Rails: How to run `rails generate scaffold` when the model already exists?

by

TL;DR: rails g scaffold_controller <name>

Even though you already have a model, you can still generate the necessary controller and migration files by using the rails generate option. If you run rails generate -h you can see all of the options available to you.

Rails:
  controller
  generator
  helper
  integration_test
  mailer
  migration
  model
  observer
  performance_test
  plugin
  resource
  scaffold
  scaffold_controller
  session_migration
  stylesheets

If you’d like to generate a controller scaffold for your model, see scaffold_controller. Just for clarity, here’s the description on that:

Stubs out a scaffolded controller and its views. Pass the model name,
either CamelCased or under_scored, and a list of views as arguments.
The controller name is retrieved as a pluralized version of the model
name.

To create a controller within a module, specify the model name as a
path like ‘parent_module/controller_name’.

This generates a controller class in app/controllers and invokes helper,
template engine and test framework generators.

To create your resource, you’d use the resource generator, and to create a migration, you can also see the migration generator (see, there’s a pattern to all of this madness). These provide options to create the missing files to build a resource. Alternatively you can just run rails generate scaffold with the --skip option to skip any files which exist 🙂

I recommend spending some time looking at the options inside of the generators. They’re something I don’t feel are documented extremely well in books and such, but they’re very handy.

More Related Contents:

  1. ActiveRecord OR query
  2. ActiveRecord: size vs count
  3. How can I disable logging of asset pipeline (sprockets) messages in Ruby on Rails 3.1?
  4. How to chain scope queries with OR instead of AND?
  5. When to use a “has_many :through” relation in Rails?
  6. rake db:schema:load vs. migrations
  7. incompatible character encodings: ASCII-8BIT and UTF-8
  8. Alias for column names in Rails
  9. Rails 3 devise, current_user is not accessible in a Model ?
  10. STI, one controller
  11. Rails 3: How to “redirect_to” in Ajax call?
  12. Paginating an Array in Ruby with will_paginate
  13. Purge or recreate a Ruby on Rails database
  14. Rails 3 equivalent for periodically_call_remote
  15. Convert HTML to word file ?
  16. SimpleForm without for (non model form)
  17. Ruby on Rails 3 – Reload lib directory for each request
  18. How to change a Ruby on Rails application name?
  19. Ruby: problem installing EventMachine under Windows 7
  20. How to configure Log4r with Rails 3.0.x?
  21. Ruby on Rails Callback, what is difference between :before_save and :before_create?
  22. Rails: FATAL – Peer authentication failed for user (PG::Error)
  23. How do I extract Rails view helpers into a gem?
  24. Passing variables inside rails internationalization yml file
  25. Rails 3 – Speed up Console Loading Time
  26. How to make Devise redirect after confirmation
  27. Rails devise: user_signed_in? not working
  28. rails 3 has_many :through Form with checkboxes
  29. Customizing Devise error messages in Rails 3?
  30. How to create app-wide slug routing for Rails app?

Leave a Comment