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Rescue from record not found error instead of showing an exception or white page:

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learn ruby - ruby on rails tutorial - code ruby - 404 when record not found in ruby on rails - ruby example

class ApplicationController < ActionController::Base
  
  # ... your other stuff here 

  rescue_from ActiveRecord::RecordNotFound do |exception|
    redirect_to root_path, 404, alert: 'Record not found'
  end
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