Pulp

We're seeing this issue in pulp_ansible:

Traceback (most recent call last):
  File "/home/travis/build/pulp/pulp_ansible/pulp_ansible/tests/unit/test_serializers.py", line 41, in test_duplicate_data
    serializer = RoleSerializer(data=self.data, context={"view": view})
  File "/home/travis/build/pulp/pulpcore/pulpcore/app/serializers/content.py", line 49, in __init__
    self.fields["relative_path"].write_only = False
  File "/home/travis/virtualenv/python3.6.7/lib/python3.6/site-packages/rest_framework/utils/serializer_helpers.py", line 148, in __getitem__
    return self.fields[key]
KeyError: 'relative_path'

The problem here[0] is that the Role model in pulp_ansible has a relative_path but it's not on the serializer.

[0] https://github.com/pulp/pulpcore/commit/342f4539c09a7accda7d2ffaaea7666b1dac0463#diff-550358b6baa6118249bdbcfa195fe88dR49