Module: OrbitalFields::Tokenize::ClassMethods

Defined in:
lib/orbital_fields/tokenize.rb

Instance Method Summary collapse

Instance Method Details

#tokenize_associations(*args) ⇒ Object 



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# File 'lib/orbital_fields/tokenize.rb', line 12

def tokenize_associations(*args)
  set_callback :save, :after, :tokenize_callback
  association_symbols = []
  tokenize = args.extract_options!
  tokenize.each do |key, val|
    args << {key => val}
  end
  args.each do |association|
    raise TypeError, "Argument is not a symbol or hash" unless association.class == Symbol || association.class == Hash
    if association.class == Hash
      association_hash = association
      association = association.keys[0]
      raise ArgumentError, "If an argument is a hash, it must have a key named 'display'" unless association_hash[association].has_key?(:display)
      association_display = association_hash[association][:display]
      raise TypeError, "Display argument is not a symbol" unless association_display.class == Symbol
    end

    unless self.current_class.associations.include?(association.to_s)
      raise NoMethodError, "Argument '#{association.to_s}' is not a defined association in the #{self.current_class} class"
    end
    
    association_symbols << association
    
    association_display ||= :name
    
    association_class =  Kernel.const_get(self.current_class.associations[association.to_s].class_name)
    
    unless association_class.attribute_method?(association_display)
      raise ArgumentError, "The #{association_class} class does not have a '#{association_display}' attribute"
    end
    
    setter_method_name = "#{association.to_s.singularize}_tokens="
    getter_method_name = "#{association.to_s.singularize}_tokens"
    json_method_name = "#{association.to_s.singularize}_tokens_json"
    
    define_method(setter_method_name) do |tokens|
      if tokens.blank?
        eval("@#{getter_method_name} = []")
      else
        id_array = tokens.split(",")
        id_array = id_array.uniq
        instance_variable_set("@#{getter_method_name}", id_array)
      end
    end unless method_defined? setter_method_name
    
    define_method(getter_method_name) do
      eval("@#{getter_method_name} ||= []")
      return eval("@#{getter_method_name}.join(',')") unless eval("@#{getter_method_name}.blank?")
      return "" if eval("#{association.to_s}.blank?")
      eval("#{association.to_s}.map(&:id).join(',')")
    end unless method_defined? getter_method_name
    
    define_method(json_method_name) do
      eval("@#{getter_method_name} ||= []")
      return association_class.where(:_id.in => eval("@#{getter_method_name}")).only(:id,association_display).map(&:attributes).to_json unless eval("@#{getter_method_name}.blank?")
      eval("#{association.to_s}.only(:id, :#{association_display.to_s}).map(&:attributes).to_json")
    end unless method_defined? json_method_name
  end # args.each
  self.token_associations =  association_symbols
end