Custom Error Handling with Rails 4.0

Question

I\'m building a Ruby on Rails api using Ruby 2.0 and Rails 4.0. My app is almost solely a JSON API, so if an error occurs (500, 404), I want to capture that error and return

Answer 1

After trying a few variations I've settle on this as the simplest way to handle the API 404s:

# Passing request spec
describe 'making a request to an unrecognised path' do
  before { host! 'api.example.com' }
    it 'returns 404' do
    get '/nowhere'
    expect(response.status).to eq(404)
  end
end

# routing
constraints subdomain: 'api' do
  namespace :api, path: '', defaults: { format: 'json' } do
    scope module: :v1, constraints: ApiConstraints.new(1) do
      # ... actual routes omitted ...
    end
    match "*path", to: -> (env) { [404, {}, ['{"error": "not_found"}']] }, via: :all
  end
end