enable to paginate throurh embedded documents in mongoid

lib/kaminari/models/mongoid_criteria_methods.rb

@@ -11,7 +11,15 @@ module Kaminari
       end
 
       def total_count #:nodoc:
-        count
+        embedded? ? unpage.count : count
+      end
+
+      private
+      def unpage
+        clone.tap do |crit|
+          crit.options.delete :limit
+          crit.options.delete :skip
+        end
       end
     end
   end

lib/kaminari/models/mongoid_extension.rb

@@ -7,7 +7,7 @@ module Kaminari
 
       included do
         def page(*args)
-          self.klass.page(*args).criteria.merge(self)
+          super(*args).criteria.merge(self)
         end
       end
     end

spec/models/mongoid_spec.rb

@@ -9,11 +9,12 @@ describe Kaminari::MongoidExtension do
       field :salary, :type => Integer
     end
   end
-  before do
-    stub(subject).count { 300 } # in order to avoid DB access...
-  end
 
   describe '#page' do
+    before do
+      stub(subject).count { 300 } # in order to avoid DB access...
+    end
+
     context 'page 1' do
       subject { Developer.page 1 }
       it { should be_a Mongoid::Criteria }
@@ -58,10 +59,13 @@ describe Kaminari::MongoidExtension do
       its(:num_pages) { should == 12 }
       it { should skip 25 }
     end
-
   end
 
   describe '#per' do
+    before do
+      stub(subject).count { 300 } # in order to avoid DB access...
+    end
+
     subject { Developer.page(2).per(10) }
     it { should be_a Mongoid::Criteria }
     its(:current_page) { should == 2 }
@@ -69,4 +73,57 @@ describe Kaminari::MongoidExtension do
     its(:num_pages) { should == 30 }
     it { should skip 10 }
   end
+
+  describe '#page in embedded documents' do
+    before :all do
+      class MongoDeveloper
+        include ::Mongoid::Document
+        field :salary, :type => Integer
+        embeds_many :frameworks
+      end
+
+      class Framework
+        include ::Mongoid::Document
+        field :name, :type => String
+        field :language, :type => String
+        embedded_in :mongo_developer
+      end
+    end
+
+    before :all do
+      @mongo_developer = MongoDeveloper.new
+      @mongo_developer.frameworks.new(:name => "rails", :language => "ruby")
+      @mongo_developer.frameworks.new(:name => "merb", :language => "ruby")
+      @mongo_developer.frameworks.new(:name => "sinatra", :language => "ruby")
+      @mongo_developer.frameworks.new(:name => "cakephp", :language => "php")
+      @mongo_developer.frameworks.new(:name => "tornado", :language => "python")
+    end
+
+    context 'page 1' do
+      subject { @mongo_developer.frameworks.page(1).per(1) }
+      it { should be_a Mongoid::Criteria }
+      its(:total_count) { should == 5 }
+      its(:limit_value) { should == 1 }
+      its(:current_page) { should == 1 }
+      its(:num_pages) { should == 5 }
+    end
+
+    context 'with criteria after' do
+      subject { @mongo_developer.frameworks.page(1).per(2).where(:language => "ruby") }
+      it { should be_a Mongoid::Criteria }
+      its(:total_count) { should == 3 }
+      its(:limit_value) { should == 2 }
+      its(:current_page) { should == 1 }
+      its(:num_pages) { should == 2 }
+    end
+
+    context 'with criteria before' do
+      subject { @mongo_developer.frameworks.where(:language => "ruby").page(1).per(2) }
+      it { should be_a Mongoid::Criteria }
+      its(:total_count) { should == 3 }
+      its(:limit_value) { should == 2 }
+      its(:current_page) { should == 1 }
+      its(:num_pages) { should == 2 }
+    end
+  end
 end