graphile
feat(pg) single backward relations with arguments if primary key covered partially
Integrating the plugin I had posted on Discord into core.
Basic tests (creates the fields it should, queries work as expected, can be omitted using new @omit single #460) included based on the existing test schema c.
Not sure if separate (smaller) schema is needed to go over all edge cases as well, including renaming and custom inflection?
Does this need to go behind a feature flag? I figured this might break existing schemas that a) have such foreign references on parts of their primary keys and b) have a @foreignFieldName that doesn't properly singularise, leading to a name collision between the "many" backwards relation and the new single-but-parameterised relation.
@ab-pm Thanks for the PR. I'm going to leave this hanging for a while because I want to figure out what I'm doing with the existing core plugins in v5 before extending the codebase further.
