Flutter:按日期读取和合并firestore数据

import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';

class FirestoreDataPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Firestore Data'),
      ),
      body: StreamBuilder<QuerySnapshot>(
        stream: FirebaseFirestore.instance.collection('your_collection').snapshots(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            return CircularProgressIndicator();
          }
          List<DocumentSnapshot> documents = snapshot.data.docs;
          List<DocumentSnapshot> filteredDocuments = [];
          String targetDate = '2022-01-01'; // 目标日期
          
          // 按日期筛选数据
          for (var document in documents) {
            if (document.data()['date'] == targetDate) {
              filteredDocuments.add(document);
            }
          }
          
          // 合并数据
          List<Map<String, dynamic>> mergedData = [];
          for (var document in filteredDocuments) {
            mergedData.addAll(document.data()['data']);
          }
          
          return ListView.builder(
            itemCount: mergedData.length,
            itemBuilder: (context, index) {
              return ListTile(
                title: Text(mergedData[index]['title']),
                subtitle: Text(mergedData[index]['content']),
              );
            },
          );
        },
      ),
    );
  }
}