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Merge pull request #10872 from AJAlabs/master

Update Getting Started Guide - Strong Parameter [ci skip]
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2 parents 2b76313 + 15f3de2 commit 2d31df49d53d8d672e31e896ec221fb513a3257c @steveklabnik steveklabnik committed Jun 8, 2013
Showing with 11 additions and 4 deletions.
  1. +11 −4 guides/source/getting_started.md
@@ -531,21 +531,28 @@ and change the `create` action to look like this:
```ruby
def create
- @post = Post.new(params[:post])
-
+ @post = Post.new(post_params)
+
@post.save
- redirect_to @post
+ redirect_to @post
end
+
+private
+ def post_params
+ params.require(:post).permit(:title, :text)
+ end
```
Here's what's going on: every Rails model can be initialized with its
respective attributes, which are automatically mapped to the respective
database columns. In the first line we do just that (remember that
-`params[:post]` contains the attributes we're interested in). Then,
+`post_params` contains the attributes we're interested in). Then,
`@post.save` is responsible for saving the model in the database.
Finally, we redirect the user to the `show` action,
which we'll define later.
+TIP: Note that `def post_params` is private. This new approach prevents an attacker from setting the model’s attributes by manipulating the hash passed to the model. For more information, refer to [this blog post about Strong Parameters](http://weblog.rubyonrails.org/2012/3/21/strong-parameters/).
+
TIP: As we'll see later, `@post.save` returns a boolean indicating
whether the model was saved or not.

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