Question

My question is similar to this one How to skip ActiveRecord callbacks? but instead of AR I m using Mongoid, It seems like that isn t implemented yet in the current version of Mongoid, so I d like to know what should be an elegant solution to implement it. (if necessary).

Answer 1

Yes you can!

Mongoid is built on ActiveModel and ActiveModel has a skip_callback function. You can use skip_callback like this:

# skip the callback
MyModelClass.skip_callback(:save, :before, :ensure_foo_is_not_bar)

# rescue any errors to ensure callback is restored afterwords
begin
  my_model_instance.update_attributes :foo =>  bar 
rescue
  puts "Error from  my_model_instance.update_attributes : #{$!}"
end

# restore the callback for future calls
MyModelClass.set_callback(:save, :before, :ensure_foo_is_not_bar)

I m using this without a hitch in a big app. For more info, see this blog post by Jeff Kreeftmeijer:

http://jeffkreeftmeijer.com/2010/disabling-activemodel-callbacks/

Answer 2

It might be easier to use the Mongoid atomic operations (set, unset, etc):

https://docs.mongodb.com/mongoid/current/tutorials/mongoid-persistence/#atomic

These do not fire callbacks.

Edit: Mongoid 3 says they do not fire callbacks. I am seeing them fire callbacks in Mongoid 2 though. So YMMV

Answer 3

I ended up using Brian Armstrong s suggestion and simply calling

person.set(name:"Robert Pulson")

in my after save callback.

Answer 4

Often this comes up when you want to do an update without firing all callbacks on a large volume of items. This can be done by descending to the driver:

Replacing foo by bar in the x field.

User.all.each do |u|
  User.collection.where({ _id: u.id }).update({ 
    "$set" => { :x => u.x.gsub( foo ,  bar ) 
  })
end

Answer 5

I search on the code. And there are no way to avoid callback in Mongoid. In both version 1.9 and 2.0.

You need made a patch or a feature request about that.

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