我正在尝试进行 Firestore 反应式分页。我知道有帖子、评论和文章说这是不可能的，但无论如何......

当我添加一条新消息时，它会启动或“删除”上一条消息

这是主要代码。我一次分页 4 条消息

async getpaginatedRTLData(queryParams: TQueryParams,onChange: Function){
  let collectionReference = collection(firestore,queryParams.pathToDataInCollection);
  let collectionReferenceQuery = this.modifyQueryByOperations(collectionReference,queryParams);

//Turn query into snapshot to track changes 
const unsubscribe = onsnapshot(collectionReferenceQuery,(snapshot: Querysnapshot) => {

  snapshot.docChanges().forEach((change: DocumentChange<DocumentData>) => {
    //Now save data to format later
    let formattedData = this.storeData(change,queryParams)
         
    onChange(formattedData);
  })
})

this.unsubscriptions.push(unsubscribe)
}

为了完整性，这就是我构建查询的方式

let queryParams: TQueryParams = {
  limitResultCount: 4,uniqueKey: '_id',pathToDataInCollection: messagePath,orderBy: {
    docField: orderByKey,direction: orderBy
  }
}    

  modifyQueryByOperations( 
collectionReference: CollectionReference<DocumentData> = this.collectionReference,queryParams: TQueryParams) {
//Extract query params
let { orderBy,where: where_param,limitResultCount = paginate} = queryParams;
let queryCall: Query<DocumentData> = collectionReference;

if(where_param) {
  let {searchByField,whereFilterOp,valueToMatch} = where_param;
  //collectionReferenceQuery = collectionReference.where(searchByField,valueToMatch)
  queryCall = query(queryCall,where(searchByField,valueToMatch) )
}

if(orderBy) {
  let { docField,direction} = orderBy;
  //collectionReferenceQuery = collectionReference.orderBy(docField,direction)
  queryCall = query(queryCall,fs_orderBy(docField,direction) )
}

if(limitResultCount) {
  //collectionReferenceQuery = collectionReference.limit(limitResultCount)
  queryCall = query(queryCall,limit(limitResultCount) );
}

if(this.lastDocInSortedOrder) {
  //collectionReferenceQuery = collectionReference.startAt(this.lastDocInSortedOrder)
  queryCall = query(queryCall,startAt(this.lastDocInSortedOrder) )
}

return queryCall
}

当我向集合中添加新消息时，看到最后一行已删除。更糟糕的是它并不一致。我对此进行了调试，Firestore 正在删除该消息。

我几乎觉得这是 Firestore 处理侦听器的错误