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module PropertySets
module Delegator
# methods for moving what was once a literal column on
# to a property_set table.
#
# delegates read, write and query methods to the property record or the property default
#
# Examples
#
# # Migrate :is_open to the :settings property set, and rename it :open,
# # and migrate :same to property set :same
# include PropertySets::Delegator
# delegate_to_property_set :settings, :is_open => :open, :same => :same
#
def self.included(base)
base.extend(ClassMethods)
end
module ClassMethods
def delegate_to_property_set(setname, mappings)
raise "Second argument must be a Hash" unless mappings.is_a?(Hash)
mappings.each do |old_attr, new_attr|
define_method(old_attr) { send(setname).send(new_attr) }
alias_method "#{old_attr}_before_type_cast", old_attr
define_method("#{old_attr}?") { send(setname).send("#{new_attr}?") }
define_method("#{old_attr}=") { |value| send(setname).send("#{new_attr}=", value) }
define_method("#{old_attr}_changed?") do
assoc = send(setname)
setting = assoc.lookup_without_default(new_attr)
if !setting
false # Nothing has been set which means that the attribute hasn't changed
elsif setting.new_record?
assoc.default(new_attr) != setting.value
else
setting.value_changed?
end
end
end
end
end
end
end
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11 entries across 11 versions & 1 rubygems