There’s a subtle difference between flash
and flash.now
. The flash
variable is designed to be used before a redirect, and it persists on the resulting page for one request—that is, it appears once, and disappears when you click on another link. Unfortunately, this means that if we don’t redirect, and instead simply render a page (as in Listing 9.8), the flash message persists for two requests: it appears on the rendered page but is still waiting for a “redirect” (i.e., a second request), and thus appears again if you click a link.
To avoid this weird behavior, when render
ing rather than redirect
ing we use flash.now
instead of flash
. The flash.now
object is specifically designed for displaying flash messages on rendered pages. If you ever find yourself wondering why a flash message is showing up where you don’t expect it, chances are good that you need to replace flash
withflash.now
.
发表评论
-
12.3.3 scaling issue of the status feed
2011-10-30 17:54 787the problem of the implementati ... -
12.3 the status feed
2011-10-30 15:34 8421. we need to get all the micro ... -
12.2 a working follow button with Ajax
2011-10-29 18:10 8951. in the last chapter, in the ... -
12.2 a web interface for following and followers.
2011-10-28 22:14 8571.before we do the UI, we need ... -
12. following user, 12.1 relationship model
2011-10-18 14:29 7281. we need to use a relationshi ... -
11.3 manipulating microposts.
2011-10-17 15:31 8821. since all micropost actions ... -
11.2 show microposts.
2011-10-17 12:01 6831. add test to test the new use ... -
11.1 user micropost -- a micropost model.
2011-10-17 10:43 10871. we will first generate a mic ... -
10.4 destroying users.
2011-10-16 15:47 715in this chapter, we will add de ... -
10.3 showing users list
2011-10-15 20:41 757in this chapter, we will do use ... -
10.2 protect pages.
2011-10-15 15:11 634again, we will start from TD ... -
10.1 updating users.
2011-10-14 18:30 6921. git checkout -b updating-use ... -
9.4 sign out
2011-10-13 15:21 718whew!!!, last chapter is a long ... -
9.3 sign in success.
2011-10-12 15:39 7211. we will first finish the cre ... -
9.2 sign in failure
2011-10-12 12:19 642start from TDD!!! 1. requir ... -
9.1 sessions
2011-10-12 10:00 636a session is a semi-permanent c ... -
what test framework should you use?
2011-10-11 16:56 0for integration test, i have no ... -
what test framework should you use?
2011-10-11 16:56 0<p>for integration test, ... -
8.4 rspec integration tests
2011-10-11 16:53 699in integration test, you can te ... -
8.3 sign up success
2011-10-11 14:39 764Chapter 8.3 this part, we will ...
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