Class: Mongoid::Persistence::Atomic::Pop

Inherits:
Object
  • Object
show all
Includes:
Operation
Defined in:
lib/mongoid/persistence/atomic/pop.rb

Overview

This class provides the ability to perform an explicit $pop modification on a specific field.

Instance Attribute Summary

Attributes included from Operation

#document, #field, #options, #value

Instance Method Summary collapse

Methods included from Operation

#collection, #initialize, #operation, #path, #prepare

Instance Method Details

#persist ⇒ Object

Sends the atomic $pop operation to the database.

Examples:

Persist the new values.

pop.persist

Returns:

  • (Object) —

    The new array value.

Since:

  • 2.1.0



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# File 'lib/mongoid/persistence/atomic/pop.rb', line 19

def persist
  prepare do
    if document[field]
      values = document.send(field)
      value > 0 ? values.pop : values.shift
      values.tap do
        collection.update(document.atomic_selector, operation("$pop"), options)
        document.remove_change(field) if document.persisted?
      end
    end
  end
end