Elixir 外星建筑协会don'；不要把记录联系起来

我有一个简单的用户/手机应用程序，每个用户都有许多手机

模型定义如下：

user.ex

defmodule UserManager.User do
  use Ecto.Schema

  schema "users" do
    field :email, :string
    has_many :phones, UserManager.Phone
  end

end

defmodule UserManager.Phone do
  use Ecto.Schema

  schema "phones" do
    field :phone_number, :string
    field :phone_status, :string, default: "open"
    belongs_to :user, UserManager.User
  end

end

defmodule UserManager.Repo.Migrations.CreateUser do
  use Ecto.Migration

  def change do
    create table(:users) do
      add :email, :string
    end
  end
end

defmodule UserManager.Repo.Migrations.CreatePhone do
  use Ecto.Migration

  def change do
    create table(:phones) do
      add :phone_number, :string
      add :phone_status, :string
    end
  end
end

defmodule UserManager.Repo.Migrations.PhoneBelongsToUser do
  use Ecto.Migration

  def change do
    alter table(:phones) do
      add :user_id, references(:users)
    end

  end
end

phone.ex

defmodule UserManager.User do
  use Ecto.Schema

  schema "users" do
    field :email, :string
    has_many :phones, UserManager.Phone
  end

end

defmodule UserManager.Phone do
  use Ecto.Schema

  schema "phones" do
    field :phone_number, :string
    field :phone_status, :string, default: "open"
    belongs_to :user, UserManager.User
  end

end

defmodule UserManager.Repo.Migrations.CreateUser do
  use Ecto.Migration

  def change do
    create table(:users) do
      add :email, :string
    end
  end
end

defmodule UserManager.Repo.Migrations.CreatePhone do
  use Ecto.Migration

  def change do
    create table(:phones) do
      add :phone_number, :string
      add :phone_status, :string
    end
  end
end

defmodule UserManager.Repo.Migrations.PhoneBelongsToUser do
  use Ecto.Migration

  def change do
    alter table(:phones) do
      add :user_id, references(:users)
    end

  end
end

迁移

创建用户。ex

defmodule UserManager.User do
  use Ecto.Schema

  schema "users" do
    field :email, :string
    has_many :phones, UserManager.Phone
  end

end

defmodule UserManager.Phone do
  use Ecto.Schema

  schema "phones" do
    field :phone_number, :string
    field :phone_status, :string, default: "open"
    belongs_to :user, UserManager.User
  end

end

defmodule UserManager.Repo.Migrations.CreateUser do
  use Ecto.Migration

  def change do
    create table(:users) do
      add :email, :string
    end
  end
end

defmodule UserManager.Repo.Migrations.CreatePhone do
  use Ecto.Migration

  def change do
    create table(:phones) do
      add :phone_number, :string
      add :phone_status, :string
    end
  end
end

defmodule UserManager.Repo.Migrations.PhoneBelongsToUser do
  use Ecto.Migration

  def change do
    alter table(:phones) do
      add :user_id, references(:users)
    end

  end
end

创建_phone.ex

defmodule UserManager.User do
  use Ecto.Schema

  schema "users" do
    field :email, :string
    has_many :phones, UserManager.Phone
  end

end

defmodule UserManager.Phone do
  use Ecto.Schema

  schema "phones" do
    field :phone_number, :string
    field :phone_status, :string, default: "open"
    belongs_to :user, UserManager.User
  end

end

defmodule UserManager.Repo.Migrations.CreateUser do
  use Ecto.Migration

  def change do
    create table(:users) do
      add :email, :string
    end
  end
end

defmodule UserManager.Repo.Migrations.CreatePhone do
  use Ecto.Migration

  def change do
    create table(:phones) do
      add :phone_number, :string
      add :phone_status, :string
    end
  end
end

defmodule UserManager.Repo.Migrations.PhoneBelongsToUser do
  use Ecto.Migration

  def change do
    alter table(:phones) do
      add :user_id, references(:users)
    end

  end
end

手机属于用户。ex

defmodule UserManager.User do
  use Ecto.Schema

  schema "users" do
    field :email, :string
    has_many :phones, UserManager.Phone
  end

end

defmodule UserManager.Phone do
  use Ecto.Schema

  schema "phones" do
    field :phone_number, :string
    field :phone_status, :string, default: "open"
    belongs_to :user, UserManager.User
  end

end

defmodule UserManager.Repo.Migrations.CreateUser do
  use Ecto.Migration

  def change do
    create table(:users) do
      add :email, :string
    end
  end
end

defmodule UserManager.Repo.Migrations.CreatePhone do
  use Ecto.Migration

  def change do
    create table(:phones) do
      add :phone_number, :string
      add :phone_status, :string
    end
  end
end

defmodule UserManager.Repo.Migrations.PhoneBelongsToUser do
  use Ecto.Migration

  def change do
    alter table(:phones) do
      add :user_id, references(:users)
    end

  end
end

在iex上按如下方式运行代码：

alias UserManager.{Repo, User, Phone}
user = %User{email: "john@mail.com"}
Repo.insert!(user)

直到现在一切都运转良好。。。但是当我运行

exto.build\u assoc

elixir时，不要将手机与用户关联为什么？--ps：代码没有引发任何异常--

---

缺少的是在完成

Repo.insert之后使用
user=Repo.get（user，1）
获取用户！（用户）

。只有到那时，才能执行“外部构建”assoc

什么是“代码>行”？你什么时候打电话给

build\u assoc/3

？你检查过了吗？“行”是一个错误，它应该写“用户”。我已经正确地编辑了这个问题。我怀疑给DB打一个多余的电话是一个好方法<代码>%用户{电子邮件：john@mail.com“}|>build|assoc（：电话，电话号码：“052-8888”）|>Repo.insert！（）应该足够好了。