[RUBY] [Rails] How to decide the destination by "rails routes"

"rails routes" It's good to display this on the terminal, but I couldn't understand how to use it. So I summarized what I wrote in my notebook.

root method

The concept of MVC is needed in programming. When there is a request from the client at that time, define the destination corresponding to the request.


This time I would like to set the first root method.


Rails.application.routes.draw do
  root to: "posts#index"
rake routes(rails routes is also possible)

Prefix Verb   URI Pattern    Controller#Action    
root   GET       /            posts#index                                                                           

How to write root is as follows

root to: 'Controller name#Action name'


'Controller name # Action name' This quotes Controller # Action of rails routes as it is. Then use "" (double quotes) and it's done.

root to: "posts#index" As a result, if you search on google etc. and click HP, the top page will be displayed.

[Rails] How to jump to the view file specified by the link_to method

How to write


= link_to prefix name_path,HTTP method name class name do


 link_to root_path do
 link_to "Our Blog", root_path, class: "header__title--text" do
 link_to "New post", new_post_path, class: "header__right--btn" do

Below is the result from the rails routes terminal

Prefix     Verb      URI Pattern      Controller#Action
  root     GET          /                posts#index
  posts    POST     /posts(.:format)     posts#create
  new_post GET     /posts/new(.:format)   posts#new

What is an HTTP method?

GET means to display the form and DELETE means to delete. Please refer to the following. The location is described in Verb in rails routes. “スクリーンショット” 2020-10-20 15.55.07.jpg

However, if the Prefix is the same, it will be omitted from the second line. “スクリーンショット” 2020-10-20 15.02.03.jpg

In this case, if you do not specify method :: HTTP method name, an error will occur, so be sure to describe it.


<%= link_to 'Edit', tweet_path(@tweet.id), method: :get %>
<%= link_to 'Delete', "/tweets/#{@tweet.id}", method: :delete %>

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