match = LegislatorDynamicFinderMatch.new(method_sym)
if match.match?
find(match.attribute => arguments.first)
else
super
end
end
def self.respond_to?(method_sym, include_private = false)
if LegislatorDynamicFinderMatch.new(method_sym).match?
true
else
super
end
end
end
缓存 method_missing
重复多次的method_missing可以考虑缓存。
另外一个我们可以向ActiveRecord 学习的是，当定义method_missing的时候，发送 now-defined方法。如下：
class Legislator
def self.method_missing(method_sym, *arguments, &block)
match = LegislatorDynamicFinderMatch.new(method_sym)
if match.match?
define_dynamic_finder(method_sym, match.attribute)
send(method_sym, arguments.first)
else
super
end
end
protected
def self.define_dynamic_finder(finder, attribute)
class_eval <<-RUBY
def self.#{finder}(#{attribute}) # def self.find_by_first_name(first_name)
find(:#{attribute} => #{attribute}) # find(:first_name => first_name)
end # end
RUBY
end
end
测试
测试部分如下：
describe LegislatorDynamicFinderMatch do
describe 'find_by_first_name' do
before do
@match = LegislatorDynamicFinderMatch.new(:find_by_first_name)
end
it 'should have attribute :first_name' do
@match.attribute.should == :first_name
end
it 'should be a match' do
@match.should be_a_match
end
end
describe 'zomg' do
before do
@match = LegislatorDynamicFinderMatch(:zomg)
