struct - 无法扩展结构 - Elixir /Phoenix

Question

我正在尝试在屏幕上显示一个表单。但是当我尝试启动服务器时，我不断收到此错误。 locations_controller.ex ==
** (CompileError) web/controllers/locations_controller.ex:5: Locations.__struct__/1 is undefined, cannot expand struct Locations .顺便说一句，我是 Elixir 的新手，所以我可能在做一些非常明显的错误。

这是我的代码:

位置.controller.ex

 def new(conn, _params) do
    changeset = Locations.changeset(%Locations{})

    render conn, "new.html", changeset: changeset
  end

  def create(conn, %{"locations" => %{ "start" => start, "end" => finish }}) do
    changeset = %AwesomeLunch.Locations{start: start, end: finish}
    Repo.insert(changeset)

    redirect conn, to: locations_path(conn, :index)
  end

看法

<h1>Hey There</h1>

<%= form_for @changeset, locations_path(@conn, :create), fn f -> %>

  <label>
    Start: <%= text_input f, :start %>
  </label>

  <label>
    End: <%= text_input f, :end %>
  </label>

  <%= submit "Pick An Awesome Lunch" %>

<% end %>

模型

    defmodule AwesomeLunch.Locations do
  use AwesomeLunch.Web, :model

  use Ecto.Schema
  import Ecto.Changeset

  schema "locations" do
    field :start
    field :end
  end

  def changeset(struct, params \\ %{}) do
    struct
    |> cast(params, [:start, :end])
    |> validate_required([:start, :end])
  end
end

就像我说的那样，我收到了这个错误:

    locations_controller.ex ==
** (CompileError) web/controllers/locations_controller.ex:5: Locations.__struct__/1 is undefined, cannot expand struct Locations

Answer 1

Elixir 中的模块需要用它们的全名或 alias 来引用。其中。您可以更改所有 Locations至AwesomeLunch.Locations ，或者如果您想使用更短的名称，您可以调用 alias在该模块中:

defmodule AwesomeLunch.LocationsController do
  alias AwesomeLunch.Locations

  ...
end