meteor__coursera-meteor-2/client/routes.js

Meteor.subscribe("users");

// set up the main template the the router will use to build pages
Router.configure({
  layoutTemplate: "ApplicationLayout"
});

// specify the top level route, the page users see when they arrive at the site
Router.route("/", function () {
  console.log("rendering root /");
  this.render("navbar", { to: "header" });
  this.render("lobby_page", { to: "main" });
});

// specify a route that allows the current user to chat to another users
Router.route("/chat/:_id", {
  subscriptions: function () {
    Meteor._debug('subscriptions', arguments);
    return Meteor.subscribe("chats");
  },

  action: function () {
    Meteor._debug('action', arguments);
    if (this.ready()) {
      Meteor._debug("Ready");
      // the user they want to chat to has id equal to
      // the id sent in after /chat/...
      const otherUserId = this.params._id;
      // find a chat that has two users that match current user id
      // and the requested user id
      const filter = {
        $or: [
          {
            user1Id: Meteor.userId(),
            user2Id: otherUserId
          },
          {
            user2Id: Meteor.userId(),
            user1Id: otherUserId
          }
        ]
      };
      const chat = Chats.findOne(filter);
      Meteor._debug(filter, chat);
      // No chat matching the filter - need to insert a new one.
      let chatId;
      if (!chat) {
        chatId = Chats.insert({
          user1Id: Meteor.userId(),
          user2Id: otherUserId
        });
        Meteor._debug("No chat found between " + Meteor.userId() + " and " + otherUserId + ". Created " + chatId);
      }
      // There is a chat going already - use that.
      else {
        chatId = chat._id;
        Meteor._debug("Chat " + chatId + " found between " + Meteor.userId() + " and " + otherUserId + ".");
      }
      // Looking good, save the id to the session.
      if (chatId) {
        Session.set("chatId", chatId);
      }
      this.render("navbar", { to: "header" });
      this.render("chat_page", { to: "main" });
    }
    else {
      Meteor._debug('not ready');
      this.render("Loading");
    }
  }
});