be "freezed" or we have to pay the price of the mass update (user_location). { "id" : "john", "name" : "John", "location" : "..." } myapp user question answer { "id" : 1, "title" : "My first question", "body" : "...", "user" : { "name" : "John", "location" : "..." }, "comments" : [ { "body" : "...", "user" : { ... } }, { "body" : "...", "user" : { ... } } ] } { "id" : 2, "title" : "My first answer", "parent_id" : 1, "user" : { "name" : "Robert", "location" : "..." }, "comments" : [ { "body" : "...", "user" : { ... } } ] } parent_id comment comment