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You can do that, but you must also add my_field
to your MyModelInline
class’s readonly_fields
attribute.
fields = ('my_field',)
readonly_fields = ('my_field',)
From the docs:
The fields option, unlike list_display, may only contain names of fields on the model or the form specified by form. It may contain callables only if they are listed in readonly_fields.
If you need the field to be editable, you should be able to do that with a custom form but it takes more work to process it.
Source:stackexchange.com