Fixing respond_to on the many relations

lib/mongoid/relations/many.rb

@@ -80,7 +80,8 @@ def nil?
       #
       # @since 2.0.0
       def respond_to?(name, include_private = false)
-        [].respond_to?(name, include_private) || super
+        [].respond_to?(name, include_private) ||
+          klass.respond_to?(name, include_private) || super
       end
 
       # This is public access to the relation's criteria.

lib/mongoid/relations/proxy.rb

@@ -9,7 +9,7 @@ class Proxy
       # We undefine most methods to get them sent through to the target.
       instance_methods.each do |method|
         undef_method(method) unless
-          method =~ /(^__|^send$|^object_id$|^extend$|^tap$)/
+          method =~ /(^__|^send$|^object_id$|^extend$|^respond_to\?$|^tap$)/
       end
 
       attr_accessor :base, :loaded, :metadata, :target

spec/unit/mongoid/relations/embedded/many_spec.rb

@@ -595,14 +595,48 @@
     end
   end
 
-  describe "respond_to?" do
+  describe "#respond_to?" do
 
-    let(:relation) do
-      described_class.new(base, target, metadata)
+    let(:person) do
+      Person.new
+    end
+
+    let(:addresses) do
+      person.addresses
+    end
+
+    Array.public_instance_methods.each do |method|
+
+      context "when checking #{method}" do
+
+        it "returns true" do
+          addresses.respond_to?(method).should be_true
+        end
+      end
+    end
+
+    Mongoid::Relations::Embedded::Many.public_instance_methods.each do |method|
+
+      context "when checking #{method}" do
+
+        it "returns true" do
+          addresses.respond_to?(method).should be_true
+        end
+      end
+    end
+
+    Address.scopes.keys.each do |method|
+
+      context "when checking #{method}" do
+
+        it "returns true" do
+          addresses.respond_to?(method).should be_true
+        end
+      end
     end
 
     it "supports 'include_private = boolean'" do
-      expect { relation.respond_to?(:Rational, true) }.not_to raise_error
+      expect { addresses.respond_to?(:Rational, true) }.not_to raise_error
     end
   end
 end

spec/unit/mongoid/relations/referenced/many_spec.rb

@@ -43,6 +43,47 @@
     end
   end
 
+  describe "#respond_to?" do
+
+    let(:person) do
+      Person.new
+    end
+
+    let(:posts) do
+      person.posts
+    end
+
+    Array.public_instance_methods.each do |method|
+
+      context "when checking #{method}" do
+
+        it "returns true" do
+          posts.respond_to?(method).should be_true
+        end
+      end
+    end
+
+    Mongoid::Relations::Referenced::Many.public_instance_methods.each do |method|
+
+      context "when checking #{method}" do
+
+        it "returns true" do
+          posts.respond_to?(method).should be_true
+        end
+      end
+    end
+
+    Post.scopes.keys.each do |method|
+
+      context "when checking #{method}" do
+
+        it "returns true" do
+          posts.respond_to?(method).should be_true
+        end
+      end
+    end
+  end
+
   describe ".stores_foreign_key?" do
 
     it "returns false" do

spec/unit/mongoid/relations/referenced/many_to_many_spec.rb

@@ -43,6 +43,47 @@
     end
   end
 
+  describe "#respond_to?" do
+
+    let(:person) do
+      Person.new
+    end
+
+    let(:preferences) do
+      person.preferences
+    end
+
+    Array.public_instance_methods.each do |method|
+
+      context "when checking #{method}" do
+
+        it "returns true" do
+          preferences.respond_to?(method).should be_true
+        end
+      end
+    end
+
+    Mongoid::Relations::Referenced::Many.public_instance_methods.each do |method|
+
+      context "when checking #{method}" do
+
+        it "returns true" do
+          preferences.respond_to?(method).should be_true
+        end
+      end
+    end
+
+    Preference.scopes.keys.each do |method|
+
+      context "when checking #{method}" do
+
+        it "returns true" do
+          preferences.respond_to?(method).should be_true
+        end
+      end
+    end
+  end
+
   describe ".stores_foreign_key?" do
 
     it "returns true" do