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"
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
You can get this functionality by including the Ruby Facets gem. Reference the source here:
https://github.com/rubyworks/facets/blob/master/lib/core/facets/cattr.rb
You generally don't need to require all code from the gem. You can selectively require what you want. There are quite a few useful extensions in the gem though.
