How to make some Django Inlines Read Only-CodePudding

I'm using django admin and adding a TabularInline to my ModelAdmin class. Think Author and the inline is Books. How do I make some of those inlines appear read only and some appear editable based on certain characteristics of the model instance for each specific inline? Say I wanted all the books written before 2001 to be read only. And all the books written after that to be editable.

I've tried overriding has_change_permission() on the TablularInline and using the obj param, but it is receiving the parent and not the instance of this specific inline.

CodePudding user response：

You have to override your inline form and check the value on the instance in the __init__().

Example:

class AuthorBookInlineForm(forms.ModelForm):
    model = Book

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        if self.instance and self.instance.created_ts.year <= 2001:
            for f in self.fields:
                  self.fields[f].widget.attrs['readonly'] = 'readonly'

Don't forget to set the form value on your inline...

class AuthorBookInline(admin.TabularInline):
    model = Book
    form = AuthorBookInlineForm
    extra = 0