autocomplete in gvim for ruby

It is possible to setting up autocomplete menu in gvim? For example in ruby file, when I type a name of object, object1.<C-P>, I want to see attributes and methods of this object1, but vi开发者_StackOverflow社区m load in menu all words from file.

<C-p> and <C-n> complete with words in the active buffers.

<C-x><C-o> completes methods and properties.

<C-x><C-l> completes whole lines.

<C-x><C-f> completes file names.

:help ins-completion