Module: AttrExtras::ClassMethods

Included in:
Class
Defined in:
lib/attr_extras.rb

Instance Method Summary collapse

Instance Method Details

#attr_id_query(*names) ⇒ Object 



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# File 'lib/attr_extras.rb', line 42

def attr_id_query(*names)
  names.each do |name|
    name = name.to_s

    raise "#{__method__} wants `#{name}?`, not `#{name}`." unless name.end_with?("?")

    define_method(name) do       # def foo?
      !!send("#{name.chop}_id")  #   !!send("foo_id")
    end                          # end
  end
end

#attr_initialize(*names) ⇒ Object 



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# File 'lib/attr_extras.rb', line 5

def attr_initialize(*names)
  define_method(:initialize) do |*values|
    unless values.length == names.length
      raise ArgumentError, "wrong number of arguments (#{values.length} for #{names.length})"
    end

    names.zip(values).each do |name_or_names, value|
      if name_or_names.is_a?(Array)
        name_or_names.each do |key|
          instance_variable_set("@#{key}", value[key])
        end
      else
        instance_variable_set("@#{name_or_names}", value)
      end
    end
  end
end

#attr_private(*names) ⇒ Object 



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# File 'lib/attr_extras.rb', line 23

def attr_private(*names)
  attr_reader *names
  private *names
end

#method_object(method_name, *names) ⇒ Object 



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# File 'lib/attr_extras.rb', line 33

def method_object(method_name, *names)
  metaclass = (class << self; self; end)
  metaclass.send(:define_method, method_name) do |*values|
    new(*values).send(method_name)
  end

  pattr_initialize *names
end

#pattr_initialize(*names) ⇒ Object 



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# File 'lib/attr_extras.rb', line 28

def pattr_initialize(*names)
  attr_initialize *names
  attr_private *names.flatten
end