Scaffold: A quickest way of building a blog with posts and comments 2020

In the subsequent chapters we will create more realistic blog. However, before we do that as a warm up, here we'll create a very simple blog which a user can add posts and comments. So, this chapter will be an express course for making a blog.

Rails scaffolding is a quick way to generate some of the major pieces of an application. If we want to create the models, views, and controllers for a new resource in a single operation, scaffolding is the tool for the job.

1. The first thing we need to do is to create the Rails application:
   

   $ rails new blog
   

2. In the blog app directory, use the scaffold generator to create the MVC components needed for posts and comments:

   $ cd blog
   $ rails generate scaffold post title:string body:text
   $ rails generate scaffold comment post_id:integer body:text
   

   Here, we ran a couple of code generators to create The posts as well as the comments.
3. Create the post and comment database tables:
   

   $ rake db:migrate
   

   Migrations are Ruby classes that are designed to make it simple to create and modify database tables. Rails uses rake commands to run migrations

$ rake routes
      Prefix Verb   URI Pattern                  Controller#Action
    comments GET    /comments(.:format)          comments#index
             POST   /comments(.:format)          comments#create
 new_comment GET    /comments/new(.:format)      comments#new
edit_comment GET    /comments/:id/edit(.:format) comments#edit
     comment GET    /comments/:id(.:format)      comments#show
             PATCH  /comments/:id(.:format)      comments#update
             PUT    /comments/:id(.:format)      comments#update
             DELETE /comments/:id(.:format)      comments#destroy
       posts GET    /posts(.:format)             posts#index
             POST   /posts(.:format)             posts#create
    new_post GET    /posts/new(.:format)         posts#new
   edit_post GET    /posts/:id/edit(.:format)    posts#edit
        post GET    /posts/:id(.:format)         posts#show
             PATCH  /posts/:id(.:format)         posts#update
             PUT    /posts/:id(.:format)         posts#update
             DELETE /posts/:id(.:format)         posts#destroy

This "rake routes" lists all the URLs currently recognized by our app.
4. Start the web server:
   

   $ rails server
   

   and then point our browser to: http://localhost:3000/posts
   
   
   If we click 'Create":
   
   
   
   
   
   We can do comment as well:
   
   
   At "Create" button press: