module Hashie::Extensions::MethodOverridingWriter
MethodOverridingWriter gives you key_name= shortcuts for writing to your hash. It allows methods to be overridden by key_name= shortcuts and aliases those methods with two leading underscores.
Keys are written as strings. Override convert_key if you would like to have symbols or something else.
Note that MethodOverridingWriter also overrides respond_to_missing? such that any method_name= will respond appropriately as true.
@example
class MyHash < Hash include Hashie::Extensions::MethodOverridingWriter end h = MyHash.new h.awesome = 'sauce' h['awesome'] # => 'sauce' h.zip = 'a-dee-doo-dah' h.zip # => 'a-dee-doo-dah' h.__zip # => [[['awesome', 'sauce'], ['zip', 'a-dee-doo-dah']]]
Public Instance Methods
convert_key(key)
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# File lib/hashie/extensions/method_access.rb, line 184 def convert_key(key) key.to_s end
method_missing(name, *args)
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Calls superclass method
# File lib/hashie/extensions/method_access.rb, line 188 def method_missing(name, *args) if args.size == 1 && name.to_s =~ /(.*)=$/ key = Regexp.last_match[1] redefine_method(key) if method?(key) && !already_overridden?(key) return self[convert_key(key)] = args.first end super end
respond_to_missing?(name, include_private = false)
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Calls superclass method
# File lib/hashie/extensions/method_access.rb, line 198 def respond_to_missing?(name, include_private = false) return true if name.to_s.end_with?('=') super end
Protected Instance Methods
already_overridden?(name)
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# File lib/hashie/extensions/method_access.rb, line 205 def already_overridden?(name) method?("__#{name}") end
method?(name)
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# File lib/hashie/extensions/method_access.rb, line 209 def method?(name) methods.map(&:to_s).include?(name) end
redefine_method(method_name)
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# File lib/hashie/extensions/method_access.rb, line 213 def redefine_method(method_name) eigenclass = class << self; self; end eigenclass.__send__(:alias_method, "__#{method_name}", method_name) eigenclass.__send__(:define_method, method_name, -> { self[method_name] }) end