CODEWITHSUNDEEP
rails-activestorageruby-on-rails-5.2
Dror
Dror

Reputation: 79

Rails 5.2 Callback for Active Storage Blob?

How can I implement a callback (like before_save) on ActiveStorage::Blob?

I try to add the follow to my Initializers folder as blob.rb: 

require 'active_storage/blob'

class ActiveStorage::Blob
  before_save :do_something

  def do_something

  end
end

but getting error while running the server:

method_missing: undefined method `has_one_attached' for # (NoMethodError) Did you mean? has_attached_file

Any ideas? Different approach? Thanks.

Upvotes: 2

Views: 899

Answers (2)

NoMan Ilyas
NoMan Ilyas

Reputation: 33

you can create a class like active_storage_blob_extension.rb in app/models

module ActiveStorageBlobExtension

  extend ActiveSupport::Concern

  included do
    before_save :do_something

    def do_something
        # do something
    end

  end
end

and add it in config/application.rb

config.to_prepare do
   ActiveStorage::Blob.send :include, ::ActiveStorageBlobExtension
end

the before_save callback will be called before is saved

Upvotes: 0

Rafał Roźniakowski
Rafał Roźniakowski

Reputation: 11

You can use https://github.com/rails/rails-observers

class ActiveStorageBlobObserver < ActiveRecord::Observer
  observe "active_storage/blob"

  def after_destroy(blob)
    do_something
  end
end

Upvotes: 1

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