CODEWITHSUNDEEP
djangodjango-forms
talkingtoaj
talkingtoaj

Reputation: 888

What are form factories and when should they be used?

Would someone like to attempt a succinct explanation of what a form_factory, or a modelform_factory is in relation to a form / modelform?

Upvotes: 2

Views: 2376

Answers (1)

Alasdair
Alasdair

Reputation: 308799

The modelform_factory method is a method that returns a ModelForm class. Here's an example of why it's useful.

If you have a simple view that uses a form for a single model, then there is no need for a factory, you can simply define the form:

class ProductForm(forms.ModelForm):
    class Meta:
        model = Product

def add_product_view(request):
    form = ProductForm()
    ...

However, if your view needs to handle multiple models, then you might not want to have to define a form class for every model. The modelform_factory lets you create the form class dynamically. 

apps.get_model('newapp', 'mymodel')

def add_model_view(request, model_name):
    Model = apps.get_model('myapp', model_name)
    Form = modelform_factory(Model)

The Django admin uses modelform_factory to generate model form classes dynamically. This means you don't need to define a model form every time you register a model in the Django admin.

Upvotes: 3

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