#24643: views.generic.edit.FormMixin should have a get_context_data() method
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Reporter: akulakov | Owner: akulakov
Type: Cleanup/optimization | Status: new
Component: Generic views | Version: master
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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Currently SingleObjectMixin and MultipleObjectMixin have get_context_data
but FormMixin does not, instead form is added to context via an argument
in get() method.
The reason for this is probably because it's just one line of code and it
did not seem to warrant a method.
However, it would be really nice to have this method for a few reasons:
1. consistency: FormView, UpdateView, CreateView context gets populated in
the same way as in DetailView and ListView. When GCBVs are customized,
users will know that context is populated in the same place for all views.
2. From the point of view of documentation, it's also easier because you
can tell users where context is created for all views rather than
specifying two different places, especially because you have to explain
that argument to get_context_data gets added to context.
3. Logically, it seems like it should belong to get_context_data(). A user
who is not closely familiar with GCBVs may be confused as to where context
comes from in Form Views. get_context_data() is an unambiguous location
for this logic as indicated by the name.
4. It makes it easier to combine different GCBVs. In case of FormView and
CreateView, you don't need to do anything in get() method (in CreateView
you may simply init self.object=None at class level), therefore when
combining these views with others, you can simply use get() methods from
the other View and let get_context_data() handle contexts of all inherited
views.
There are two alternatives: form initialization may be removed from get()
and post() methods OR it may be left there. In former case it may be a
backwards-incompatible change - although get_context_data() is supposed to
include a super() call to parent get_context_data() methods, users may
have it without the super() call, then form will disappear from context.
If form init is left in get()/post(), it's probably an acceptable
performance cost. Perhaps it can be left in but deprecated.
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Ticket URL: <https://code.djangoproject.com/ticket/24643>
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