Methods added to our CurrentFollowedUsers service to follow/unfollow a user

gistfile1.coffee

angular.module("PathgatherApp").factory 'CurrentFollowedUsers', (["CurrentUser", "$q", (CurrentUser, $q) ->
  followed_users = null
  followed_users_promise = null
  {
    getFollowedUsers: () ->
      return CurrentUser.getUser().then (current_user) ->
        if followed_users?
          deferred = $q.defer()
          deferred.resolve(followed_users)
          return deferred.promise
        else if followed_users_promise?
          return followed_users_promise
        else
          # This is the first request for this data
          followed_users_promise = current_user.getList('following')
          followed_users_promise.then (response) ->
            followed_users = response
          return followed_users_promise
 
    followingUser: (user) ->
      return this.getFollowedUsers().then ->
        _.findWhere(followed_users, {id: user.id}) 
  
    follow: (user) ->
      CurrentUser.getUser().then (current_user) ->
        promise = current_user.customPOST('follow', {user_id: user.id}).then (response) ->
          followed_users.push(response)
          return response
        return promise
    
    unfollow: (user) ->
      CurrentUser.getUser().then (current_user) ->
        promise = current_user.customPOST('unfollow', {user_id: user.id}).then (response) ->
          followed_users = _.reject followed_users, (u) -> 
            u.id == id
          return response
        return promise
  }
])