Halt!

Sometimes we don't want a request to continue executing; maybe an error has occurred or perhaps an operation is taking too long and we would like to abort the execution of the request. Maze provides a halt! method to controllers.

When you want a request to cease and return a particular message rather then rendering a page, you use Maze halt! to stop the request from continue execution.

class UserController < ApplicationController
  def index
    halt(404, "Forbiden") if params[:user_id].nil?
    reder "index.slang"
  end
end

A status code of 404 was returned, and the content in render will not be delivered to the client.

The next time you’re building a Maze application, consider using halt to simplify error handling.

Halt! and redirect_to

Unlike other frameworks Maze redirect_to stops the current execution of the request and performs the redirection at that given time.

For example, in other frameworks you will have to do something similar to:

class UserController < ApplicationController
  def index
    if some_condition
        if some_condition
            redirect_to(path_one) and return
            # Or another approach
            return redirect_to(path_one)
        end
    end
  end
end

As you probably noticed there is an explicit return, this explicit return is something that is not needed with Maze. Since redirect_to uses the halt! method in the background.