Redirect on Back

Prevent re-submission of a form by redirecting after user hits the back button. For Rails 3.1 and above.

Example Scenario - User Registration

1. User registers by filling in form and hits 'submit'.
2. User wants to change one of his details.
3. User hits 'back'.
4. User changes something and hits 'submit' again.
5. Arrrggg... a new User record has been created instead of updating the existing one.

Installation (Rails 3.1 and higher)

Add this line to your application's Gemfile:

gem 'redirect_on_back'

Then execute:

$ bundle

And then specify the use of the redirect_on_back javascripts in your application.js:

//= require redirect_on_back

Usage

In your controller actions:

 def create
    @user = User.new(params[:user])
    if result = @user.save
      redirect_on_back_to edit_user_path(@user) # If user hits 'back' he'll be redirected to edit_user_path
      redirect_to @user
    else
      render :action => :new
    end
  end

How to Disable

redirect_on_back uses a hidden form field, which it automatically adds to forms. However, it doesn't add the field to forms that point to different domains, so, for instance, it won't interfere with Amazon S3 file uploads.

To manually disable it in a form, add disable_redirect_on_back: true to the data hash of that form:

   form_tag @user, data: {disable_redirect_on_back: true}

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request