Step 6.3: Define 'addChat' Method

server/imports/methods/methods.ts

@@ -23,6 +23,28 @@ Meteor.methods({
       $set: {profile}
     });
   },
+  addChat(receiverId: string): void {
+    if (!this.userId) throw new Meteor.Error('unauthorized',
+      'User must be logged-in to create a new chat');
+
+    check(receiverId, nonEmptyString);
+
+    if (receiverId == this.userId) throw new Meteor.Error('illegal-receiver',
+      'Receiver must be different than the current logged in user');
+
+    const chatExists = !!Chats.collection.find({
+      memberIds: {$all: [this.userId, receiverId]}
+    }).count();
+
+    if (chatExists) throw new Meteor.Error('chat-exists',
+      'Chat already exists');
+
+    const chat = {
+      memberIds: [this.userId, receiverId]
+    };
+
+    Chats.insert(chat);
+  },
   addMessage(chatId: string, content: string): void {
     if (!this.userId) throw new Meteor.Error('unauthorized',
       'User must be logged-in to create a new chat');