rails_cheat_sheet.md

Rails Cheat Sheet

Basics

• $ rails new foo: Generate a new project called "foo".
• $ rails s: Start the Rails web server.
• $ rake db:migrate: Run all unapplied migrations.
• $ rake db:rollback: Rollback the last migration.
• $ rake db:migrate:redo: Rollback and reapply the last migration.

Models

• $ rails g model Foo chunky:string bacon:text: Generate the model, migration, tests, etc. for a table "foos" with two columns.

Views

Controllers

• $ rails g controller foo bar: Generate a new controller called "foo", with action "bar".

• Standard CRUD action methods, in conventional order:

  • index
  • show
  • new
  • edit
  • create
  • update
  • destroy

• Helper Methods:

  • params: Returns a hash containing form and query parameters submitted.
  • render: Instructs the view to render the specified content.
  • redirect_to: Redirect the user to a particular action.