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("Routing 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");
    return Meteor.subscribe("chats");
  },

  action: function (req, wtf, func) {
    Meteor._debug("Action", req.url);
    if (this.ready()) {
      console.log("- Now 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
        });
        console.log("--- No chat found between " + Meteor.userId() + " and " + otherUserId + ". Created " + chatId);
      }
      // There is a chat going already - use that.
      else {
        chatId = chat._id;
        console.log("--- 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",
        data: function () {
          const other = Meteor.users.findOne({ _id: otherUserId });
          console.log("--- Routing data, other: " + (other ? other.profile.username : "not available"));
          return {
            other: other
          };
        }
      });
    }
    else {
      console.log("- Not yet ready");
      this.render("Loading");
    }
  }
});