1 files changed, 32 insertions, 1 deletions
diff --git a/activemodel/lib/active_model/serialization.rb b/activemodel/lib/active_model/serialization.rb
index 976f50b13e..f95849eb84 100644
--- a/activemodel/lib/active_model/serialization.rb
+++ b/activemodel/lib/active_model/serialization.rb
@@ -94,6 +94,37 @@ module ActiveModel
     #   person.serializable_hash(except: :name) # => {"age"=>22}
     #   person.serializable_hash(methods: :capitalized_name)
     #   # => {"name"=>"bob", "age"=>22, "capitalized_name"=>"Bob"}
+    #
+    # Example with <tt>:include</tt> option
+    #
+    #   class User
+    #     include ActiveModel::Serializers::JSON
+    #     attr_accessor :name, :notes # Emulate has_many :notes
+    #     def attributes
+    #       {'name' => nil}
+    #     end
+    #   end
+    #
+    #   class Note
+    #     include ActiveModel::Serializers::JSON
+    #     attr_accessor :title, :text
+    #     def attributes
+    #       {'title' => nil, 'text' => nil}
+    #     end
+    #   end
+    #
+    #   note = Note.new
+    #   note.title = 'Battle of Austerlitz'
+    #   note.text = 'Some text here'
+    #
+    #   user = User.new
+    #   user.name = 'Napoleon'
+    #   user.notes = [note]
+    #
+    #   user.serializable_hash
+    #   # => {"name" => "Napoleon"}
+    #   user.serializable_hash(include: { notes: { only: 'title' }})
+    #   # => {"name" => "Napoleon", "notes" => [{"title"=>"Battle of Austerlitz"}]}
     def serializable_hash(options = nil)
       options ||= {}
 
@@ -107,7 +138,7 @@ module ActiveModel
       hash = {}
       attribute_names.each { |n| hash[n] = read_attribute_for_serialization(n) }
 
-      Array(options[:methods]).each { |m| hash[m.to_s] = send(m) if respond_to?(m) }
+      Array(options[:methods]).each { |m| hash[m.to_s] = send(m) }
 
       serializable_add_includes(options) do |association, records, opts|
         hash[association.to_s] = if records.respond_to?(:to_ary)