ModelFormset Into InlineFormset

[Matthew Pava]

I have a class CustomFormSet that inherits from BaseModelFormSet.  I would like to have another formset class that does everything CustomFormSet does but instead inherits from BaseInlineFormSet.  What is the best pythonic/Django way of doing that?

 

[James Schneider]

On Wed, May 31, 2017 at 3:13 PM, Matthew Pava <Matthe...@iss.com> wrote:

I have a class CustomFormSet that inherits from BaseModelFormSet.  I would like to have another formset class that does everything CustomFormSet does but instead inherits from BaseInlineFormSet.  What is the best pythonic/Django way of doing that?

 

I would take the same approach that abstract model classes use. Collect the common functionality into a separate class, and mix the forms together with the desired inheritance hierarchy.

Since your inheritance hierarchy includes the Base*FormSet classes, your abstract form mixin can simply inherit from object to keep from adding unintended behavior. 

-James  

[Matthew Pava]

Well, that took me on a path to enlightenment.  I learned quite a bit more about method resolution order, MRO.  On my journey, I also learned the new way of using super() in python 3.  I even stumbled upon type checking using mypy.  And I learned that there are stub files available for Django with mypy.

 

Unfortunately, my CustomModelFormSet still does not work with one particular form/view.  It works in other form/views, though, so there’s a problem elsewhere to resolve.

 

Thank you for your insight, James!  It was most helpful!

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[James Schneider]

On Thu, Jun 1, 2017 at 1:34 PM, Matthew Pava <Matthe...@iss.com> wrote:

Well, that took me on a path to enlightenment.  I learned quite a bit more about method resolution order, MRO.  On my journey, I also learned the new way of using super() in python 3.  I even stumbled upon type checking using mypy.  And I learned that there are stub files available for Django with mypy.

 

Unfortunately, my CustomModelFormSet still does not work with one particular form/view.  It works in other form/views, though, so there’s a problem elsewhere to resolve.

 

Thank you for your insight, James!  It was most helpful!

Good to hear! I sometimes wonder if I'm actually helping people on this list. I've been wrong more than once. ;-)

Post up the problem view with a description of the problem in a separate thread and maybe someone can help you out. I haven't needed to work with form sets so I don't have any general nuggets of wisdom.

-James