How to redirect to a 404 in Rails?
http, http-status-code-404, ruby, ruby-on-rails
Solution
Don't render 404 yourself, there's no reason to; Rails has this functionality built in already. If you want to show a 404 page, create a `render_404` method (or `not_found` as I called it) in `ApplicationController` like this:
def not_found
raise ActionController::RoutingError.new('Not Found')
end
Rails also handles `AbstractController::ActionNotFound`, and `ActiveRecord::RecordNotFound` the same way.
This does two things better:
1) It uses Rails' built in `rescue_from` handler to render the 404 page, and 2) it interrupts the execution of your code, letting you do nice things like:
user = User.find_by_email(params[:email]) or not_found
user.do_something!
without having to write ugly conditional statements.
As a bonus, it's also super easy to handle in tests. For example, in an rspec integration test:
# RSpec 1
lambda {
visit '/something/you/want/to/404'
}.should raise_error(ActionController::RoutingError)
# RSpec 2+
expect {
get '/something/you/want/to/404'
}.to raise_error(ActionController::RoutingError)
And minitest:
assert_raises(ActionController::RoutingError) do
get '/something/you/want/to/404'
end
OR refer more info from Rails render 404 not found from a controller action
Problem
I'd like to 'fake' a 404 page in Rails. In PHP, I would just send a header with the error code as such: ``` header("HTTP/1.0 404 Not Found"); ``` How is that done with Rails?