Module: Hashie::Extensions::MethodQuery

Defined in:
lib/hashie/extensions/method_access.rb

Overview

MethodQuery gives you the ability to check for the truthiness of a key via method calls. Note that it will return false if the key is set to a non-truthful value, not if the key isn't set at all. Use #key? for checking if a key has been set.

MethodQuery will check against both string and symbol names of the method for existing keys. It also patches #respond_to to appropriately detect the query methods.

Examples:

class MyHash < Hash
  include Hashie::Extensions::MethodQuery
end

h = MyHash.new
h['abc'] = 123
h.abc? # => true
h['def'] = nil
h.def? # => false
h.hji? # => NoMethodError

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args) ⇒ Object 



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# File 'lib/hashie/extensions/method_access.rb', line 104

def method_missing(name, *args)
  if args.empty? && name.to_s =~ /(.*)\?$/ && (key?(Regexp.last_match[1]) || key?(Regexp.last_match[1].to_sym))
    return self[Regexp.last_match[1]] || self[Regexp.last_match[1].to_sym]
  end

  super
end

Instance Method Details

#respond_to?(name, include_private = false) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/hashie/extensions/method_access.rb', line 99

def respond_to?(name, include_private = false)
  return true if name.to_s =~ /(.*)\?$/ && (key?(Regexp.last_match[1]) || key?(Regexp.last_match[1].to_sym))
  super
end