Add a required inline on django admin

[zodman]

For example: If you have a User and UserProfile, you can set up the Admin site to display an inline for the UserProfile.

If the user provides data for the UserProfile, it will be validated and saved.

However, an empty form also passes validation -- there's no easy way to require that the user populate the UserProfile inline.

More details and description ​on Stack Overflow.

I propouse to use some like this:

class ProfileInline(admin.StackedInline):
    """
    Allows profile to be added when creating user
    """
    model = Profile
    extra = 1
    max_num = 1
    formset = RequiredInlineFormSet
    formset_required = True

[Russell Keith-Magee]

In future, please don't use links to external sites like StackOverflow to provide a basic description of the problem you're trying to solve.

[Russell Keith-Magee]

Broadly, I can accept the use case. However, I'm inclined to say that the solution lies in Formsets, not the admin.

[Julien Phalip]

This is essentially a dupe of #14832. That is one tough problem to solve...