Remove extra reflection classes

lib/active_model/serializer/belongs_to_reflection.rb

@@ -1,7 +1,7 @@
 module ActiveModel
   class Serializer
     # @api private
-    class BelongsToReflection < SingularReflection
+    class BelongsToReflection < Reflection
     end
   end
 end

lib/active_model/serializer/collection_reflection.rb

@@ -1,7 +0,0 @@
-module ActiveModel
-  class Serializer
-    # @api private
-    class CollectionReflection < Reflection
-    end
-  end
-end

lib/active_model/serializer/has_many_reflection.rb

@@ -1,8 +1,8 @@
 module ActiveModel
   class Serializer
     # @api private
-    class HasManyReflection < CollectionReflection
-      def to_many?
+    class HasManyReflection < Reflection
+      def collection?
         true
       end
     end

lib/active_model/serializer/has_one_reflection.rb

@@ -1,7 +1,7 @@
 module ActiveModel
   class Serializer
     # @api private
-    class HasOneReflection < SingularReflection
+    class HasOneReflection < Reflection
     end
   end
 end

lib/active_model/serializer/reflection.rb

@@ -121,7 +121,7 @@ module ActiveModel
         :nil
       end
 
-      def to_many?
+      def collection?
         false
       end
 
@@ -235,7 +235,7 @@ module ActiveModel
       end
 
       def build_serializer!(association_value, serializer_class, parent_serializer, parent_serializer_options)
-        if to_many?
+        if collection?
           build_association_collection_serializer(parent_serializer, parent_serializer_options, association_value, serializer_class)
         else
           build_association_serializer(parent_serializer, parent_serializer_options, association_value, serializer_class)

lib/active_model/serializer/singular_reflection.rb

@@ -1,7 +0,0 @@
-module ActiveModel
-  class Serializer
-    # @api private
-    class SingularReflection < Reflection
-    end
-  end
-end