本文介绍了cattr_accessor在导轨外部的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试使用 google_search ruby库(代码如下),但它抱怨说'cattr_accessor
是未定义的方法"-关于为什么会这样或如何解决的任何想法?
I'm trying to use the google_search ruby library (code follows) but it complains that 'cattr_accessor
is an undefined method' - any ideas why this might be or how I could fix it?
require 'rubygems'
require 'google_search'
GoogleSearch.web :q => "pink floyd"
推荐答案
cattr_accessor
似乎是Rails扩展其作用类似于attr_accessor
,但在类及其实例上均可访问.
cattr_accessor
seems to be a Rails extension that acts like attr_accessor
, but is accessible on both the class and its instances.
如果您要复制cattr_accessor
方法的源,请查看此文档:
If you want to copy the source of the cattr_accessor
method, check out this documentation:
# File vendor/rails/activesupport/lib/active_support/core_ext/class/attribute_accessors.rb, line 46
def cattr_accessor(*syms)
cattr_reader(*syms)
cattr_writer(*syms)
end
# File vendor/rails/activesupport/lib/active_support/core_ext/class/attribute_accessors.rb, line 4
def cattr_reader(*syms)
syms.flatten.each do |sym|
next if sym.is_a?(Hash)
class_eval("unless defined? @@\#{sym}\n@@\#{sym} = nil\nend\n\ndef self.\#{sym}\n@@\#{sym}\nend\n\ndef \#{sym}\n@@\#{sym}\nend\n", __FILE__, __LINE__)
end
end
# File vendor/rails/activesupport/lib/active_support/core_ext/class/attribute_accessors.rb, line 24
def cattr_writer(*syms)
options = syms.extract_options!
syms.flatten.each do |sym|
class_eval("unless defined? @@\#{sym}\n@@\#{sym} = nil\nend\n\ndef self.\#{sym}=(obj)\n@@\#{sym} = obj\nend\n\n\#{\"\ndef \#{sym}=(obj)\n@@\#{sym} = obj\nend\n\" unless options[:instance_writer] == false }\n", __FILE__, __LINE__)
end
end
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