creates Manager

app/models/manager.rb

@@ -0,0 +1,12 @@
+class Manager < ActiveRecord::Base
+  validates :username, presence: true, uniqueness: true
+  validates :password_digest, presence: true
+
+  has_secure_password
+
+  def self.valid_auth?(username = nil, password = nil)
+    return false unless username.present? && password.present?
+    Manager.find_by(username: username).try(:authenticate, password).present?
+  end
+
+end