liufengyun/jobsworth — comment on commit 5532e671f88c821685f34594aff1aa64b2ee0db3
File:  line 0
By liufengyun:

This commit and the comment are incorrect and misleading, thus should be ignored.

For the code below, the "ruby" tag will get saved automatically:
@post = Post.first
@post.tags.build :name => "ruby"
@post.save

The following code works as well(no @post.save needed).
@post = Post.first
@post.tags << Tag.new(:name => "ruby")