Remove element from IngredientSerializer

This association causes infinite recursion during
deserialization, because the element is already
included in the page's elements association's data.

lib/alchemy/json_api/ingredient_serializer.rb

@@ -4,8 +4,6 @@ module Alchemy
   module JsonApi
     module IngredientSerializer
       def self.included(klass)
-        klass.has_one :element, record_type: :element, serializer: ::Alchemy::JsonApi::ElementSerializer
-
         klass.attributes(
           :role,
           :value,

lib/alchemy/json_api/test_support/ingredient_serializer_behaviour.rb

@@ -26,12 +26,4 @@
       end
     end
   end
-
-  describe "relationships" do
-    subject { serializer.serializable_hash[:data][:relationships] }
-
-    it "has one element" do
-      expect(subject[:element]).to eq(data: {id: ingredient.element_id.to_s, type: :element})
-    end
-  end
 end