onysHhoips
                   dsh
Reegluaetbiy Am y
     venReilccoert e t id
Actuiby o Ra s h a                          ...
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Active Record Relationships: A Ruby on Rails Cheat Sheet

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Transcript of "Active Record Relationships: A Ruby on Rails Cheat Sheet"

  1. 1. onysHhoips dsh
Reegluaetbiy Am y venReilccoert e t id Actuiby o Ra s h a note: has_many and has_one aR work identically except for the number of relationships. both go on the table/model that does not feature the foreign key belongs to has many create table customers ( create table companies ( id int auto_increment primary key, id int auto_increment primary key, name varchar(75), name varchar(75) company_id int ) ) customers belongs_to :company companies has_many :customers company_id id has and belongs to many create table articles ( create table articles_authors ( create table authors ( id int auto_increment primary key, author_id int, id int auto_increment primary key, name varchar(75), article_id int name varchar(75) body text ) ) ) articles authors has_and_belongs_to_many :authors has_and_belongs_to_many :articles id articles_authors id article_id author_id note: the articles_authors table is implicit due to the two models that call habtm, and it does not require a model of its own. when making implicit mapping tables such as this, it must be named tablea_tableb where a is first in alphabetical order. © 2005 Amy Hoy / amy@infocookie.com / www.slash7.com MIT License — see http://www.slash7.org/cheats/license.html

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