cattr_accessor 位于 Rails 之外

发布于 2024-09-05 08:58:42 字数 287 浏览 7 评论 0原文

我正在尝试使用 google_search ruby 库（代码如下），但它抱怨 'cattr_accessor 是一个未定义的方法' - 你知道为什么会这样或者我如何修复它吗？

require 'rubygems'
require 'google_search'

GoogleSearch.web :q => "pink floyd"

原文

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"

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無處可尋 2024-09-12 08:58:42

cattr_accessor 似乎是一个 Rails 扩展，其行为类似于 attr_accessor ，但可以在类及其实例上访问。

如果您想复制 cattr_accessor 方法的源代码，请查看本文档：

# 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

cattr_accessor seems to be a Rails extension that acts like attr_accessor, but is accessible on both the class and its instances.

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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