In Ruby on Rails, "The Flash" is a way to pass temporary messages or data from one action to another, typically from a controller to a view. It allows you to display messages to the user, such as success, error, or notice messages, without having to store them in the session or pass them as parameters.
The Flash works by storing messages in the session, which are then automatically cleared after they are displayed. This ensures that the messages are only displayed once and do not persist across multiple requests.
Here's how you can use The Flash in Ruby on Rails:
Setting Flash Messages
You can set flash messages in your controller actions using the flash hash. For example:
class UsersController < ApplicationController
def create
@user = User.new(user_params)
if @user.save
flash[:success] = "User created successfully!"
redirect_to @user
else
flash.now[:error] = "Error creating user."
render :new
end
end
end
