BeforeOr404 <img src=“” alt=“Build Status” /> <img src=“” />

Very simple gem that adds additional filter before_or_404 to ActionController::Base. It behaves just as a regular before_filter but in a case when error raises in the filter it returns 404 page with 404 status.

Installation

1 Add this line to your application’s Gemfile:

gem 'before_or_404'

2 And then execute:

$ bundle

When to use it

Let’s say you have a restful controller and appropriate url to edit a resource

http://bestsite.com/books/3/edit

And you have a before_filter to avoid duplication

class BooksController < ApplicationController
  before_filter :find_book, :only => [:show, :edit, :update, :destroy]

  ...

  private

  def find_book
    @book = Book.find(params[:id])
  end
end

But what if I manually change the id in the url to one which is invalid

http://bestsite.com/books/just a super book/edit

Then this url considered to be invalid and hence user should see 404 page (“Page not found”) In this case you could do the next

class BooksController < ApplicationController
  before_filter :find_book, :only => [:show, :edit, :update, :destroy]

  ...

  private

  def page_not_found
    render 'public/404', status: 404
  end

  def find_book
    @book = Book.find_by_id(params[:id])
    @book || page_not_found
  end
end

But this meens you should do this in every before_filter where you find a resource by id which comes as a part of url. As alternative you could use before_or_404 instead of before_filter.

Usage Example

class UsersController < ApplicationController
  before_or_404 :find_user, only: [:show, :edit, :destroy]

  ...

  private

  def find_user
    @user = User.find(params[:id])
  end

end

Contributing

1. Fork it

2. Create your feature branch (git checkout -b my-new-feature)

3. Commit your changes (git commit -am 'Added some feature')

4. Push to the branch (git push origin my-new-feature)

5. Create new Pull Request