CODEWITHSUNDEEP
ruby-on-rails-4activerecordmodelcallbackarguments
Rubytastic
Rubytastic

Reputation: 15491

Pass custom argument to rails event model callbacks?

Very simple question but was unable to figure this out. Is it possible to do like:

  after_create    :log_activity(my_var)

So I could write 1 method that handles all the actions ( destroy,save,update)?

Upvotes: 3

Views: 3407

Answers (4)

David Hempy
David Hempy

Reputation: 6247

I'm not sure if this is new in Rails 4.2 vs. when you asked the question was asked, but this works:

after_create -> { log_activity(my_var) }

I wonder if the question you're really getting at is about the scope of my_var. What is your intention with my_var?

Upvotes: 1

Mosab.Mohamed
Mosab.Mohamed

Reputation: 131

You can do something like that:

after_create Proc.new{ log_activity(my_var) }

def log_activity(my_var)
 :
end

Upvotes: 1

ᴹᴵᴷᴴᴬᴵᴸ ᴹᴼᴿᴳᵁᴺᴼᵛ
ᴹᴵᴷᴴᴬᴵᴸ ᴹᴼᴿᴳᵁᴺᴼᵛ

Reputation: 753

If I right understand you than in my practice was case to update user's balance on create or destroy salary. so try this code:

class Salary < ActiveRecord::Base

after_create  { |action| action.update_user_balance(1) }
before_destroy { |action| action.update_user_balance(-1) }

def update_user_balance(val) #val can be +1/-1
  user = self.user
  user.update(balance: user.balance + self.sum * val)
end

Hope this will help you! :)

Upvotes: 0

Shahzad Tariq
Shahzad Tariq

Reputation: 2857

No, it is not possible to pass variables to callback method. Reason is simple as callback methods are called by rails stack and when it will call callback method, it did't know what to pass in callback method.

Upvotes: 5

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