Ruby on Rails - Ruby on Rails Scaffolding - ruby on rails tutorial - rails guides - rails tutorial - ruby rails
What is a scaffold in rails?
- Scaffolding in Ruby on Rails refers to the auto generation of a simple set of a model, views and controller usually for a single table.
- For example: user@localhost$./scripts/generate scaffold users.
- Would create a full CRUD (create, read, update, delete) web interface for the Users table.
- Scaffolding is a quick way to produce some major pieces of an application.
- For auto generating a set of models, views and controllers for a new resource in a single operation, scaffolding is used.
Some benefits of Scaffolding
- You can quickly get code in front of your users for feedback.
- You are motivated by faster success.
- You can learn how Rails works by looking at the generated code.
- You can use scaffolding as a foundation to jump start your development.
Nested Scaffold
Nested scaffold is the command that generates a set of perfectly working nested resource for Rails 4.2 and 5.
Features:
- Generates a nested child resource with a single command
- Generates a beautifully working bunch of code
- Automatically generates appropriate model associations for ActiveRecord
- Haml ready
Syntax:
To install nested scaffold, use the following command.
gem 'nested_scaffold' Clicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team
| File | Purpose |
|---|---|
| db/migrate/20100207214725_create_posts.rb | Creates the post table in your database |
| app/models/post.rb | The Post model |
| test/unit/post_test.rb | Unit testing harness for posts model |
| test/fixtures/posts.yml | Sample posts for use in testing |
| config/routes.rb | Edited to include routing information for posts |
| app/controllers/posts_controller.rb | The posts controller |
| app/views/posts/index.html.erb | A view to display index of all posts |
| app/views/posts/edit.html.erb | A view to edit an existing post |
| app/views/posts/show.html.erb | A view to display a single post |
| app/views/posts/new.html.erb | A view to create a new post |
| app/views/posts/_form.html.erb | A partial to control the overall look and feel of the form used in edit and new views |
| test/functional/post_controller_test.rb | Functional testing harness for posts controller |
| app/helpers/posts_helper.rb | Helper functions to be used from the post views |
| test/unit/helpers/posts_helper_test.rb | Unit testing harness for the posts helper |
| app/assets/javascripts/posts.js.coffee | Coffee script for post controller |
| app/assets/stylesheets/posts.css.scss | Cascading style sheet for post controller |
| app/assets/stylesheets/scaffolds.css.scss | Cascading style sheet to make scaffolded views look better |
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Creating a Resource:
- To generate a scaffold for the post resource, enter the following command:
- rails generate scaffold Post name:string title:string content:text
- The scaffold generator will build several files in your application with some folders.
- Following files will be created with scaffolding.
Many experienced developers avoid scaffolding, instead prefer to write all or most of their source code from scratch. Because its automatically generated code may not fit into your application.
Scaffold Example:
Let us generate following example with scaffold.
Step 1:
Create an application
- rails new example
Step 2:
In the example application, create MVC components.
- cd example
- rails generate scaffold post title:string body:text
- rails generate scaffold comment post_id:integer body:text
From the above code, first move to the application directory.
Step 3:
Create database tables comments and post_id.
rake db:migrate
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Step 4:
Use rake command to run migrations.
rake routes
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Step 5:
Start the web server
rails server
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Output:
Run http://localhost:3000/posts in your browser.
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Go to New Post
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Click on Create.
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Click on Edit.
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Click on Update.
