MVC architecture in Rails - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a Rails controller named PostsController.

Ruby on Rails

class PostsController < [1]
  def index
    @posts = Post.all
  end
end

Drag options to blanks, or click blank then click option'

AApplicationRecord

BApplicationController

CActiveRecord::Base

DActionController::Base

Attempts:

3 left

💡 Hint

Common Mistakes

Using ApplicationRecord which is for models.

Using ActiveRecord::Base which is for models.

Using ActionController::Base directly instead of ApplicationController.

The controller in Rails inherits from ApplicationController to handle web requests.

2fill in blank

medium

Complete the code to define a model named Post that inherits from the correct Rails class.

Ruby on Rails

class Post < [1]
  validates :title, presence: true
end

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AApplicationRecord

BActiveRecord::Base

CApplicationController

DActionController::Base

Attempts:

3 left

💡 Hint

Common Mistakes

Using ApplicationController which is for controllers.

Using ActionController::Base which is for controllers.

Using ActiveRecord::Base directly instead of ApplicationRecord.

Models in Rails inherit from ApplicationRecord, which itself inherits from ActiveRecord::Base.

3fill in blank

hard

Fix the error in the view code to correctly display all post titles.

Ruby on Rails

<ul>
  <% @posts.[1] do |post| %>
    <li><%= post.title %></li>
  <% end %>
</ul>

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Aselect

Bmap

Ceach

Dcollect

Attempts:

3 left

💡 Hint

Common Mistakes

Using map or collect which return new arrays but don't directly output.

Using select which filters but does not iterate all items.

In Rails views, each is used to loop through collections for display.

4fill in blank

hard

Fill both blanks to complete the route that maps GET requests for posts to the index action.

Ruby on Rails

Rails.application.routes.draw do
  [1] '[2]', to: 'posts#index'
end

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Aget

Bpost

Cposts

Dindex

Attempts:

3 left

💡 Hint

Common Mistakes

Using post instead of get for a read route.

Using 'index' as the path instead of the resource name.

The get method defines a route for GET requests, and 'posts' is the URL path.

5fill in blank

hard

Fill all three blanks to complete a controller action that creates a new Post and redirects to its show page.

Ruby on Rails

def create
  @post = Post.new([1])
  if @post.[2]
    redirect_to [3], notice: 'Post was successfully created.'
  else
    render :new
  end
end

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Apost_params

Bsave

C@post

Dupdate

Attempts:

3 left

💡 Hint

Common Mistakes

Using update instead of save in create action.

Redirecting to a path string instead of the post object.

Passing raw params instead of permitted parameters.

The post_params method provides safe parameters, save saves the record, and @post is used to redirect to the show page.