[Rails] I learned about the difference between resources and resources

I'm a beginner with "super" who is struggling with Rails every day. I read it in the text a few weeks ago, and if I use resources for routing, I don't know what it is, but I remember that the action and HTTP method are tied together, and I kept typing resources without knowing the reason.

Of course, there was a moment when I got stuck in such a way & understanding, so I thought I would sit down and face resources (plural) and resources (singular), so I wrote this article.

What are resources (plural) in the first place?

A resource is a row of information stored in a database table. It is a super convenient function that allows you to create a "RESTful" app by defining multiple routes just by writing resources in one line.

If you didn't use resources

routes.rb

Rails.application.routes.draw do
  get 'tweets'     => 'tweets#index'
  get 'tweets/:id' => 'tweets#show'
  get 'tweets/new' => 'tweets#new'
  post 'tweets' => 'tweets#create'
  get 'tweets/:id/edit' => 'tweets#edit'
  patch 'tweets/:id'  => 'tweets#update'
  delete 'tweets/:id' => 'tweets#destroy'
end

I have to manually enter all the descriptions, which is very confusing. With this alone, it seems like it will collapse for about half a day.

So, using the rumored resources, I tried to describe the routing,

routes.rb

Rails.application.routes.draw do
  resources :tweets
end

High end. When I check the terminal,

Terminal

tweets     GET    /tweets(.:format)          tweets#index
           POST   /tweets(.:format)          tweets#create
new_tweet  GET    /tweets/new(.:format)      tweets#new
edit_tweet GET    /tweets/:id/edit(.:format) tweets#edit
tweet      GET    /tweets/:id(.:format)      tweets#show
           PATCH  /tweets/:id(.:format)      tweets#update
           PUT    /tweets/:id(.:format)      tweets#update
           DELETE /tweets/:id(.:format)      tweets#destroy

Isn't the routing for performing CRUD processing completed brilliantly? This is convenient.

Then what is resource (singular)?

Now here's the guy who bothers me. Actually, there is also a method called resource that describes not only the plural form but also the singular form. Let's check it anyway.

Actually, if you look at the contents of routing using resources,

routes.rb

Rails.application.routes.draw do
  resource :tweet #resource(Singular)に合わせて、モデル名もtweetとSingularにしています！
end

At first glance, the routing looks almost the same. However, if you look at the terminal, you'll notice that there are some differences from when you wrote the resources (plural).

Terminal

new_tweet  GET    /tweet/new(.:format)   tweets#new
edit_tweet GET    /tweet/edit(.:format)  tweets#edit
tweet      GET    /tweet(.:format)       tweets#show
           PATCH  /tweet(.:format)       tweets#update
           PUT    /tweet(.:format)       tweets#update
           DELETE /tweet(.:format)       tweets#destroy
           POST   /tweet(.:format)       tweets#create

Differences between resources and resources

There are two major differences, ① Is there an index action? ② Whether to include: id in url </ strong> is.

Rails.application.routes.draw do
  resources :users do
    get :follows, on: :member
    get :followers, on: :member
  end
end

follows_user    GET   /users/:id/follows(.:format)　   users#follows
followers_user  GET   /users/:id/followers(.:format) 　users#followers
#Below, 7 actions are omitted

Rails.application.routes.draw do
  resources :users do
    get :search, on: :collection
  end
end

search_users   GET    /users/search(.:format)    users#search
#Below, 7 actions are omitted