Module: Enumerable

Defined in:
lib/enumerable-ext.rb

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_id, *arguments) ⇒ Object

Add dynamic attribute-based selectors. Ex:

[{:name=>'Guy',:last_name=>'Shmuely'},
 {:name=>'Jack',:last_name=>'Sperow'}].find_by_name_and_last_name('Guy','Shmuely')
=> [{:name=>'Guy',:last_name=>'Shmuely'}]
[{:name=>'Guy',:last_name=>'Shmuely',:age=>25},
 {:name=>'Jack',:last_name=>'Sperow'},
 {:name=>'Roobin'}].collect_name_and_last_name
=> [['Guy','Shmuely'],['Jack','Sperow'],['Roobin',nil]]



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# File 'lib/enumerable-ext.rb', line 12

def method_missing(method_id, *arguments)
  if match = /collect_([_a-zA-Z]\w*)/.match(method_id.to_s)
    attributes = match.captures.last.split('_and_')
    collection = self.collect{|array| attributes.collect{|attr| (array.is_a?(Array) || array.is_a?(Hash)) ? array[attr.to_sym] : array.send(attr.to_sym)}}
    collection.flatten! if attributes.size == 1
    collection
  elsif match = /select_by_([_a-zA-Z]\w*)/.match(method_id.to_s)
    attribute_names = match.captures.last.split('_and_')
    select do |element|
      flag=true
      attribute_names.each_with_index { |name, idx| value=(element.is_a?(Array) || element.is_a?(Hash)) ? element[name.to_sym] : element.send(name)
                                        flag=false unless value==arguments[idx] }
      flag
    end
  else
    super
  end
end