Sha256: 9e0433620571626f9506a4f4a86de8cbb86c2e4c505707f8a407b9bf60cf0ed9
Contents?: true
Size: 1.75 KB
Versions: 9
Compression:
Stored size: 1.75 KB
Contents
class Version < ActiveRecord::Base
belongs_to :item, :polymorphic => true
validates_presence_of :event
def reify
unless object.nil?
# Attributes
attrs = YAML::load object
# Normally a polymorphic belongs_to relationship allows us
# to get the object we belong to by calling, in this case,
# +item+. However this returns nil if +item+ has been
# destroyed, and we need to be able to retrieve destroyed
# objects.
#
# In this situation we constantize the +item_type+ to get hold of
# the class...except when the stored object's attributes
# include a +type+ key. If this is the case, the object
# we belong to is using single table inheritance and the
# +item_type+ will be the base class, not the actual subclass.
# If +type+ is present but empty, the class is the base class.
if item
model = item
else
class_name = attrs['type'].blank? ? item_type : attrs['type']
klass = class_name.constantize
model = klass.new
end
attrs.each do |k, v|
begin
model.send "#{k}=", v
rescue NoMethodError
logger.warn "Attribute #{k} does not exist on #{item_type} (Version id: #{id})."
end
end
model
end
end
def next
Version.first :conditions => ["id > ? AND item_type = ? AND item_id = ?", id, item_type, item_id],
:order => 'id ASC'
end
def previous
Version.first :conditions => ["id < ? AND item_type = ? AND item_id = ?", id, item_type, item_id],
:order => 'id DESC'
end
def index
Version.all(:conditions => ["item_type = ? AND item_id = ?", item_type, item_id],
:order => 'id ASC').index(self)
end
end
Version data entries
9 entries across 9 versions & 2 rubygems