Module: NestedRespondTo

Defined in:
lib/safe_nested_calls.rb

Instance Method Summary collapse

Instance Method Details

#nested_respond_to?(*methods) ⇒ Boolean

Returns:

  • (Boolean) 


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

def nested_respond_to?(*methods)
  if nil? || methods.empty?
    true
  else
    method = methods.shift
    if self.respond_to?(method)
      self.send(method).nested_respond_to?(*methods)
    else
      false
    end
  end
end

#safe_nested_method(*params) ⇒ Object 



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# File 'lib/safe_nested_calls.rb', line 18

def safe_nested_method(*params)
p = params
if params.respond_to?(:size) && params.size == 1 && params[0].is_a?(Hash)
	p = params[0]
end

if p.empty?
	return self
end

if p.is_a? Array
	name = p.shift
	if name.class != Symbol
		raise ArgumentError, 'Parameters must be symbols'
	end
	if self.respond_to?(name)
		self.send(name).safe_nested_method(*p)
	else
		return nil
	end
elsif p.is_a? Hash
	name, args = p.shift
	if name.class != Symbol
		raise ArgumentError, 'Parameters must be symbols'
	end
	if self.respond_to?(name)
		if args == :none
			self.send(name).safe_nested_method(*[p])
		else
			self.send(name, *args).safe_nested_method(*p)
		end
	else
		return nil
	end
end
end