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
Intermittent cache reloading issue
Reproduce the error.
get /carts/wibble
get http://localhost:3000/
Pragmatic Bookshelf
Invalid cart
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Inspect the log.
tail -25 log/development.log
Rendered /home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (22.5ms)
Started GET "/" for 127.0.0.1 at Thu Oct 11 03:13:38 -0400 2012
Connecting to database specified by database.yml
Processing by StoreController#index as */*
Product Load (0.3ms) *[1mSELECT "products".* FROM "products" ORDER BY title*[0m
Rendered store/index.html.erb within layouts/application (122.1ms)
Completed 200 OK in 246ms (Views: 214.4ms | ActiveRecord: 2.3ms)
Started GET "/carts/wibble" for 127.0.0.1 at Thu Oct 11 03:13:39 -0400 2012
Processing by CartsController#show as HTML
Parameters: {"id"=>"wibble"}
Cart Load (0.3ms) SELECT "carts".* FROM "carts" WHERE "carts"."id" = ? LIMIT 1 [["id", "wibble"]]
Attempt to access invalid cart wibble
Redirected to http://localhost:3000/
Completed 302 Found in 6ms (ActiveRecord: 0.7ms)
Started GET "/" for 127.0.0.1 at Thu Oct 11 03:13:39 -0400 2012
Processing by StoreController#index as HTML
Product Load (0.3ms) *[1mSELECT "products".* FROM "products" ORDER BY title*[0m
Rendered store/index.html.erb within layouts/application (8.0ms)
Completed 200 OK in 20ms (Views: 19.0ms | ActiveRecord: 0.3ms)
10.3 Iteration E3: Finishing the Cart 10.1 Iteration E1: Creating a Smarter Cart