[Rails] How to use url_escape in controller?

[softwareengineer 99]

I know one can use <%=u "a string" %> to use the url_escape function in ROR and convert "a string" to "a%20string"
  
  I tried using url_escape and u in my controller but none of them work and I get a function unknown error.
  
  Can anyone please guide me as to how I can use the url escape function in my controller?
  
  I appreciate your help
  
  Thanks
  Frank
  
  
		
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