This guide is an introduction to composite primary keys for database tables.After reading this guide you will be able to: Create a table with a composite primary key Query a model with a composite primary key Enable your model to use a composite primary key for queries and associations Create forms for models that use composite primary keys Extract composite primary keys from controller parameters Use database fixtures for tables with composite primary keys| Ruby on Rails Guides
Public instance methods| edgeapi.rubyonrails.org
This guide covers the configuration and initialization features available to Rails applications.After reading this guide, you will know: How to adjust the behavior of your Rails applications. How to add additional code to be run at application start time.| Ruby on Rails Guides