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Now these variables cannot be mass-assigned with a parameters hash like the one in the preceding example. However, you can still set them individually when needed: @user.accepted = true Another vulnerability raises its ugly head when you let users edit their information; for example, with URLs like http://www.domain.com/posts/edit/28. It won t take long before someone notices that by changing the last part of the URL, she can get access to posts created by other people. You can protect your application from this by always getting to the objects through the logged-in user: # BAD @post = Post.find(params[:id]) # GOOD @post = current_user.posts.find(params[:id]) If someone now tries to access a post that doesn t belong to her, an ActiveRecord::RecordNotFound exception is raised, which you can then rescue and show a Not Found page to the user: rescue ActiveRecord::RecordNotFound return render(:template => "/shared/404", :status => 404) end

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Figure 1-6. Percent change per year in the food sales data The vice president of sales is happy with the report you created and asks you to create a visual summary to use in the Chicago meeting. The chart should show the totals per year for each product category in the Chicago area. You make a couple of quick changes to the pivot table, press a key on the keyboard, add a title, and your pivot chart is ready (see Figure 1-7). The vice president of sales leaves for the airport, ready for the Chicago meeting, and you are relieved that you completed all those last-minute jobs without having to stay late!

Figure 3-41. Opening the generated SQL script file in SQL Server Management Studio When the Open File dialog box appears, browse to the C:\LunchCounter folder and select the SandwichLanguage.sql. To open it, either double-click the file or click the Open button. This will display the contents of the T-SQL script file. Click the Execute button on the SSMS toolbar, as shown in Figure 3-42.

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One of the most common security holes in web applications is that they pass user input directly to the database without quoting. Thus, a malicious user can fairly easily run all the SQL he wants to on the server. An example of this would be a search form submission that is handled by the following code: @users = User.find(:conditions => "name = '#{params[:q]'") Now let s say Dirty Harry puts the following string into the search form: "monkey'; delete from users; --" The resulting SQL query will be as follows: SELECT * from users where name = 'monkey'; delete from users; --' This is a perfectly valid SQL query and will effectively wipe out the whole users table. Thus, you should never, ever, pass anything unquoted to the :conditions parameter of ActiveRecord finders. Instead, use the bind variable syntax: @users = User.find(:conditions => ["name = ", params[:q]]) You can pass in as many question mark/variable pairs you need. They will be parsed and quoted in the order they are specified. Another option in simple cases is to use the magic finders, where the parameter value is automatically quoted, too: @users = User.find_by_name(params[:q])

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