Question

我的问题是为db-table实现良好的枚举属性。给出以下def类：

class PlayerLicense < ApplicationRecord
  belongs_to :user
  belongs_to :team

  enum defaultDress: { black: 1, white: 2, :substitute => 3 }
  validates :defaultDress, 
            presence: true,
            inclusion: { in:  defaultDresses.keys}

  enum defaultPosition: { :defense => 1,  :forwarder => 2,  :center => 3,  :goalie => 4 }
  validates :defaultPosition,
            presence: true,
            inclusion: { in: defaultPositions.keys }

end

在浏览器提交（POST）之后，这是我的Rails服务器POST日志：

Started POST "/player_licenses" for 127.0.0.1 at 2018-07-11 19:12:34 -0400

Processing by PlayerLicensesController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"Gn4BmF4.......V1x50CYD0GknQJNQ==", "team_id"=>"7", "player_license"=>{"user_id"=>"6", "defaultDress"=>"2", "defaultPosition"=>"2"}, "commit"=>"assign this player to 'Smithfield guys' team"}
  User Load (0.8ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT ?  [["id", 17], ["LIMIT", 1]]
Completed 401 Unauthorized in 6ms (ActiveRecord: 0.8ms)



ArgumentError ('2' is not a valid defaultDress):

activerecord (5.1.4) lib/active_record/enum.rb:139:in `assert_valid_value'
activerecord (5.1.4) lib/active_record/attribute.rb:67:in `with_value_from_user'
activerecord (5.1.4) lib/active_record/attribute_set.rb:54:in `write_from_user'
activerecord (5.1.4) lib/active_record/attribute_methods/write.rb:39:in `write_attribute'
activerecord (5.1.4) lib/active_record/attribute_methods/write.rb:20:in `__temp__4656661657c6474427563737='
activemodel (5.1.4) lib/active_model/attribute_assignment.rb:46:in `public_send'
activemodel (5.1.4) lib/active_model/attribute_assignment.rb:46:in `_assign_attribute'
activemodel (5.1.4) lib/active_model/attribute_assignment.rb:40:in `block in _assign_attributes'
activemodel (5.1.4) lib/active_model/attribute_assignment.rb:39:in `each'
activemodel (5.1.4) lib/active_model/attribute_assignment.rb:39:in `_assign_attributes'
activerecord (5.1.4) lib/active_record/attribute_assignment.rb:26:in `_assign_attributes'
activemodel (5.1.4) lib/active_model/attribute_assignment.rb:33:in `assign_attributes'
activerecord (5.1.4) lib/active_record/core.rb:337:in `initialize'

在此示例中，到目前为止，来自浏览器的参数都很好，然后enum.rb assert_valid_value获得正确的值（2），但类型错误（got：字符串，必须为：integer）。这就是assert_valid_value中出现ArgumentError的原因。

在Rails控制台中，一切正常，属性/值分配，验证，object.save / read正常运行。在db级上检查（在从rails控制台发出object.save之后）验证DB-Table中正确的数据记录。这到底是什么（帕拉姆斯演员？），有人可以帮忙，请提供一些有关原因和解决方案的想法吗？谢谢你，哈里。

Answer 1

问题似乎出在您的表单实现上。而不是发送枚举键（字符串），而是发送枚举值（整数）。

而不是...

<%= f.select :defaultDress, PlayerLicense.defaultDresses ... %>

使用

<%= f.select :defaultDress, PlayerLicense.defaultDresses.keys ... %>

enum.rb中的ArgumentError：139：`assert_valid_value'

1 个答案: