sequelize-associations

Friend requests, group subscriptions, invitations using Sequelize associations

Docs

Sequelize documentation on associations

Getters and Setters found here

BelongsTo, BelongsToMany found here

Demo

Demo site to view friend requests, group subscriptions, team members join, etc.

Also check out the production site.

(Demo GIF) Accepting Friends Requests

Sequelize Associations

Basic Business Goal

• Users can send friend requests to other users.
• Users can create teams to which they can invite friends as members.
• A user can view a list of: friends, teams(subscriptions), and each team's members.
• Only friends can access to friends' profiles, and only members can access to their teams.

Design

• User-to-Team relationship: A user can create many teams(subscriptions), each containing many users(members).
• User-to-User relationship: A user(requester) can send a friend request to another user(requestee). If the requestee confirms, they will be friends.

Models

• User
• Team
• (Will skip other models for now)

//USER
classMethods: {
  associate(models) {
    User.belongsToMany(models.Team, { as: 'Subscriptions', through: 'user_teams', foreignKey: User.id });
    User.belongsToMany(User, { as: 'Friends', through: 'friends' });
    User.belongsToMany(User, { as: 'Requestees', through: 'friendRequests', foreignKey: 'requesterId', onDelete: 'CASCADE'});
    User.belongsToMany(User, { as: 'Requesters', through: 'friendRequests', foreignKey: 'requesteeId', onDelete: 'CASCADE'});
  }
}

//TEAM
Team.belongsToMany(models.User, { as: 'Members', through: 'user_teams', foreignKey: Team.id });

Routes

//USER
export default function(app, express, router) {
  router.param('id', usersController.setUserById);
  router.get('/user/:id', usersController.getUserById);
  ...
  router.put('/user/:id/subscription', usersController.putSubscription);
  router.get('/user/:id/subscription', usersController.getSubscription);
  ...
  router.put('/user/:id/friendRequest', usersController.putFriendRequest);
  router.get('/user/:id/friendRequestReceived', usersController.getFriendRequestReceived);
  router.get('/user/:id/friendRequestSent', usersController.getFriendRequestSent);
  ...
  router.put('/user/:id/acceptFriendRequest', usersController.acceptFriendRequest);
  router.get('/user/:id/friends', usersController.getFriends);
  router.put('/user/:id/cancelFriendRequest', usersController.cancelFriendRequest);
  router.put('/user/:id/unfriend', usersController.unfriend);
}

//TEAM
export default function(app, express, router) {
  router.param('teamId', teamsController.setTeamById);
  router.get('/team/:teamId', teamsController.getTeamById);
  router.put('/team/:teamId/members', teamsController.putMembers);
  router.get('/team/:teamId/members', teamsController.getMembers);
  router.get('/team/:teamId/member', teamsController.getMemberById);
  ...
}

Controllers

//USER
setUserById(req, res, next, id) {
  console.log('Set router.param for :userId');
  db.User.findById(id)
    .then(user => {
      if (!user) res.sendStatus(404);
      else {
        req.user = user;
        next();
      }
    })
    .catch(next);
},

getUserById(req, res) {
  console.log("Get user by id");
  res.send(req.user);
},

putSubscription(req, res, next) {
  console.log('Subscribe user to the team');
  req.user.addSubscriptions(req.body.teamId)
    .then(result => res.status(201).send(result))
    .catch(next);
},

getSubscription(req, res, next) {
  console.log('Get all teams the user is subscribed to');
  req.user.getSubscriptions()
    .then(result => res.status(201).send(result))
    .catch(next);
},

putFriendRequest(req, res, next) {
  if (req.body.requesteeId != req.user.id) {
    console.log('Send friend request');
    req.user.addRequestees(req.body.requesteeId)
      .then(result => res.status(201).send(result))
      .catch(next);
  } else {
    res.status(400).send('Cannot friend yourself');
  }
},
...

//TEAM
setTeamById(req, res, next, id) {
  console.log('Set router.param for :teamId');
  db.Team.findById(id)
    .then(team => {
      if (!team) res.sendStatus(404);
      else {
        req.team = team;
        next();
      }
    })
    .catch(next);
},

getTeamById(req, res) {
  console.log("Get team by id");
  res.send(req.team);
},

putMembers(req, res, next) {
  console.log('Add members to team');
  req.team.addMembers(req.body.friendIds)
    .then(result => res.status(201).send(result))
    .catch(next);
},

getMembers(req, res, next) {
  console.log('Get team members');
  req.team.getMembers()
    .then(users => {
      var updated = users.map((user) => {
        return {
          id: user.id,
          username: user.username,
          name: `${user.first_name} ${user.last_name}`
        }
      });
      res.status(201).send(updated);
    })
    .catch(next);
},
...