修改Devise以支持UUID主键

Question

我想修改Devise以使其与带有PostgreSQL的UUID主键的users表一起使用.

这是迁移:

class DeviseCreateUsers < ActiveRecord::Migration

  def change
    create_table :users, id: false do |t|
      t.uuid :uuid, null: false
      # ...
    end

    change_table :users do |t|
      t.index :uuid, unique: true
      # ...
    end
  end

  def migrate(direction)
    super
    if direction == :up
      # This is only necessary because the following does not work:
      # t.uuid :uuid, primary: true, null: false
      execute "ALTER TABLE users ADD PRIMARY KEY (uuid);"
    end
  end
end

这是User模型:

class User < ActiveRecord::Base

  primary_key = :uuid

  devise :database_authenticatable, :recoverable, :registerable,
    :rememberable, :trackable, :validatable

  validates :uuid, presence: true
  before_validation :ensure_uuid
  def ensure_uuid; self.uuid ||= SecureRandom.uuid end

end

这是错误:

PG::Error: ERROR:  operator does not exist: uuid = integer
LINE 1: ...ECT  "users".* FROM "users"  WHERE "users"."uuid" = 1  ORDER...
                                                             ^
HINT:  No operator matches the given name and argument type(s). You might need to add explicit type casts.
: SELECT  "users".* FROM "users"  WHERE "users"."uuid" = 1  ORDER BY "users"."uuid" ASC LIMIT 1

Extracted source (around line #5):

1    .navbar-inner
2      .container
3        = a_nav_tag "App", root_path
4        - if user_signed_in?
5          %ul.nav.pull-right
6            %li.dropdown#user_menu
7              %a.dropdown-toggle(data-toggle="dropdown" href="#")

正如你在上面看到的那样,它user_signed_in?被打破了.我希望从"正常"自动递增ID转换到UUID需要进行一些更改.

现在,我只是发布了这个问题.我今天晚些时候会在这个问题上采取行动.如果您碰巧知道如何做到这一点 - 或者知道Devise前叉,我会很感激.

Answer 1

我在Rails 4中完成了这个,只需在创建表时将id列设置为uuid数据类型,并且没有其他配置发生任何变化.即.不要创建名为'uuid'的列,只需将'id'列的类型更改为uuid.