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体验新版 GitCode,发现更多精彩内容 >>
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编写于
4月 20, 2012
作者:
O
Oscar Del Ben
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Add "Saving data in the controller" section
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@@ -463,6 +463,33 @@ command will apply to the database defined in the +development+ section of your
environment, for instance in production, you must explicitly pass it when
invoking the command:
<tt>
rake db:migrate RAILS_ENV=production
</tt>
.
h4. Saving data in the controller
Back into +posts_controller+, we need to change the +create+ action
to use the new +Post+ model to save data in the database. Open that file
and change the +create+ action to look like the following:
<ruby>
def create
@post = Post.new(params[:post])
@post.save
redirect_to :action => :index
end
</ruby>
Here's what's going on: every Rails model can be initialized with its
respective attributes, which are automatically mapped to its
database columns. In the first line we do just that (remember that
+params[:post]+ contains the attributes we're interested in). Then,
+@post.save+ is responsible for saving the model in the database.
Finally, on the last line we redirect the user to the +index+ action,
wich we have not defined yet.
TIP: As we'll see later, +@post.save+ returns a boolean indicating
wherever the model was saved or not, and you can (and usually do) take
different actions depending on the result of calling +@post.save+.
h4. Adding a Link
To hook the posts up to the home page you've already created, you can add a link
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