has_and_belongs_to_many in Ruby on Rails
ActiveRecord allows you to link independent, but related tables in a many-to-many association mapping. This many-to-many mapping is made using a special mapping table. Examples of this: CD library where each album may exist in one or more categories. ACL (access control list) database, where users can have any number of roles, which can have any number of permissions. AccessControlListExample is a
AccessControlListExample in Ruby on Rails
Example for has_and_belongs_to_many: Database schema (PostgreSQL) CREATE TABLE users ( id serial PRIMARY KEY, nick character varying NOT NULL, name character varying, "password" character varying NOT NULL, modified timestamp with time zone DEFAULT now() NOT NULL, created timestamp with time zone DEFAULT now() NOT NULL, "access" timestamp with time zone ); CREATE TABLE roles ( id serial PRIMARY K
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