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Contents
module Lotus
module Entity
# Dirty tracking for entities
#
# @since 0.3.1
#
# @example Dirty tracking
# require 'lotus/model'
#
# class User
# include Lotus::Entity
# include Lotus::Entity::DirtyTracking
#
# attributes :name
# end
#
# article = Article.new(title: 'Generation P')
# article.changed? # => false
#
# article.title = 'Master and Margarita'
# article.changed? # => true
#
# article.changed_attributes # => {:title => "Generation P"}
module DirtyTracking
# Override initialize process.
#
# @param attributes [Hash] a set of attribute names and values
#
# @since 0.3.1
#
# @see Lotus::Entity#initialize
def initialize(attributes = {})
super
@_initial_state = Utils::Hash.new(to_h).deep_dup
end
# Getter for hash of changed attributes.
# Return empty hash, if there is no changes
# Getter for hash of changed attributes. Value in it is the previous one.
#
# @return [::Hash] the changed attributes
#
# @since 0.3.1
#
# @example
# require 'lotus/model'
#
# class Article
# include Lotus::Entity
# include Lotus::Entity::DirtyTracking
#
# attributes :title
# end
#
# article = Article.new(title: 'The crime and punishment')
# article.changed_attributes # => {}
#
# article.title = 'Master and Margarita'
# article.changed_attributes # => {:title => "The crime and punishment"}
def changed_attributes
Hash[@_initial_state.to_a - to_h.to_a]
end
# Checks if the attributes were changed
#
# @return [TrueClass, FalseClass] the result of the check
#
# @since 0.3.1
def changed?
changed_attributes.any?
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems