Flash messages in Ruby on Rails - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set a flash message in a Rails controller.

Ruby on Rails

flash[:notice] = [1]

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

Arender

Bredirect_to

C:alert

D"Welcome!"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a symbol instead of a string for the message

Trying to call redirect_to instead of setting flash

Using render instead of setting flash

The flash message is set by assigning a string to flash[:notice]. Here, "Welcome!" is the message shown to the user.

2fill in blank

medium

Complete the code to redirect to the home page after setting a flash message.

Ruby on Rails

flash[:alert] = "Access denied"
[1] root_path

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

Aredirect_to

Brender

Cflash.now

Dlink_to

Attempts:

3 left

💡 Hint

Common Mistakes

Using render instead of redirect_to after setting flash

Using flash.now which does not persist after redirect

Using link_to which is for views, not controllers

After setting a flash message, you use redirect_to to send the user to another page, here root_path.

3fill in blank

hard

Fix the error in the code to display a flash message in the view.

Ruby on Rails

<% if flash[:[1]] %>
  <p><%= flash[:notice] %></p>
<% end %>

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

Anotice

Balert

Cmessage

Derror

Attempts:

3 left

💡 Hint

Common Mistakes

Checking for flash[:alert] but displaying flash[:notice]

Using a key that was never set in flash

Not wrapping flash display in an if condition

The condition should check flash[:notice] to match the message displayed inside the paragraph.

4fill in blank

hard

Fill both blanks to create a flash message hash with keys and values.

Ruby on Rails

flash = { [1]: "Success!", [2]: "Error occurred" }

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

A:notice

B"notice"

C:alert

D"alert"

Attempts:

3 left

💡 Hint

Common Mistakes

Using strings instead of symbols for flash keys

Mixing symbols and strings inconsistently

Using keys that are not standard flash keys

Flash keys are symbols like :notice and :alert. Strings like "notice" won't work as expected.

5fill in blank

hard

Fill all three blanks to set a flash message, redirect, and display it in the view.

Ruby on Rails

class UsersController < ApplicationController
  def create
    if @user.save
      flash[[1]] = "User created"
      [2] users_path
    else
      flash.now[[3]] = "Error saving user"
      render :new
    end
  end
end

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

A:notice

Bredirect_to

C:alert

Drender

Attempts:

3 left

💡 Hint

Common Mistakes

Using flash.now for success messages that redirect

Using redirect_to after render

Mixing up :notice and :alert keys

Use flash[:notice] for success messages and flash.now[:alert] for errors shown on the same page. Use redirect_to to go to another page after success.