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Contents
# encoding: utf-8
module Mongoid
module Persistence
module Operations
# 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
# );
#
class Update
include Modification
include Operations
include Mongoid::Atomic::Positionable
# Persist the document that is to be updated to the database. This will
# only write changed fields via MongoDB's $set modifier operation.
#
# @example Update the document.
# Update.persist
#
# @return [ true, false ] If the save passed.
def persist
prepare do
unless updates.empty?
collection.find(selector).update(positionally(selector, updates))
conflicts.each_pair do |key, value|
collection.find(selector).update(
positionally(selector, { key => value })
)
end
end
end
end
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems