React Native FirebaseError:函数Query.startAfter()需要有效的第一个参数，但未

Question

所以我收到错误或：

FirebaseError:Function Query.startAfter((需要一个有效的第一个论点，但没有定义。

我的代码：

getMore = async () => {
let check = {};
check = this.state.lastDoc;
console.log(check); //returns a big object I will post below.
if (check) {
this.setState({ isMoreLoading: true });
setTimeout(async () => {
let snapshot = await firebase
.firestore()
.collection("posts")
.orderBy("timestamp", "desc")
.startAfter(check.data().id)
.limit(2)
.get();
};

所以我想这个错误是关于firebase的。

控制台日志(检查(在使用前返回的内容startAfter：它被剪掉了一点，因为它不能被张贴：它被切掉了一点因为无法发布：

QueryDocumentSnapshot {
"_document": Document {
"converter": [Function anonymous],
"
},
"name": Object {
"stringValue": "NoviMatko",
},
"text": Object {
"stringValue": "For wh perceive laughing six did far.",
},
"timestamp": Object {
"integerValue": "1604771339487",
},
"uid": Object {
"stringValue": "S2BxNARp4Cfinttb1TK5mzAHPb13",
},
},
"name": "projects/eleph-6fee9/databases/(default)/documents/posts/djoSXIPRn1RMxMq2TD4C",
"updateTime": "2020-11-07T17:49:00.119930Z",
},
"version": SnapshotVersion {
"timestamp": Timestamp {
"nanoseconds": 119930000,
"seconds": 1604771340,
},
},
},

"

"[DEFAULT]" => Object {
"apiKey": "AIzaSyDwUBce3WYEl78xA6aag5nzb1xh2xC8dZQ",

"lastLoginAt": "1604691856267",
"phoneNumber": null,
"photoURL": null,
"providerData": Array [
Object {
"displayName": null,
"email": "[e-mail]",
"phoneNumber": null,
"photoURL": null,
"providerId": "password",
"uid": "[e-mail]",
},
],
"redirectEventId": null,

},
"tenantId": null,
"uid": "S2BxNARp4Cfinttb1TK5mzAHPb13",
},
},
},
"instancesDeferred": Map {},
"name": "auth",
},

},
"container": [Ci...(truncated to the first 10000 characters)
Got all results
vVbq2mwrDMseBxCPDj15 => {"avatar":null,"name":"NoviMatko","text":"evoooo","timestamp":1605303464278,"uid":"S2BxNARp4Cfinttb1TK5mzAHPb13"}
vG9p4xL8UqlZBkls1Xv1 => {"avatar":null,"name":"NoviMatko","text":"gdgdgdg","timestamp":1605303411975,"uid":"S2BxNARp4Cfinttb1TK5mzAHPb13"}
xyyZQs5q9OLP2BdqDwJO => {"avatar":null,"name":"NoviMatko","text":"jkj","timestamp":1605136211563,"uid":"S2BxNARp4Cfinttb1TK5mzAHPb13"}
jttcmEM8WFHOXxRIO9q9 => {"avatar":null,"name":"NoviMatko","text":"adawdadjnajodhjadjonadjjajdhajdnjadnjandjnadnadajdnjas","timestamp":1605116149227,"uid":"S2BxNARp4Cfinttb1TK5mzAHPb13"}
qFJwWiS0dpaKFbVOWrG1 => {"avatar":null,"name":"NoviMatko","text":"gsgsefgsfsf😘😘😊😊","timestamp":1605115920543,"uid":"S2BxNARp4Cfinttb1TK5mzAHPb13"}
qD8rrsexA4HrWHvCtfxR => {"avatar":null,"name":"NoviMatko","text":"JLKDBWJENKEFJOFBNKOJSBENFJKSNFJKLSNFJKSJNFJSKFNJSNFNSFNSNFNSJKLEFNSENFSNFJNSEJFNSJFNSJFNSEFNLSNF;SNFS;FH;SFJSFNSJFNSJNFJSNFJSNFNSNFNSFNSJFNSFNSF","timestamp":1605115869284,"uid":"S2BxNARp4Cfinttb1TK5mzAHPb13"}
djoSXIPRn1RMxMq2TD4C => {"avatar":null,"name":"NoviMatko","text":"For who thoroughly her boy estimating conviction. Reme admire in giving. See resolved goodness felicity shy civility domestic had 
but. Drawings offended yet answered jennings perceive laughing six did far.","timestamp":1604771339487,"uid":"S2BxNARp4Cfinttb1TK5mzAHPb13"}
eILcb0rPOZ0Rpeoym6uX => {"avatar":"https://firebadia&token=272cfbff-3fd7-4216-a6c3-09ed612eca3e","text":"Fjjfjffj","timestamp":1604395119914,"uid":"oTPw7q2jRWcE3F92U4aXeHHTHDg1"}
y7FN13SKWUDsWdKsGJiT => {"commentCount":3,"likeCount":5,"mood":"Yy","text":"Today is such 
a joyful day because its Monday and at Mondays we dont do much at my work #blessed","timestamp":1592776918943,"userHandle":" NRQ2Ewhx76cWVqntRPLV1ygYHB73"}

Answer 1

错误消息告诉您check.data().id未定义，而不是check。如果您想查看check.data().id的值，您应该记录该值。

这里可能发生的情况是，你手头的文件没有一个名为"；id"；。这可以解释为什么您会看到此错误消息。

如果您想正确使用startAfter()，实际上应该只将整个DocumentSnapshot对象传递给它：

let snapshot = await firebase
.firestore()
.collection("posts")
.orderBy("timestamp", "desc")
.startAfter(check)
.limit(2)
.get();

有关更多信息，请参阅有关分页API的文档。