Ruby .. Effective way to implement if else condition : I have three database boolean columns "google", "yahoo", "bing". I need to print them on html.erb page like this. 

"google + yahoo" if only google and yahoo is true.
"google + yahoo + bing" if all three are true.
"google" if only   google is true.

I am using ruby on rails. Is there any effective way to implement this. If I do it in a traditional way then "if .. else" conditions will be large.
 

Thanks in advance!