Rails Arel 单元测试错误

问题描述

我有以下错误:

ERROR["test_character_should_be_valid", CharacterTest, 0.214787]test_character_should_be_valid#CharacterTest (0.21s)NoMethodError:NoMethodError:$1"的未定义方法`val':Arel::Nodes::BindParamapp/models/user.rb:11:in `block in '测试/模型/character_test.rb:8:在设置"中

来自以下测试:test/models/character_test.rb:

 需要 'test_helper'类 CharacterTest <ActiveSupport::TestCase定义设置@user = User.new(name: "Example User", email: "[email protected]", callsign: "example",密码:foobar"，password_confirmation:foobar")@user.save@character = @user.character结尾测试字符应该有效"做断言@character.valid?结尾结束 # 字符测试

在 gemfile 中:

gem 'arel', '6.0.0.beta2'

character.rb:

class 字符 <ActiveRecord::Base归属地:社交，多态:真结尾

user.rb:

class User 

我找不到有关此特定 arel 错误的任何信息.我的 arel gem 是 6.0.0.beta2，它似乎解决了其他问题(如 此处).以前有人见过这样的吗?

解决方案

事实证明这不是 Arel 错误 - 这是因为列 sociable_id 和 sociable_type没有在架构中定义.我愚蠢的错误.由于缺少外键，Arel 引发了异常.但是，Arel 此处有改进的错误消息:https://github.com/rails/rails/commit/78bd18a90992e3459d78bd18a90992e3459d767a

I have the following error:

ERROR["test_character_should_be_valid", CharacterTest, 0.214787]
test_character_should_be_valid#CharacterTest (0.21s)
NoMethodError:         NoMethodError: undefined method `val' for "$1":Arel::Nodes::BindParam
app/models/user.rb:11:in `block in <class:User>'
test/models/character_test.rb:8:in `setup'

From the following test: test/models/character_test.rb:

    require 'test_helper'

    class CharacterTest < ActiveSupport::TestCase

      def setup
        @user = User.new(name: "Example User", email: "[email protected]", callsign: "example",
                         password: "foobar", password_confirmation: "foobar")
        @user.save
        @character = @user.character
      end

      test "character should be valid" do
        assert @character.valid?
      end

    end # CharacterTest

In the gemfile:

gem 'arel', '6.0.0.beta2'

character.rb:

class Character < ActiveRecord::Base
  belongs_to :sociable, polymorphic: true
end

user.rb:

class User < ActiveRecord::Base

  has_one  :character, as: :sociable

  before_validation do
    self.create_character unless character # line 11
  end
  .
  .
end

I can't find anything about this particular arel error. My arel gem is 6.0.0.beta2, which seems to fix other problems (as in here). Has anyone seen anything like this before?

解决方案

It turns out this isn't an Arel error - it's because the columns sociable_id and sociable_typeweren't defined in the schema. My stupid mistake. Arel was raising an exception because the foreign key was missing. However there is an improved error message at Arel here:https://github.com/rails/rails/commit/78bd18a90992e3da767cfe492f1bc5d63077da8a

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