Add relevant extra fields to associated query.

This change causes the `on_extra_attribute` hooks to fire when a resource
is side loaded through an association, which makes behavior more consitent
with loading a resource with extra_attributes directly.

Author: gfmurphy

lib/graphiti/query.rb

@@ -47,7 +47,11 @@ def hash
         h[:filter] = filters
         h[:sort] = sorts
         h[:page] = pagination
-        unless association?
+        if association?
+          h[:extra_fields] = {
+             @resource.class.type => extra_fields[@resource.class.type]
+           } if extra_fields.key?(@resource.class.type)
+        else
           h[:fields] = fields
           h[:extra_fields] = extra_fields
         end

spec/query_spec.rb

@@ -744,8 +744,11 @@
             },
             include: {
               positions: {
+                extra_fields: {positions: [:baz]},
                 include: {
-                  department: {}
+                  department: {
+                    extra_fields: {departments: [:bax] }
+                  }
                 }
               }
             }