Firestore read document - swift

Question

I am trying to read a document from Firestore but I face this problem
Error Domain=FIRFirestoreErrorDomain Code=14 "Failed to get document because the client is offline." UserInfo={NSLocalizedDescription=Failed to get document because the client is offline.}
Note : the collection and the document are existing
I am use Firebase/Firestore version 1.17.1
could anyone help me please?!

Answer 1

This is an example of getting data with Cloud Firestore (source: firebase.google.com)
Firstly create data:
let citiesRef = db.collection("cities")
citiesRef.document("SF").setData([
"name": "San Francisco",
"state": "CA",
"country": "USA",
"capital": false,
"population": 860000,
"regions": ["west_coast", "norcal"]
])
citiesRef.document("LA").setData([
"name": "Los Angeles",
"state": "CA",
"country": "USA",
"capital": false,
"population": 3900000,
"regions": ["west_coast", "socal"]
])
citiesRef.document("DC").setData([
"name": "Washington D.C.",
"country": "USA",
"capital": true,
"population": 680000,
"regions": ["east_coast"]
])
citiesRef.document("TOK").setData([
"name": "Tokyo",
"country": "Japan",
"capital": true,
"population": 9000000,
"regions": ["kanto", "honshu"]
])
citiesRef.document("BJ").setData([
"name": "Beijing",
"country": "China",
"capital": true,
"population": 21500000,
"regions": ["jingjinji", "hebei"]
])
Then the following example shows how to retrieve the contents of a single document using get():
let docRef = db.collection("cities").document("SF")
docRef.getDocument { (document, error) in
if let document = document, document.exists {
let dataDescription = document.data().map(String.init(describing:)) ?? "nil"
print("Document data: \(dataDescription)")
} else {
print("Document does not exist")
}
}
This may be as well be an error if you are using firebase.firestore(), with firebase.database() it is working well. 😘