Chatwoot/app/models/channel/facebook_page.rb

module Channel
  class FacebookPage < ApplicationRecord
    self.table_name = 'channel_facebook_pages'

    validates :account_id, presence: true
    validates_uniqueness_of :page_id, scope: :account_id
    mount_uploader :avatar, AvatarUploader
    belongs_to :account

    has_one :inbox, as: :channel, dependent: :destroy

    before_destroy :unsubscribe

    def name
      'Facebook'
    end

    private

    def unsubscribe
      Facebook::Messenger::Subscriptions.unsubscribe(access_token: page_access_token)
    rescue => e
      true
    end
  end
end