编译错误-User .__ struct __ / 1未定义，无法扩展struct User

Question

我正在按照Programming Phoenix 1.4书构建一个简单的应用程序。

添加逻辑以创建新用户时，出现此错误：

== Compilation error in file lib/rumbl_web/controllers/user_controller.ex ==
** (CompileError) lib/rumbl_web/controllers/user_controller.ex:19: Rubml.Accounts.User.__struct__/1 is undefined, cannot expand struct Rubml.Accounts.User. Make sure the struct name is correct. If the struct name exists and is correct but it still cannot be found, you likely have cyclic module usage in your code
    (stdlib 3.12.1) lists.erl:1354: :lists.mapfoldl/3
    lib/rumbl_web/controllers/user_controller.ex:18: (module)
    (stdlib 3.12.1) erl_eval.erl:680: :erl_eval.do_apply/6

我已经仔细检查过，不认为​​我没有错过任何内容，也没有错别字。

这里是我的控制器：

defmodule RumblWeb.UserController do
    use RumblWeb, :controller

    alias Rumbl.Accounts
    alias Rubml.Accounts.User

    def index(conn, _params) do
        users = Accounts.list_users()
        # IO.puts users
        render(conn, "index.html", users: users)
    end

    def show(conn, %{"id" => id}) do
        user = Accounts.get_user(id)
        render(conn, "show.html", user: user)
    end

    def new(conn, _params) do
        changeset = Accounts.change_user(%User{})
        render(conn, "new.html", changeset: changeset)
    end
end

和用户模型：

defmodule Rumbl.Accounts.User do
    use Ecto.Schema
    import Ecto.Changeset

    schema "users" do
        field :name, :string
        field :username, :string

        timestamps()
    end

    def changeset(user, attrs) do
        user
        |> cast(attrs, [:name, :username])
        |> validate_required([:name, :username])
        |> validate_length(:username, min: 1, max: 20)
    end
end

如果有人想浏览，这里是回购链接：https://github.com/niranjans/rumbl

Answer 1