how to access the parent instance from the Inline model admin?

[Michael]

How can I access the parent instance from the inline model admin?

My goal is to allow to add a child object only when the status of the parent is equal to 1 so I'm trying to override the `has_add_permission` function based on the status of the parent instance but I cannot get the parent instance. 

Is there another way to do this?

    class ChildInline(admin.TabularInline):
        model = Child
        form = ChildForm
   
        fields = (
            ...
        )
        extra = 0
   
        def has_add_permission(self, request):
            # Return True only if the parent has status == 1
            # How to get to the parent instance?
            #return True
   
    class ParentAdmin(admin.ModelAdmin):
        inlines = [ChildInline,]

[Gergely Polonkai]

Whose parent do you want to get? The inline, the model, or, less likely, the form?

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[Michael]

I'd like to get the model instance of the Parent admin.