10.3 Iteration E3: Finishing the Cart 10.1 Iteration E1: Creating a Smarter Cart
Log errors and show them on the screen.
Rescue error: log, flash, and redirect.
edit app/controllers/carts_controller.rb
# GET /carts/1
# GET /carts/1.json
def show
begin
@cart = Cart.find(params[:id])
rescue ActiveRecord::RecordNotFound
logger.error "Attempt to access invalid cart #{params[:id]}"
redirect_to store_url, notice: 'Invalid cart'
else
respond_to do |format|
format.html # show.html.erb
format.json { render json: @cart }
end
end
end
Reproduce the error.
get /carts/wibble
get http://localhost:3000/
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Invalid cart
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Inspect the log.
tail -25 log/development.log
Cart Load (0.2ms) SELECT "carts".* FROM "carts" WHERE "carts"."id" = ? LIMIT 1 [["id", "wibble"]]
Completed 404 Not Found in 3ms
ActiveRecord::RecordNotFound (Couldn't find Cart with id=wibble):
app/controllers/carts_controller.rb:16:in `show'
Rendered /home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.7ms)
Rendered /home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (1.4ms)
Rendered /home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (6.8ms)
Started GET "/carts/wibble" for 127.0.0.1 at 2011-10-29 03:15:32 -0400
Processing by CartsController#show as HTML
Parameters: {"id"=>"wibble"}
Cart Load (0.2ms) �[1mSELECT "carts".* FROM "carts" WHERE "carts"."id" = ? LIMIT 1�[0m [["id", "wibble"]]
Attempt to access invalid cart wibble
Redirected to http://localhost:3000/
Completed 302 Found in 4ms (ActiveRecord: 0.7ms)
Started GET "/" for 127.0.0.1 at 2011-10-29 03:15:32 -0400
Processing by StoreController#index as HTML
Product Load (0.2ms) SELECT "products".* FROM "products" ORDER BY title
Rendered store/index.html.erb within layouts/application (18.2ms)
Completed 200 OK in 41ms (Views: 28.6ms | ActiveRecord: 1.1ms)
10.3 Iteration E3: Finishing the Cart 10.1 Iteration E1: Creating a Smarter Cart