Added the ability to turn off serializer inference

lib/grape-active_model_serializers/formatter.rb

@@ -4,10 +4,12 @@ module Grape
   module Formatter
     module ActiveModelSerializers
       class << self
-
+        attr_accessor :infer_serializers
         attr_reader :env
         attr_reader :endpoint
 
+        ActiveModelSerializers.infer_serializers = true
+
         def call(object, env)
           @object = object
           @env = env
@@ -22,19 +24,17 @@ module Grape
         end
 
         private
-        def active_model_serializer
-          _active_model_serializer
-        end
 
         def active_model_serializer?
           !!active_model_serializer
         end
 
-        def _active_model_serializer
+        def active_model_serializer
           route_options = endpoint.options[:route_options]
-
           # Infer serializer name if its not set
-          route_options[:serializer] = @object.class.name unless route_options.has_key? :serializer
+          if self.infer_serializers
+            route_options[:serializer] = @object.class.name unless route_options.has_key? :serializer
+          end
 
           serializer = route_options[:serializer]
 

spec/grape_ams_spec.rb

@@ -43,6 +43,21 @@ describe Grape::ActiveModelSerializers do
     last_response.body.should == '{:user=>{:first_name=>"JR", :last_name=>"HE"}}'
   end
 
+  context "serializer inference is disabled" do
+    before do
+      Grape::Formatter::ActiveModelSerializers.infer_serializers = false
+    end
+
+    it "should NOT infer serializer when there is no serializer set" do
+      subject.get("/home") do
+          User.new({first_name: 'JR', last_name: 'HE', email: 'contact@jrhe.co.uk'})
+      end
+
+      get "/home"
+      last_response.body.should == "{\"user\":{\"created_at\":null,\"first_name\":\"JR\",\"id\":null,\"last_name\":\"HE\",\"updated_at\":null,\"username\":null}}"
+    end
+  end
+
   [UserSerializer, 'user', :user].each do |serializer|
     it "should render using serializer (#{serializer})" do
       subject.get("/home", serializer: serializer) do