Action methods in Ruby on Rails - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define an action method named show in a Rails controller.

Ruby on Rails

class ProductsController < ApplicationController
  def [1]
    # code to show a product
  end
end

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

Ashow

Bdisplay

Cindex

Drender

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-standard method name like display.

Confusing show with index which lists all items.

The show method is a standard Rails action used to display a single resource.

2fill in blank

medium

Complete the code to render the index view in the index action method.

Ruby on Rails

class ArticlesController < ApplicationController
  def index
    @articles = Article.all
    [1]
  end
end

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

Arender 'show'

Bredirect_to articles_path

Credirect_to index

Drender :index

Attempts:

3 left

💡 Hint

Common Mistakes

Using redirect_to instead of render when showing a view.

Rendering the wrong template like 'show'.

Using render :index explicitly tells Rails to show the index view template.

3fill in blank

hard

Fix the error in the create action by completing the code to save a new Post.

Ruby on Rails

class PostsController < ApplicationController
  def create
    @post = Post.new(post_params)
    if @post.[1]
      redirect_to @post
    else
      render :new
    end
  end
end

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

Aupdate

Bsave!

Csave

Dcreate

Attempts:

3 left

💡 Hint

Common Mistakes

Using save! which raises errors instead of returning false.

Using create which is a class method, not an instance method.

The save method attempts to save the record and returns true or false depending on success.

4fill in blank

hard

Fill both blanks to define a destroy action that finds a User by id and deletes it.

Ruby on Rails

class UsersController < ApplicationController
  def destroy
    @user = User.[1](params[:[2]])
    @user.destroy
    redirect_to users_path
  end
end

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

Afind

Bid

Cfind_by

Duser_id

Attempts:

3 left

💡 Hint

Common Mistakes

Using find_by without specifying the correct key.

Using user_id instead of id in params.

find fetches a record by its primary key, which is usually id.

5fill in blank

hard

Fill all three blanks to define an update action that finds a Comment, updates it with permitted params, and redirects to the comment.

Ruby on Rails

class CommentsController < ApplicationController
  def update
    @comment = Comment.[1](params[:[2]])
    if @comment.[3](comment_params)
      redirect_to @comment
    else
      render :edit
    end
  end
end

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

Afind

Bid

Cupdate

Dsave

Attempts:

3 left

💡 Hint

Common Mistakes

Using save instead of update which requires manual attribute assignment.

Using wrong param key like comment_id instead of id.

find locates the record by id, and update applies changes and saves if valid.