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Contents
module Sequel
module Plugins
# The AssociationAutoreloading plugin makes many_to_one association
# accessor methods automatically reload the cached object whenever
# the association's foreign key is modified:
#
# Album.many_to_one :artists
# album = Album.first
# album.artist_id #=> 1
# album.artist # caches associated artist
# album.artist_id = 2
# album.artist # reloads associated artist
#
module AssociationAutoreloading
module ClassMethods
private
# Create a setter method for +key+ in an anonymous module included
# in the class that calls super and clears the cache for
# the given array of associations.
def create_autoreloading_association_setter(key, assocs)
include(@autoreloading_associations_module ||= Module.new) unless @autoreloading_associations_module
@autoreloading_associations_module.class_eval do
unless method_defined?("#{key}=")
define_method("#{key}=") do |v|
o = send(key)
super(v)
assocs.each{|a| associations.delete(a)} if send(key) != o
end
end
end
end
# For each of the foreign keys in the association, create
# a setter method that will clear the association cache.
def def_many_to_one(opts)
super
@autoreloading_associations ||= {}
opts[:keys].each do |key|
assocs = @autoreloading_associations[key] ||= []
assocs << opts[:name]
create_autoreloading_association_setter(key, assocs)
end
end
end
end
end
end
Version data entries
29 entries across 29 versions & 1 rubygems