if there's an incompatible foreign_keys collection specified that can also
lead to this error.  the Page and User classes must map the author_id and
id columns normally as well, i.e. no exclude_columns or relations getting
in the way.

Alex Marandon wrote:
>
> Hi there,
>
> Could someone explain me a bit what this error message means and what
> could be causing it:
>
> sqlalchemy.exc.ArgumentError: Could not locate any equated, locally
> mapped column pairs for primaryjoin condition 'pages.author_id =
> users.id' on relation Page.author. For more relaxed rules on join
> conditions, the relation may be marked as viewonly=True.
>
> The tables are created properly with an author_id field on the pages
> table and of course the usual id field on the users table.
>
> Thanks,
> Alex
>
> >
>


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