我想修改 Devise 以使其与带有 PostgreSQL 的 UUID 主键的用户表一起使用。
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="#")
如您在上面看到的,user_signed_in?已损坏。我预计从“正常”自动递增 ID 到 UUID 需要进行一些更改。
现在,我只是发布问题。我将在今天晚些时候对此进行讨论。如果您碰巧知道如何做到这一点——或者知道 Devise fork,我将不胜感激。