Does Rails automatically protect against vulnerabilities of doing something like: Given a URL: http://a.com/?id=3131313131313

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Editorial Team

Asked: May 20, 20262026-05-20T07:31:15+00:00 2026-05-20T07:31:15+00:00

Does Rails automatically protect against vulnerabilities of doing something like:

then in the rails controller

@comment = Comment.find(params[:id])

Does Rails auto protect that, or do I need to do some type of validation to protect the app from hackers?

Thanks

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Editorial Team · Answer 1 · 2026-05-20T07:31:16+00:00

Editorial Team

ActiveRecord find will always use .to_i to prevent all SQL injection magic.

Rails will also auto-escape stuff in queries like this:

Comment.where(["id = ?", params[:id]])

But not in

Comment.where("id = #{params[:id]}")

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