meteor__coursera-meteor-2/client/chat_page.js

Template.chat_page.helpers({
  messages: function () {
    const chat = Chats.findOne({ _id: Session.get("chatId") });
    console.log("messages context", this, chat.messages);
    return chat.messages;
  }
});

Template.chat_page.events({
  // this event fires when the user sends a message on the chat page
  "submit .js-send-chat": function (event) {
    // stop the form from triggering a page reload
    event.preventDefault();
    // see if we can find a chat object in the database
    // to which we'll add the message
    const chat = Chats.findOne({ _id: Session.get("chatId") });
    if (chat) {
      // OK - we have a chat to use.
      Meteor.call("chats.pushMessage", chat, event.target.chat.value);
      // reset the form
      event.target.chat.value = "";
    }
  }
});