Read e-book online Objects on Rails PDF

By Avdi Grimm

This booklet is aimed toward the operating Rails developer who's trying to develop and evolve Rails initiatives whereas maintaining them versatile, maintainable, and powerful. the focal point is on pragmatic recommendations which tread a "middle way" among the expedience of the Rails "golden path", and inflexible OO purity.

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57 Oh by the way, that post_source? It’s a factory, as in “the Factory pattern”. I didn’t want to scare you off with big pattern talk, so I snuck it in under an assumed name ;-) 57 Sorting and limiting posts OK, now we have timestamps on the posts. On a proper blog, posts are listed in reverse-chronological order, with the most recent post at the top. Let’s implement sorting by timestamp, and while we’re at it, let’s limit the display to the ten most recent posts. rb # ... wont_include(oldest) end end # ...

Each do |k,v| send("#{k}=",v) end end # ... end Listing 20: Implementing keyword arguments Now we just need to update the views to show our posts. body %>

Listing 22: The Blog entry partial Reloading the page, we can see our demo entries. 36 ADDING BLOG ENTRIES 37 Figure 2: Showing entries 37 Submitting posts This is progress, but a blog with static entries doesn’t do us a lot of good. We need to be able to submit new entries. First we’ll add a “New post” link. -- ... -- ... rb # ...

The upgrade goes easily, and everything is working great. Then one day a clever user realizes that if he can guess the ID of someone else’spost, he can modify its content! Why is this possible? find() bypassed any scope constraints imposed by accessing posts from a Blog instance instead of fetching them directly. These are not hypothetical issues; I’ve seen them in production codebases. Using different terms for “the blog’s entries” and “a Post object” doesn’t automatically fix the problem. But if they mentally trip us up a bit, that might just be the nudge we need to remember that the entries managed by a blog are not necessarily equivalent to the set of all Post records.

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Objects on Rails by Avdi Grimm


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