Install mongoid only on 1.9

Gemfile

@@ -22,8 +22,11 @@ end
 
 platforms :ruby do
   gem "sqlite3"
+end
 
+
+platforms :mri_19 do
   group :mongoid do
     gem "mongoid", "~> 3.0"
   end
-end
+end

Gemfile.lock

@@ -59,12 +59,12 @@ GEM
     mime-types (1.19)
     mocha (0.10.0)
       metaclass (~> 0.0.1)
-    mongoid (3.0.14)
+    mongoid (3.0.16)
       activemodel (~> 3.1)
       moped (~> 1.1)
       origin (~> 1.0)
       tzinfo (~> 0.3.22)
-    moped (1.3.1)
+    moped (1.3.2)
     multi_json (1.5.0)
     multipart-post (1.1.5)
     nokogiri (1.5.5)

gemfiles/Gemfile.rails-3.1.x

@@ -26,8 +26,10 @@ end
 
 platforms :ruby do
   gem "sqlite3"
+end
 
+platforms :mri_19 do
   group :mongoid do
     gem "mongoid", "~> 3.0"
   end
-end
+end