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How to access controller code from HTML 404 page in Ruby? [closed]

I need to execute a few lines of Ruby in the Rails default 404 page.

Is that possible?

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2 Answers
2

I think you cannot do this. 'Cause 404 page is completely out of rails controllers scope. I would recommend to create errors handling controller (something like 'ErrorsController') and add this line to your routes.rb file, to redirect any bad request to this controller:

get '404', to 'errors#page_404'
get '*path' => redirect('404') unless Rails.env.development?


<%= Settings.your.property.path %>

It is not possible on the default error pages in the public directory.
You can create an errors controller then tell Rails to serve those views instead.

$ rails g controller errors not_found

class ErrorsController < ApplicationController
def not_found
render(status: 404)
end
end


Then you can match all routes with /404 (in routes.rb)

match "/404", :to => "errors#not_found", :via => :all


Then tells Rails to use your matching routes in application.rb ...

config.exceptions_app = self.routes


If you want to make it look like the default 404 page just copy over the static 404 file, which includes styles, then delete it.
Now you can use not_found.html.erb to execute ruby.