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This change brings some performance improvements, by avoiding to create the extra controller singleton classes, created by instance_exec, when :only or :except are passed to a callback.
This PR changes can_find_inverse_of_automatically to allow us to automatically detect inverse_of when there is a scope on the association, but not when there is a scope on the potential inverse association. Since this is a breaking change, it is placed behind the automatic_scope_inversing configuration flag, which is set to true for new applications via framework defaults.
A new a configuration option enables lazy loading of the schema cache on the connection. If config.active_record.lazily_load_schema_cache is set to true then the schema cache will be loaded when the connection is established rather than on boot.