Merge pull request mongodb#1082 from skippy/add_size_length

add aliases :size, :length to :count.

lib/mongoid/contexts/mongo.rb

@@ -88,6 +88,8 @@ def blank?
       def count(extras = false)
         @count ||= klass.collection.find(selector, process_options).count(extras)
       end
+      alias :size :count
+      alias :length :count
 
       # Delete all the documents in the database matching the selector.
       #

lib/mongoid/criteria.rb

@@ -47,6 +47,8 @@ class Criteria
       :avg,
       :blank?,
       :count,
+      :size,
+      :length,
       :delete,
       :delete_all,
       :destroy,

spec/unit/mongoid/criteria_spec.rb

@@ -237,6 +237,28 @@
       end
     end
 
+    describe "#size" do
+
+      before do
+        context.expects(:size).returns(10)
+      end
+
+      it "delegates to the context" do
+        criteria.size.should == 10
+      end
+    end
+
+    describe "#length" do
+
+      before do
+        context.expects(:length).returns(10)
+      end
+
+      it "delegates to the context" do
+        criteria.length.should == 10
+      end
+    end
+
     describe "#exists?" do
 
       context "when there are documents in the db" do