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Contents
# The dot operator calls methods on objects. Power Dots are dots with extra features
#
# .? calls a method if the reciever is not nil, returns nil
# otherwise. We have to write it ._?. in order to be valid Ruby
#
# .try. calls a mehod only if the recipient resonds to that method
require 'delegate'
require 'singleton'
require 'blankslate'
module HoboSupport
def self.hobo_try(this, *args, &block)
if args.length==0
# Hobo style try
CallIfAvailable.new(this)
else
# activesupport 2.3 style try
this.send(*args, &block)
end
end
end
class Object
def _?()
self
end
def try(*args, &block)
HoboSupport.hobo_try(self, *args, &block)
end
end
class NilClass
def _?()
SafeNil.instance
end
def try(*args)
if args.length==0
# Hobo style try
CallIfAvailable.new(self)
else
# activesupport 2.3 style try
nil
end
end
end
class SafeNil
include Singleton
def method_missing(method, *args, &b)
return nil unless nil.respond_to? method
nil.send(method, *args, &b) rescue nil
end
end
alias DelegateClass_without_safe_nil DelegateClass
def DelegateClass(klass)
c = DelegateClass_without_safe_nil(klass)
c.class_eval do
def _?
self
end
end
c
end
class CallIfAvailable < BlankSlate
def initialize(target)
@target = target
end
def method_missing(name, *args, &b)
@target.send(name, *args, &b) if @target.respond_to?(name)
end
end
module ActiveRecord
module Associations
class AssociationProxy
# we need to make sure we don't trigger AssociationCollections' method_missing
def try(*args, &block)
HoboSupport.hobo_try(self, *args, &block)
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems