Module: ActsAsReplaceable::InstanceMethods

Defined in:
lib/acts_as_replaceable/acts_as_replaceable.rb

Instance Method Summary collapse

Instance Method Details

#_create_record(*args) ⇒ Object

Override the create or update method so we can run callbacks, but opt not to save if we don’t need to



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# File 'lib/acts_as_replaceable/acts_as_replaceable.rb', line 152

def _create_record(*args)
  ActsAsReplaceable::HelperMethods.lock_if(ActsAsReplaceable.concurrency, self) do
    find_and_replace
    if @has_not_changed
      logger.info "(acts_as_replaceable) Found unchanged #{self.class.to_s} ##{id} #{"- Name: #{name}" if respond_to?('name')}"
    elsif @has_been_replaced
      _update_record(*args)
      logger.info "(acts_as_replaceable) Updated existing #{self.class.to_s} ##{id} #{"- Name: #{name}" if respond_to?('name')}"
    else
      super
      logger.info "(acts_as_replaceable) Created #{self.class.to_s} ##{id} #{"- Name: #{name}" if respond_to?('name')}"
    end
  end

  return true
end

#find_and_replace ⇒ Object

Replaces self with an existing copy from the database if available, raises an exception if more than one copy exists in the database



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# File 'lib/acts_as_replaceable/acts_as_replaceable.rb', line 170

def find_and_replace
  existing = ActsAsReplaceable::HelperMethods.find_existing(self)

  if existing.length > 1
    raise RecordNotUnique, "#{existing.length} duplicate #{self.class.model_name.human.pluralize} present in database"
  end

  replace_with(existing.first) if existing.first
end

#replace_with(existing) ⇒ Object 



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# File 'lib/acts_as_replaceable/acts_as_replaceable.rb', line 180

def replace_with(existing)
  # Inherit target's attributes for those in acts_as_replaceable_options[:inherit]
  ActsAsReplaceable::HelperMethods.copy_attributes(acts_as_replaceable_options[:inherit], existing, self)

  # Rails 5 introduced AR::Dirty and started using `mutations_from_database` to
  # lookup `id_in_database` which is required for the `_update_record` call
  #
  # This chunk of code is copied from https://api.rubyonrails.org/classes/ActiveRecord/Persistence.html#method-i-becomes
  if existing.respond_to?(:mutations_from_database, true)
    instance_variable_set("@mutations_from_database", existing.send(:mutations_from_database) || nil)
  end

  @new_record        = false
  @has_been_replaced = true
  @has_not_changed   = !ActsAsReplaceable::HelperMethods.mark_changes(self, existing)
end