Ruby On Rails

• Notes on the learning process

• .erb, .scss, .coffee, etc. are file extensions used for processing the files.

  • For example, if you have a file called hoo.html.erb.coffee, it will be processed by coffee, then by erb, and the final output will be hoo.html.

• Controllers are in plural form (UsersController), while models are in singular form (User).

• In Rails, REST automatically converts to corresponding actions (e.g., GET -> show).

  • If you define resources :users in routes.rb, it maps to the RESTful actions for /users.

• Regarding the database

  • Model.update_attribute can bypass validations.
    • update_attributes cannot.
  • If the parameter is indexed, it can be searched without performing a full scan.

• About testing

  • Use assert to check true/false.
  • Use assert_XXX format, such as assert_select or assert_response.

• Regarding gems

  • Clearing the cache can sometimes solve issues.
  • The order in which gems are listed in the Gemfile can also affect functionality. For example, Bootstrap may not work if jQuery is not placed before it.