Changed paths:
M django/db/models/fields/related.py
M docs/ref/checks.txt
M tests/invalid_models_tests/test_relative_fields.py
Log Message:
-----------
Fixed #22064 -- Add check for related_name
Validates that related_name is a valid Python id or ends with a '+' and
it's not a keyword. Without a check it passed silently leading to
unpredictable problems.