I use authlogic for authentication and paperclip for handling user's profile picture attachments.
I use the following method to get the current_user
def current_user_session
return @current_user_session if defined?
(@current_user_session)
@current_user_session = UserSession.find
end
def current_user
return @current_user if defined?(@current_user)
@current_user = current_user_session &&
current_user_session.record
end
and the following after_save callback to regenerate the profile image if the image has changed.
after_save do |user|
if user.image_changed?
Delayed::Job.enqueue ImageJob.new(user.id)
end
end
The current_user method issues a UserSession.find call and Looking at the docs it seems UserSession.tries to Log the user in, which results in an update to certain fields (updated_at, token etc. but not the profile image), which results in a save of the user record, which in my case results in after_save callbacks firing. This after save callback checks to see if there has been a change to user's profile image, which unnecessarily consumes time.
Now this is fine if the user indeed is trying to update profile, but since I use current_user in many different places within my app, this callback is getting fired (and its an expensive call), for no reason.
I understand this isn't exactly authlogic issue, but is there anyway I can avoid this, ie either not update the user record or somehow differentiate between what is a profile update and what is an update resulting from this UserSession.find login?
Thanks
Here is the solution that worked based on bjg's suggestion.
before_save :check_what_changed
def check_what_changed if self.changed.sort == ["last_request_at", "perishable_token"] self.skip_profile_update = true return true else self.skip_profile_update = false return true end end
Update #2 I take that back that didn't work, but it's not really a problem with this solution, for some reason paperclip tries to save the attachments even before the after_save callback. This is likely a paperclip issue, no idea..
In a before_save
callback, you could differentiate between a real profile change and the Authlogic related changes ( last_request_at
and updated_at
attributes) using the Rails built-in dirty objects tracking facility. Something along these lines
attr_accessor :skip_profile_update
before_save do |model|
model.skip_profile_update = (model.changed.sort == ['last_request_at', 'updated_at'])
end
after_save do |model|
unless model.skip_profile_update
# etc
end
end
I was having a problem with bjg's solution because sometimes I'd ONLY get 'last_request_at' and not 'updated_at' and so skip_profile_update would be false.
I changed it to this which is a whitelisted list of fields which SHOULD trigger the after_save, rather than the blacklist method. It could be easily changed to blacklist by changing the array comparison method . I also found it necessary to include all the 'true's because I was getting those dreaded "ActiveRecord record not saved" errors otherwise.
attr_accessor :record_activity
before_save do |user|
user.record_activity = (user.changed & ['email', 'birthday', 'zip', 'gender']).present?
true
end
after_update do |user|
if user.record_activity
user.send(:record_update_activity)
true
end
true
end
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