Class | Mongoid::Persistence::Operations::Update |
In: |
lib/mongoid/persistence/operations/update.rb
|
Parent: | Object |
Update is a persistence command responsible for taking a document that has already been saved to the database and saving it, depending on whether or not the document has been modified.
Before persisting the command will check via dirty attributes if the document has changed, if not, it will simply return true. If it has it will go through the validation steps, run callbacks, and set the changed fields atomically on the document. The underlying query resembles the following MongoDB query:
collection.update( { "_id" : 1, { "$set" : { "field" : "value" }, false, false );
For embedded documents it will use the positional locator:
collection.update( { "_id" : 1, "addresses._id" : 2 }, { "$set" : { "addresses.$.field" : "value" }, false, false );