In Postgraphile How Do I Update/Delete a JOIN Table?

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I am using Postgraphile (with the many-to-many plugin) with three tables: foos, bars, and foo_bars. foo_bars is a simple join table with foo_id and bar_id columns, which have foreign key constraints to the corresponding table.

When I look at GraphiQL I can see that there is a createFooBar mutation, which let's me create a record in that JOIN table. However, once I create a record, there appears to be no way to remove or change it, as there is no updateFooBar or deleteFooBar mutation, and neither the updateFoo or updateBar mutations seem to have a way to affect foo_bar.

So, simple question: how do I change JOIN table records in Postgraphile?

P.S. The relevant documentation page, https://www.graphile.org/postgraphile/relations/, doesn't offer any help.

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1 Answers

When the update/delete mutations are missing on a table (join or otherwise) the most common reason is that there is no primary key or unique constraints on the table. Try adding a primary key to your table then restarting PostGraphile.

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