Does the update_all method in ActiveRecord return the number of rows?
I want to set the 'lock' column on a row only if it is not already set. Race conditions are likely and performance is important so this must be done in a single query. I think the solution should look like this:
开发者_开发问答class MyModel
def lock(worker)
cnt = MyModel.where(id: self.id, lock: nil).update_all(:lock=>worker.name)
cnt == 1
end
end
Does the update_all
method actually return the number of rows effected like it does in DataMapper?
Yes, it does in ActiveRecord as in DataMapper
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