2.1.7 :001 > class Something
2.1.7 :002?>     include Mongoid::Document
2.1.7 :003?>    
2.1.7 :004 >       field :data, :type => Hash
2.1.7 :005?>   end
 => #<Mongoid::Fields::Standard:0x007fa0832885e0 @name="data", @options={:type=>Hash, :klass=>Something}, @label=nil, @default_val=nil>
2.1.7 :028 > Something.delete_all
D, [2015-09-30T16:03:26.098733 #29235] DEBUG -- : MONGODB | staging.db.donde.io:27000 | backend-staging.count | STARTED | {"count"=>"somethings", "query"=>{}}
D, [2015-09-30T16:03:26.136089 #29235] DEBUG -- : MONGODB | staging.db.donde.io:27000 | backend-staging.count | SUCCEEDED | 0.037203s
D, [2015-09-30T16:03:26.172693 #29235] DEBUG -- : MONGODB | staging.db.donde.io:27000 | backend-staging.delete | STARTED | {"delete"=>"somethings", "deletes"=>[{"q"=>{}, "limit"=>0}], "writeConcern"=>{:w=>1}, "ordered"=>true}
D, [2015-09-30T16:03:26.209038 #29235] DEBUG -- : MONGODB | staging.db.donde.io:27000 | backend-staging.delete | SUCCEEDED | 0.036203s
 => 1.0 
2.1.7 :029 >  Something.create :data => {"a" => 55}
D, [2015-09-30T16:03:34.432691 #29235] DEBUG -- : MONGODB | staging.db.donde.io:27000 | backend-staging.insert | STARTED | {"insert"=>"somethings", "documents"=>[{"_id"=>BSON::ObjectId('560c4e2664b1f37233000003'), "data"=>{"a"=>55}}], "writeConcern"=>{:w=>1}, "ordered"=>true}
D, [2015-09-30T16:03:34.469041 #29235] DEBUG -- : MONGODB | staging.db.donde.io:27000 | backend-staging.insert | SUCCEEDED | 0.036208000000000004s
 => #<Something _id: 560c4e2664b1f37233000003, data: {"a"=>55}> 
2.1.7 :030 >  s = Something.find("560c4e2664b1f37233000003")
D, [2015-09-30T16:03:46.981901 #29235] DEBUG -- : MONGODB | staging.db.donde.io:27000 | backend-staging.find | STARTED | {"find"=>"somethings", "filter"=>{"_id"=>BSON::ObjectId('560c4e2664b1f37233000003')}}
D, [2015-09-30T16:03:47.026019 #29235] DEBUG -- : MONGODB | staging.db.donde.io:27000 | backend-staging.find | SUCCEEDED | 0.043991s
 => #<Something _id: 560c4e2664b1f37233000003, data: {"a"=>55}> 
2.1.7 :031 > s["data"]
 => {"a"=>55} 
2.1.7 :032 > s["data"]["a"]=33
 => 33 
2.1.7 :033 > s.changes
 => {} 
2.1.7 :034 > s["data"]
 => {"a"=>33} 
2.1.7 :035 > s.save!
 => true 
2.1.7 :036 > s["data"]
 => {"a"=>33} 
2.1.7 :037 > s.reload
D, [2015-09-30T16:10:32.711795 #29235] DEBUG -- : MONGODB | staging.db.donde.io:27000 | backend-staging.find | STARTED | {"find"=>"somethings", "filter"=>{:_id=>BSON::ObjectId('560c4e2664b1f37233000003')}}
D, [2015-09-30T16:10:32.747745 #29235] DEBUG -- : MONGODB | staging.db.donde.io:27000 | backend-staging.find | SUCCEEDED | 0.035806s
 => #<Something _id: 560c4e2664b1f37233000003, data: {"a"=>55}> 
2.1.7 :038 > s["data"]
 => {"a"=>55}