Fix relation_name lambda being broken (#81)

* Fix context not being passed properly in PunditScopedResource

* Always pass a hash with :context key to relation_name accessor

This seems to be the way jsonapi-resources does it. Although, at some
points JR passes way more information down the chain. Unfortunately,
that same information is not available in PunditScopedResource so I'll
just go with what we can get in all the places.

https://github.com/cerebris/jsonapi-resources/blob/5af1f17068b66b0a17b7b69e5db334c640f6f34b/lib/jsonapi/processor.rb#L170-L184

Author: valscion

lib/jsonapi/authorization/authorizing_processor.rb

@@ -347,7 +347,7 @@ def authorize_include_item(resource_klass, source_record, include_item)
             next_resource_klass = relationship.resource_klass
             Array.wrap(
               source_record.public_send(
-                relationship.relation_name(context)
+                relationship.relation_name(context: context)
               )
             ).each do |next_source_record|
               deep.each do |next_include_item|
@@ -364,7 +364,7 @@ def authorize_include_item(resource_klass, source_record, include_item)
           case relationship
           when JSONAPI::Relationship::ToOne
             related_record = source_record.public_send(
-              relationship.relation_name(context)
+              relationship.relation_name(context: context)
             )
             return if related_record.nil?
             authorizer.include_has_one_resource(source_record, related_record)

lib/jsonapi/authorization/pundit_scoped_resource.rb

@@ -31,7 +31,7 @@ def records_for(association_name)
 
       def fetch_relationship(association_name)
         relationships = self.class._relationships.select do |_k, v|
-          v.relation_name({}) == association_name
+          v.relation_name(context: context) == association_name
         end
         if relationships.empty?
           nil