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Polymorphic Resource Owner
Enables polymorphic Resource Owner feature for Doorkeeper Access Tokens & Grants. By default Doorkeeper set only resource_owner_id without knowing model name of the Resource Owner.
Feature available only starting from Doorkeeper 5.4.

How to use it

Enable configuration option:
config/initializers/doorkeeper.rb
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Doorkeeper.configure do
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orm :active_record
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use_polymorphic_resource_owner
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end
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Generate migration to add polymorphic columns to tables:
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$ bundle exec rails g doorkeeper:enable_polymorphic_resource_owner
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If you previously set foreign key for :resource_owner_id column - you need to drop it as now it would be a polymorphic association. You can drop FK in the migration generated above.
Run the migration:
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$ bundle exec rails db:migrate
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Use the feature!
Now you can access resource owner by doorkeeper_token.resource_owner association.
:warning: :warning: [ATTENTION]: If you enabled this option on existing project - you need to manually set polymorphic type column with the class of the Resource Owner. Otherwise your existing users/clients could face issues and spam you logs with errors.
:warning: :warning: [ATTENTION]: Also this feature could be a breaking change for those users that patched Doorkeeper internals, specially models. You need to fix your patches to user resource_owner instance instead of it's ID (like it was before).

Known projects affected