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在此处输入图像描述 在此处输入图像描述这是我的 Xcode 项目。我已经将它连接到firebase，但我不断收到错误：

2017-11-28 12:37:38.478475-0500 RatFinder_ios[1099:21397] ***
Terminating app due to uncaught exception 'NSUnknownKeyException', reason:
'[<FIRDatabaseReference 0x600000853170> setValue:forUndefinedKey:]: 
this class is not key value coding-compliant for the key City.'

我很困惑，因为我遵循了所有符合编码的规则，并确保传递给函数的信息是：

func writeToFirebase()
{
    let refRats = Database.database().reference()
    let key = refRats.childByAutoId().key
    guard let dateText = dateTextField.text, let boroughText = boroughTextField.text, let locationTypeText = locationTypeTextField.text, let addressText = addressTextField.text, let cityText = cityTextField.text, let zipText = zipTextField.text, let latitudeText = latitudeTextField.text, let longitudeText = longitudeTextField.text, let createdDateIntText = createdDateInt() else { return }
    //creating rat with the given values
    let rat: [String: Any] = Sighting.init(createdDate: dateText, createdDateInt: createdDateIntText, incidentAddress: addressText, locationType: locationTypeText, incidentZip: zipText, city: cityText, borough: boroughText, latitude: latitudeText, longitude: longitudeText).toDictionary()

    refRats.child(key).setValuesForKeys(rat)
}
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