About Dynamic Admin Inline Extras
Django inlines have a parameter extra which defines how many empty inline forms to show below the main form.
You can define the parameter dynamically using get_extra() method:
class AttachmentInline(admin.StackedInline):
model = Attachment
def get_extra(self, request, obj=None, **kwargs):
return 0 if obj and obj.attachment_set.exists() else 1
In our example, one empty inline Attachment form will be shown if no attachments exist yet.
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