add structure

lib/model/announcement_model.dart

@@ -0,0 +1,61 @@
+import 'dart:async';
+
+import 'package:cloud_firestore/cloud_firestore.dart';
+import 'package:fcs/vo/announcement.dart';
+
+import 'base_model.dart';
+import 'constants.dart';
+import 'firebase_helper.dart';
+
+class AnnouncementModel extends BaseModel {
+  List<Announcement> announcements = [];
+
+  void initUser(user) {
+    super.initUser(user);
+    _loadAnnouncements();
+  }
+
+  @override
+  logout() async {
+    announcements = [];
+  }
+
+  Future<void> _loadAnnouncements() async {
+    Stream<QuerySnapshot> snapshots = Firestore.instance
+        .collection(
+            "/$biz_collection/${setting.okEnergyId}/$announcement_collection")
+        .snapshots();
+
+    snapshots.listen((snaps) async {
+      announcements = snaps.documents.map((documentSnapshot) {
+        var data = Announcement.fromMap(
+            documentSnapshot.data, documentSnapshot.documentID);
+        return data;
+      }).toList();
+
+      notifyListeners();
+    });
+  }
+
+
+  Future<Announcement> getAnnouncement(String id) async {
+    String path = "/$biz_collection/${setting.okEnergyId}/$announcement_collection";
+    var snap = await getDocSnap(path, id);
+    return Announcement.fromMap(snap.data, snap.documentID);
+  }
+
+  Future<void> createAnnouncement(Announcement announcement) async {
+    await request("/announcement", "POST",
+        payload: announcement.toMap(), token: await getToken());
+  }
+
+  Future<void> updateAnnouncement(Announcement announcement) async {
+    await request("/announcement", "PUT",
+        payload: announcement.toMap(), token: await getToken());
+  }
+
+  Future<void> deleteAnnouncement(Announcement announcement) async {
+    await request("/announcement", "DELETE",
+        payload: announcement.toMap(), token: await getToken());
+  }
+}