Step 6.15: Implement Meteor method for adding a new message

api/server/methods.ts

@@ -0,0 +1,23 @@
+import { Chats } from './collections/chats';
+import { Messages } from './collections/messages';
+import { MessageType } from './models';
+
+Meteor.methods({
+  addMessage(type: MessageType, chatId: string, content: string) {
+    const chatExists = !!Chats.collection.find(chatId).count();
+
+    if (!chatExists) {
+      throw new Meteor.Error('chat-not-exists',
+        'Chat doesn\'t exist');
+    }
+
+    return {
+      messageId: Messages.collection.insert({
+        chatId: chatId,
+        content: content,
+        createdAt: new Date(),
+        type: type
+      })
+    };
+  }
+});