Deprecate include in favor of side_load

lib/active_model/serializer.rb

@@ -19,14 +19,14 @@ module ActiveModel
 
       def embed(type, options={})
         CONFIG.embed = type
-        CONFIG.include = true if options[:include]
+        CONFIG.side_load = true if options[:side_load] || options[:include]
         ActiveSupport::Deprecation.warn <<-WARN
 ** Notice: embed is deprecated. **
 The use of .embed method on a Serializer will be soon removed, as this should have a global scope and not a class scope.
 Please use the global .setup method instead:
 ActiveModel::Serializer.setup do |config|
   config.embed = :#{type}
-  config.include = #{CONFIG.include || false}
+  config.side_load = #{CONFIG.side_load || false}
 end
         WARN
       end

lib/active_model/serializer/associations.rb

@@ -5,10 +5,16 @@ module ActiveModel
   class Serializer
     class Association
       def initialize(name, options={})
+        if options.has_key?(:include)
+          ActiveSupport::Deprecation.warn <<-WARN
+** Notice: include was renamed to side_load. **
+          WARN
+        end
+
         @name         = name.to_s
         @options      = options
         self.embed    = options.fetch(:embed)   { CONFIG.embed }
-        @side_load    = options.fetch(:include) { CONFIG.include }
+        @side_load    = options.fetch(:side_load) { options.fetch(:include) { CONFIG.side_load } }
         @embed_key    = options[:embed_key] || :id
         @key          = options[:key]
         @embedded_key = options[:root] || name