Step 7.13: Add publication for Chats

server/imports/publications/chats.publication.ts

@@ -0,0 +1,38 @@
+import { Meteor } from 'meteor/meteor';
+
+import { Chats } from '../../../both/collections/chats.collection';
+import { Chat } from '../../../both/models/chat.model';
+import { Messages } from '../../../both/collections/messages.collection';
+import { Message } from '../../../both/models/message.model';
+import { Users } from '../../../both/collections/users.collection';
+import { User } from '../../../both/models/user.model';
+
+Meteor.publishComposite('chats', function(): PublishCompositeConfig<Chat> {
+  if (!this.userId) return;
+
+  return {
+    find: () => {
+      return Chats.collection.find({memberIds: this.userId});
+    },
+
+    children: [
+      <PublishCompositeConfig1<Chat, Message>> {
+        find: (chat) => {
+          return Messages.collection.find({chatId: chat._id}, {
+            sort: {createdAt: -1},
+            limit: 1
+          });
+        }
+      },
+      <PublishCompositeConfig1<Chat, User>> {
+        find: (chat) => {
+          return Users.collection.find({
+            _id: {$in: chat.memberIds}
+          }, {
+            fields: {profile: 1}
+          });
+        }
+      }
+    ]
+  };
+});