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module ComfortableMexicanSofa::HasRevisions
def self.included(base)
base.send :extend, ClassMethods
end
module ClassMethods
def cms_has_revisions_for(*fields)
include ComfortableMexicanSofa::HasRevisions::InstanceMethods
attr_accessor :revision_data
has_many :revisions,
:as => :record,
:dependent => :destroy
before_save :prepare_revision
after_save :create_revision
define_method(:revision_fields) do
fields.collect(&:to_s)
end
end
end
module InstanceMethods
# Preparing revision data. A bit of a special thing to grab page blocks
def prepare_revision
return if self.new_record?
if (self.respond_to?(:blocks_attributes_changed) && self.blocks_attributes_changed) ||
!(self.changed & revision_fields).empty?
self.revision_data = revision_fields.inject({}) do |c, field|
c[field] = self.send("#{field}_was")
c
end
end
end
# Revision is created only if relevant data changed
def create_revision
return unless self.revision_data
# creating revision
if ComfortableMexicanSofa.config.revisions_limit.to_i != 0
self.revisions.create!(:data => self.revision_data)
end
# blowing away old revisions
ids = [0] + self.revisions.limit(ComfortableMexicanSofa.config.revisions_limit.to_i).collect(&:id)
self.revisions.where('id NOT IN (?)', ids).destroy_all
end
# Assigning whatever is found in revision data and attemptint to save the object
def restore_from_revision(revision)
return unless revision.record == self
self.update_attributes!(revision.data)
end
end
end
ActiveRecord::Base.send :include, ComfortableMexicanSofa::HasRevisions
Version data entries
94 entries across 94 versions & 1 rubygems