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Rails's redirect_to

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Rails's redirect_to

In this article, we take an up-close-and-personal look at the Rails framework by getting into the nitty-gritty of this particular functionality.

· Web Dev Zone ·
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Rails's redirect_to takes two parameters, option and response_status  (optional). It redirects the browser to the target specified in options.

This parameter can be:

  • Hash - The URL will be generated by calling url_for with the options.
    • redirect_to action: 'show', id: 2

  • Record - The URL will be generated by calling url_for with the options.
    • redirect_to article

  • A string starting with the protocol - // (like http: //) - is passed straight through as the target for redirection.
    • redirect_to 'http://www.rubyonrails.org'

  • A string not containing a protocol, the current protocol, and the host are prepended to the string.

redirect_to '/images/screenshot.jpg'

  • A helper method generated by Rails (most commonly used).
    • redirect_to articles_url

  • :back - Back to the page that issued the request. Useful for forms that are triggered from multiple places.
    • redirect_to :back

The redirection happens as a "302 Moved" header unless otherwise specified.

redirect_to profile_url(@profile), :status => :moved_permanently
redirect_to profile_url(@profile), :status => 302

Note: You should always use named code because it is more readable. Be sure to check other status codes.

If needed, you can also specify a controller and an action.

  • redirect_to :controller => 'article', :action => 'index'

You can specify the format, too (in case you need to redirect a request coming in one format to another format).

  • redirect_to :action => 'show', :format => 'html'

Redirect to your main page, just make sure to configure to root route first.

  • redirect_to :root

Also, redirect_to does not stop the execution of the function. To terminate the execution of the function immediately after redirect_to, use return.

  • redirect_to article_url(@article) and return

Display a Flash Message On Redirect

The most elegant way to achieve this is to use a helper method in ApplicationController and declare which types of flash messages you want to use. For example:

class ApplicationController < ActionController::Base
  ...
  add_flash_types :success, :error
  ...
end

Then, use it in your controller actions like this:

  • redirect_to articles_path, success: 'Article is successfully created'

Passing Parameters in redirect_to

If you need to pass additional parameters, just add it to helper method:

  • redirect_to article_path(@article, param: 'foo')

The above code will create this path:

  • "/articles/1?param=foo"

Or, if you want to specify the exact controller and action, do the following:

  • redirect_to controller: 'articles', action: 'show', id: 1, param: 'foo'

The above will generate the same path.

Now, you can access it in the responding action and do what you intended with it:

def show
  @param = params[:param]
  ...
end

Redirect to Subdomain

If you're looking to redirect to a subdomain try this:

  • redirect_to article_url(@article, subdomain: 'sub')

Difference Between _url and _path

The main difference between _url and _path is:

  • _urlwill give you the absolute URL path, containing the protocol, host, and port. For example, http://localhost:3000/articles.
  • _path will return the relative path, which is given without the domain, protocol, etc. So it would just be /articles.

Use redirect_back Instead of redirect_to: back

Rails 5 provides a redirect_back function to redirect the user to HTTP_REFERER. When HTTP_REFERER is not present, it redirects to the user whatever is passed in as fallback_location.

  • redirect_back(fallback_location: root_path)

You can pass in a notice, too:

  • redirect_back(fallback_location: root_path, notice: "Your message")

The Difference Between redirect_to and Render

Redirect is telling the browser it needs to make a new request to a different location. Render does not change the URL of the page you are visiting.

Conclusion

Thank you for reading this article, we hope we were able to help!

References:
https://apidock.com/rails/ActionController/Base/redirect_to
http://api.rubyonrails.org/classes/ActionController/Redirecting.html
https://tosbourn.com/difference-between-redirect-render- rails /
https://blog.bigbinary.com/2016/02/29/rails-5-improves-redirect_to_back-with-redirect-back.html
https://stackoverflow.com/questions/2350539/what-is-the -difference-between-url-and-path-while-using-the-routes-in-rails

Deploying code to production can be filled with uncertainty. Reduce the risks, and deploy earlier and more often. Download this free guide to learn more. Brought to you in partnership with Rollbar.

Topics:
ruby on rails ,web dev ,ruby ,rails web development

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