Rails%203%20In%20Action

Summary
Now if you refresh this page and attempt to upload two files, you should see that it
works. Does your scenario agree? Let’s find out by running bin/cucumber features/
creating_tickets.feature:38:
1 scenario (1 passed)
18 steps (18 passed)
Yup, all working! Great. You’ve switched the ticket form back to only providing one
file field but providing a link called Add Another File, which adds another file field on
the page every time it’s clicked. You originally had implemented this link using the
:remote option for link_to, but switched to using CoffeeScript when you needed to
pass the number parameter through. A couple of other small changes, and you got it
all working very neatly again!
This is a great point to see how the application is faring before committing. Let’s
run the tests with rake cucumber:ok spec. You should see the following:
46 scenarios (46 passed)
469 steps (469 passed)
# and
30 examples, 0 failures, 13 pending
Awesome! Let’s commit it:
git add .
git commit -m "Provide an 'Add another file link' that uses Javascript
so that users can upload more than one file"
git push
This section showed how you can use JavaScript and CoffeeScript to provide the user
with another file field on the page using some basic helpers. JavaScript is a powerful
language and is a mainstay of web development that has gained a lot of traction in
recent years thanks to libraries such as the two you saw here, jQuery and CoffeeScript,
as well as others such as Prototype and Raphael.
By using JavaScript, you can provide some great functionality to your users. The
best part? Just as you can test your Rails code, you can make sure JavaScript is working
by writing tests that use WebDriver.
9.5 Summary
This chapter covered two flavors of file uploading: single-file uploading and multiplefile
uploading.
You first saw how to upload a single file by adding the file_field helper to your
view, making your form multipart, and using the Paperclip gem to handle the file
when it arrives in your application.
After you conquered single-file uploading, you tackled multiple-file uploading.
You off loaded the file handling to another class called Asset, which kept a record for
each file you uploaded. You passed the files from your form by using nested attributes,
which allowed you to create Asset objects related to the ticket being created through
the form.
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