[Answered ]-Django tabularInline 'categories.Category_children_ids' has more than one ForeignKey to 'categories.Category'. You must specify a 'fk_name' attribute

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The value for fk_name has to be the name of the class (lower-case), prefixed with either "from_" or "to_", depending on your needs. So in your case, it has to be either fk_name='from_category' or fk_name='to_category':

class ChildrensInline(admin.TabularInline):
    model = Category.children_ids.through
    fk_name='from_category' # or: 'to_category'

Generally, a quick way to figure such things out is to (transiently) place a simple print(model.__dict__) pretty much anywhere in your code, here e.g. right after the second line. Then all fields of model will be shown in the console output.

👤David S.

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