我的代码返回一个可选的

Question

从核心数据中获取所有这些数据，并且返回nil，这是我的代码

 var user_id:String!
    var customer_name:String!
    var customer_phone:String!
    var resturant_id:String!
    var card_id:String!
    var customer_coordinate:String!
    var customer_address:String!
    var address_id:String!
    var card_idd:String!

    let param: [String : AnyObject] = ["customer_id":user_id!, "customer_name":customer_name!,"customer_phone":customer_phone!,"total": 3223, "delivery_fee": 200, "restaurant_id": 5, "card_id": card_idd!,"customer_address_id": 20,"customer_street_address": customer_address!, "customer_address_coordinates": customer_coordinate!,"OrderDetails": vrt]

    print(param)

但是param正在返回一个可选的

这里是如何从核心数据中获取数据

func fetchUserCheck(customer_coordinate:String,customer_name:String,customer_address:String,customer_phone:String){
    let app = UIApplication.sharedApplication().delegate as! AppDelegate
    let context = app.managedObjectContext
    var users = [User]()
    var fetchRequest = NSFetchRequest(entityName: "User")
    do{
        users = try context.executeFetchRequest(fetchRequest) as! [User]

        for user in users{
            user.longLat = customer_coordinate
            user.address = customer_address
            user.name = customer_name
            user.phone = customer_phone                
        }            
    }catch{
        print("")
    }        
}