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Contents
module Sequel
module Plugins
# The update_primary_key plugin allows you to modify an object's
# primary key and then save the record. Sequel does not work
# correctly with primary key modifications by default. Sequel
# is designed to work with surrogate primary keys that never need to be
# modified, but this plugin makes it work correctly with natural
# primary keys that may need to be modified. Example:
#
# album = Album[1]
# album.id = 2
# album.save
#
# Usage:
#
# # Make all model subclasses support primary key updates
# # (called before loading subclasses)
# Sequel::Model.plugin :update_primary_key
#
# # Make the Album class support primary key updates
# Album.plugin :update_primary_key
module UpdatePrimaryKey
module ClassMethods
# Cache the pk_hash when loading records
def call(h)
r = super(h)
r.pk_hash
r
end
end
module InstanceMethods
# Clear the pk_hash and object dataset cache, and recache
# the pk_hash
def after_update
super
@pk_hash = nil
pk_hash
end
# Cache the pk_hash instead of generating it every time
def pk_hash
@pk_hash ||= super
end
end
end
end
end
Version data entries
20 entries across 20 versions & 1 rubygems