如何使用工厂创建 Elixir 连接表？ （Postgrex.Error）错误 23502（not_null_violation）“inserted_at”列中存在空值

Question

我正在尝试完成一个测试，当且仅当用户具有“处方审批角色”角色并具有“approve_scripts”权限时，用户才能创建处方。为了完成测试，我使用 ex_machina for elixir 设置了以下工厂：

      def user_factory do
        %User{
          id: Ecto.UUID.generate(),
          emr_id: Ecto.UUID.generate(),
          username: sequence(:user_username, &"user-#{&1})"),
          name_first: sequence(:user_name_first, &"user-#{&1})"),
          name_middle: sequence(:user_name_middle, &"user-#{&1})"),
          name_last: sequence(:user_name_last, &"user-#{&1})"),
          roles: [build(:role)],
          type: "practice"
        }
      end

      def permission_factory do
        %Permission{
          key: "approve_scripts",
          label: "Prescription Approval Permission",
          description: "Permission to approve scripts"
        }
      end

      def role_factory do
        %Role{
          label: "Prescription Approval Role",
          description: "Role needed to approve prescriptions",
          permissions: [build(:permission)]
        }
      end

这是对应并映射到我的工厂的模式：

schema "users" do
    field :emr_id, :string
    field :username, :string
    field :name_first, :string
    field :name_middle, :string
    field :name_last, :string
    field :type, Ecto.Enum, values: @user_types

    many_to_many :roles, Role, join_through: "users_roles", on_replace: :delete

    has_many :permissions, through: [:roles, :permissions]

    timestamps()
  end

   schema "roles" do
    field :label, :string
    field :description, :string

    many_to_many(:permissions, Permission,
      join_through: "roles_permissions",
      join_keys: [role_id: :id, permission_key: :key],
      on_replace: :delete
    )

    many_to_many(:users, User, join_through: "users_roles")

    timestamps()
  end
   
  schema "permissions" do
    field :label, :string
    field :description, :string

    timestamps()
  end

当我创建任何使用

insert(:user)

的测试时，我收到以下错误：

    ** (Postgrex.Error) ERROR 23502 (not_null_violation) null value in column "inserted_at" of relation "roles_permissions" violates not-null constraint

         table: roles_permissions
         column: inserted_at

     Failing row contains (a63ceb35-3e7f-428d-8328-05e05a3fe6bb, approve_scripts, null, null).

这个问题对我来说很简单。基本上，

roles_permissions

的基础连接表没有

inserted_at

或

updated_at

字段。但是，我不知道需要做什么来解决这个问题。我认为这些字段会自动插入，所以它们为什么会是

null

是没有意义的。我需要创建

roles_permissions

文件和表格吗？任何帮助或指导将不胜感激，谢谢。

编辑

这是 Elixir 代码中当前的数据库模式：

create table(:users) do
      add :emr_id, :citext
      add :username, :citext, null: false
      add :name_first, :text, null: false
      add :name_middle, :text
      add :name_last, :text, null: false
      add :type, :user_type, null: false
      timestamps()
    end

    create table("roles") do
      add :label, :text, null: false
      add :description, :text, null: false
      timestamps()
    end

    create table("permissions", primary_key: false) do
      add :key, :text, primary_key: true
      add :label, :text, null: false
      add :description, :text, null: false
      timestamps()
    end

    create table("roles_permissions", primary_key: false) do
      add :role_id, references(:roles), primary_key: true
      add :permission_key, references(:permissions, column: :key, type: :text), primary_key: true
      timestamps()
    end

    create table("users_roles", primary_key: false) do
      add :user_id, references(:users), primary_key: true
      add :role_id, references(:roles), primary_key: true
      timestamps()
    end
  end

Answer 1

您可以将其添加到工厂，以便它将随机日期时间添加到时间戳中：

timestamps = 
    DateTime.utc_now()
    |> DateTime.add(-Enum.random(0..10_000), :second)
    |> DateTime.truncate(:second)

    %Permission{
              key: "approve_scripts",
              label: "Prescription Approval Permission",
              description: "Permission to approve scripts"
              inserted_at: timestamps,
              updated_at: timestamps
            }