Routing in Rails - ruby-on-rails

Question

I am new to Ruby on Rails.I am following Rails Guides tutorial. I've built a basic form which takes title and text as an input and stores in the database.
Here is my code:
ArticlesController:
class ArticlesController < ApplicationController
def new
end
def create
#article = Article.new(article_params)
#article.save
redirect_to #article
end
def show
#article = Article.find(params[:id])
end
private
def article_params
params.require(:article).permit(:title, :text)
end
end
routes.rb:
Rails.application.routes.draw do
get 'welcome/index'
root 'welcome#index'
resources :articles
end
new.html.erb(the form):
<h1>New article</h1>
<%= form_with scope: :article, url: articles_path, local: true do |form| %>
<p>
<%= form.label :title %><br>
<%= form.text_field :title %>
</p>
<p>
<%= form.label :text %><br>
<%= form.text_area :text %>
</p>
<p>
<%= form.submit %>
</p>
After I click submit button of the form, I am taken to the show view where I display the data of the form. But I am not able to understand how exactly this is happening? Nowhere have I mentioned to render the show.html view, so how does Rails understand which view I have to render? I am a bit confused with this.
Note: I come from a Django background, so how I would implement routing in Django is by defining the required method(from views.py) in my urls.py for the corresponding route. Then I would render the template defined in the method in views.py.

Answer 1

You have defined resources :articles on your config/routes.rb file which is a rails helper method that generates the following routes when you run rake routes | grep articles on your terminal shell
articles GET /articles(.:format) articles#index
POST /articles(.:format) articles#create
new_article GET /articles/new(.:format) articles#new
edit_article GET /articles/:id/edit(.:format) articles#edit
article GET /articles/:id(.:format) articles#show
PATCH /articles/:id(.:format) articles#update
PUT /articles/:id(.:format) articles#update
DELETE /articles/:id(.:format) articles#destroy
The statement redirect_to #article at the end of def create ... end block is translated by rails to 'redirect_to /articles/#article.id' which is responsible for redirecting the response to articles#show action defined in app/controllers/articles_controller.rb

Answer 2

rails g scaffold article title:string text:string
run above command and you will get complete application what you are looking for.
You will understand what is needed in routes.

Answer 3

Please complete the routes guide
But for now as
article GET /articles/:id(.:format)
and in your create action in the last line you wrote
redirect_to #article
which leads to you to the /articles/:id of the instance variable #article

Answer 4

From your code
def create
#article = Article.new(article_params)
#article.save
redirect_to #article
end
after #article is successfully saved, you are redirecting it to show action by specifying redirect_to #article
If you do rake routes
article GET /article/:id(.:format) articles#show
so the actual route for show action is article_path(#article).You can redirect to the show action by writing redirect_to article_path(#article) or even if you simply pass an object (#article) to redirect_to method, rails will redirect it to the corresponding show action because of syntactic sugar of redirect_to url_for(#page)