23 Feb '12, 6am

Ruby on Rails Guides: Active Record Query Interface:

because of argument safety. Putting the variable directly into the conditions string will pass the variable to the database as-is . This means that it will be an unescaped variable directly from a user who may have malicious intent. If you do this, you put your entire database at risk because once a user finds out he or she can exploit your database they can do just about anything to it. Never ever put your arguments directly inside the conditions string.

Full article: http://edgeguides.rubyonrails.org/active_record_querying....

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