ruby - prevent sql injection in rails -


i using following query find nearest locations google maps. immune sql injection. if not can me rid of it.

alphacourses.find_by_sql("select *,(  6371 * acos( cos( radians( #{@latitude} ) ) * cos( radians( latitude ) ) * cos( radians( longitude ) - radians( #{@longitude} ) ) + sin( radians( #{@latitude} ) ) * sin( radians( latitude ) ) ) ) distance alpha_courses having distance <= #{@radius} order distance limit 200")

thanks in advance.

from: http://guides.rubyonrails.org/active_record_querying.html#pure-string-conditions

this code 

....("orders_count = ?", params[:orders])

is highly preferable code:

....("orders_count = #{params[:orders]}")

because of argument safety. putting variable directly conditions string pass variable database as-is. means unescaped variable directly user may have malicious intent. if this, put entire database @ risk because once user finds out or can exploit database can it. never ever put arguments directly inside conditions string.

apply example!


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