Allow passing explicit policy

[phyrog]

This allows passing of keyword arguments to authorize, so a policy and a record can be overridden individually. Note that this is a breaking change. Where you previously used

authorize :write, Repository
# => RepositoryPolicy.new(current_user, Repository).write?

to use RepositoryPolicy#write?, you now have to specify it like this:

authorize :write, record: Repository
# => RepositoryPolicy.new(current_user, Repository).write?

Also possible:

authorize :write, policy: Repository # or :repository
# => RepositoryPolicy.new(current_user, parent).write?

This would use the parent object in combination with the RepositoryPolicy, which was previously impossible (this is the main reason for the change).

You can combine this with record like this:

authorize :write, policy: :repository, record: RepositoryCompound.new
# => RepositoryPolicy.new(current_user, RepositoryCompound.new).write?

to instantiate the RepositoryPolicy with RepositoryCompound.new and call write?, which was also previously impossible.

[codecov-io]

Codecov Report

Merging #20 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #20   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines         168    172    +4     
=====================================
+ Hits          168    172    +4

Impacted Files	Coverage Δ
lib/graphql-pundit.rb	100% <100%> (ø)	⬆️
lib/graphql-pundit/instrumenters/authorization.rb	100% <100%> (ø)	⬆️

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[houndci-bot]

Lint/UselessAssignment: Useless assignment to variable - subj. Did you mean subject?

[houndci-bot]

Lint/UselessAssignment: Useless assignment to variable - subj. Did you mean subject?

[eugenk]