Regards.
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