Cluster model user_id definition

[obijuan-kenobi]

If you follow a cluster link on the analytics page, the web app produces an error:

django.db.utils.ProgrammingError: operator does not exist: character varying = integer
LINE 1: ...lytics_rating" WHERE "analytics_rating"."user_id" IN (SELECT...
                                                             ^
HINT:  No operator matches the given name and argument types. You might need to add explicit type casts.

I tracked the issue to the analytics.cluster.user_id definition, which should be:
user_id = models.CharField(max_length=16) << not 'integer'

[Heermosi]

I've fixed this, same.
Either can you turn it to integer or turn it to char field.
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Which means you've fully understood the content of the book.