Fix missing validations on Signup (#4674)

* Fix missing validations on Signup

This commit fixes issue
https://github.com/plataformatec/devise/issues/4673

This removes `validate: false` from saving a record when `Trackable` is
in use.

* Add test case

* Add mongoid model

test/rails_app/app/active_record/user.rb

@@ -4,4 +4,6 @@ class User < ActiveRecord::Base
   include Shim
   include SharedUser
   include ActiveModel::Serializers::Xml if Devise::Test.rails5?
+
+  validates :sign_in_count, presence: true
 end

test/rails_app/app/active_record/user_with_validations.rb

@@ -0,0 +1,10 @@
+require 'shared_user'
+
+class UserWithValidations < ActiveRecord::Base
+  self.table_name = 'users'
+  include Shim
+  include SharedUser
+
+  validates :email, presence: true
+end
+

test/rails_app/app/mongoid/user_with_validations.rb

@@ -0,0 +1,35 @@
+require "shared_user"
+
+class UserWithValidations
+  include Mongoid::Document
+  include Shim
+  include SharedUser
+
+  field :username, type: String
+  field :facebook_token, type: String
+
+  ## Database authenticatable
+  field :email, type: String, default: ""
+  field :encrypted_password, type: String, default: ""
+
+  ## Recoverable
+  field :reset_password_token, type: String
+  field :reset_password_sent_at, type: Time
+
+  ## Rememberable
+  field :remember_created_at, type: Time
+
+  ## Trackable
+  field :sign_in_count, type: Integer, default: 0
+  field :current_sign_in_at, type: Time
+  field :last_sign_in_at, type: Time
+  field :current_sign_in_ip, type: String
+  field :last_sign_in_ip, type: String
+
+  ## Lockable
+  field :failed_attempts, type: Integer, default: 0 # Only if lock strategy is :failed_attempts
+  field :unlock_token, type: String # Only if unlock strategy is :email or :both
+  field :locked_at, type: Time
+
+  validates :email, presence: true
+end