libr-2/app/models/user.rb

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  before_create :set_name, :generate_auth_key

  has_many :comments
  has_many :likes
  has_many :favorites
  has_many :share_instances
  has_many :auth_tokens

  has_many :follow_relations

  has_many :stars, through: :follow_relations, source: :star, primary_key: :user_id ,foreign_key: :user_id

  def followers
    user_ids = FollowRelation.where(star_id: self.id).pluck(:user_id)
    User.where(id: user_ids)
  end

  private

  def set_name
    email_name = email.split('@')[0]
    self.name = email_name
  end

  def ensure_authentication_token
    if auth_keys.empty?
      generate_auth_key
    end
  end

  def generate_auth_key
    AuthToken.generate_token_for self
  end

  def active_auth_token
    if auth_tokens.empty?
      generate_auth_key
    end
    auth_tokens.first.value
  end

end