ios - Retrieving Custom Parse User Variables -

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i creating app uses parse. have set user sign , login. have username , password options figured out, want third option. going string called "school" 

  user["school"] = "your school here"

and created. having trouble accessing current user in class.

i need have string, can have pfquery similar 

query.wherekey("pfobject.school", equalto: currentuser["school"])

but not sure syntax choose. if other information needed, let me know. thanks.

cast object string below:

query.wherekey("school", equalto: currentuser!["school"] as! string)

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