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Table articles has column: author,body,etc Table users has column: login_name,email,etc articles belongs_to user users has many articles foreign_key author references users(login_name) Therefore in Article.rb: belongs_to:article_user, :class_name=>"User", :foreign_key=>"author" and what''s going on? how the rails find the reference relationship between articules(author) and users(login_name)? -- Posted via http://www.ruby-forum.com/.