| |
Step 5 Create a model |
|
|
Subject: Step 5 Create a model
Author: Linux
In response to: Step 4 -- Generate the resource's components: controller, actions and views
Posted on: 09/13/2017 01:21:04 AM
To create a new model, run this command:
administrator@ubuntu:~/blog$ rails generate model Post title:string text:text
Running via Spring preloader in process 44241
invoke active_record
create db/migrate/20170912222917_create_posts.rb
create app/models/post.rb
invoke test_unit
create test/models/post_test.rb
create test/fixtures/posts.yml
This is going to do: Create a model Post inside file app/models/post.rb
class Post < ApplicationRecord
end
Generate a database instruction file db/migrate/20170912222917_create_posts.rb
class CreatePosts < ActiveRecord::Migration[5.1]
def change
create_table :posts do |t|
t.string :title
t.text :text
t.timestamps
end
end
end
to create a table posts with a title column of type string and a text column of type text, together with timestamps
Map the model Psot with the database table posts
>
> On 09/12/2017 08:35:40 PM Linux wrote:
First generate the controller PostsController:
administrator@ubuntu:~/blog$ rails generate controller Posts
Running via Spring preloader in process 43022
create app/controllers/posts_controller.rb
invoke erb
create app/views/posts
invoke test_unit
create test/controllers/posts_controller_test.rb
invoke helper
create app/helpers/posts_helper.rb
invoke test_unit
invoke assets
invoke coffee
create app/assets/javascripts/posts.coffee
invoke scss
create app/assets/stylesheets/posts.scss
Then, the CRUD actions:
new -- to bring a new page with form to create a new post
create -- to create a new post based on the parameters from form
show -- to display a post
index -- to display a list of all posts
edit -- to bring a updatable page to edit
update -- to update a post based on the parameter from edit
destroy -- to delete a post
app/controllers/posts_controller.rb
class PostsController < ApplicationController
def new
end
def create
render plain: params[:post].inspect
end
def show
end
def index
end
def edit
end
def update
end
def destroy
end
end
Finally the corresponding views:
app/views/posts/new.html.erb
<h1>New Post</h1>
<%= form_for :post, url: posts_path do |f| %>
<p>
<%= f.label :title %><br>
<%= f.text_field :title %>
</p>
<p>
<%= f.label :text %><br>
<%= f.text_area :text %>
</p>
<p>
<%= f.submit %>
</p>
<% end %>
This tells form's action going to url: posts_path which defaults to posts#create
def create
render plain: params[:post].inspect
end
This prints on browser the following:
<ActionController::Parameters {"title"=>"My First Post", "text"=>"This post to tell how to do ..."} permitted: false>
For sure, we need more than just display -- to save the post into a DB storage.
References:
|
|
|
|
