Question

I’ve run into a bizarre. I have a model GuardianUpdate with a field “read” which is a boolean. When I go to call update_attribute(:read, true) on a record, rails fails to actually update the record.

Here is my console output:

1.9.3p0 :026 > g = GuardianUpdate.find(1)
  GuardianUpdate Load (0.7ms)  SELECT `guardian_updates`.* FROM `guardian_updates` WHERE `guardian_updates`.`id` = 1 LIMIT 1
 => #<GuardianUpdate id: 1, update_id: 2, guardian_id: 11, read: true, created_at: "2012-04-21 04:06:45", updated_at: "2012-04-21 04:06:45"> 
1.9.3p0 :027 > g.update_attribute(:read, false)
   (0.3ms)  BEGIN
  Update Load (0.4ms)  SELECT `updates`.* FROM `updates` WHERE `updates`.`id` = 2 LIMIT 1
   (0.1ms)  COMMIT
 => true 
1.9.3p0 :028 > g.reload
  GuardianUpdate Load (0.5ms)  SELECT `guardian_updates`.* FROM `guardian_updates` WHERE `guardian_updates`.`id` = 1 LIMIT 1
 => #<GuardianUpdate id: 1, update_id: 2, guardian_id: 11, read: true, created_at: "2012-04-21 04:06:45", updated_at: "2012-04-21 04:06:45"> 
1.9.3p0 :029 > 

As you can tell, there is no UPDATE sql statement anywhere. Here’s my GuaridanUpdate model:

class GuardianUpdate < ActiveRecord::Base
  belongs_to :update
  belongs_to :guardian
end

Any thoughts?

I should mention that update_column(:read, true) works, no problem at all.

Answer 1

The belongs_to :update is creating an update accessor that is overwriting the internal rails method of the same name. That method is the one responsible for actually saving changes to an existant object.

Rename the association and you should be ok. Rails is suppose to raise a DangerousAttributeName exception to warn you of this – not sure why this isn’t happening