无法扩展struct - 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,我一直收到此错误.locations_controller.ex == ** (CompileError) web/controllers/locations_controller.ex:5: Locations.__struct__/1 is undefined, cannot expand struct Locations.顺便说一下,我是elixir的新手,所以我可能做了一些非常明显错误的事情.

这是我的代码:

locations.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

视图

<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

就像我说我收到这个错误:

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

Answer 1

Elixir中的模块需要以其全名或其名称来引用alias.您可以将全部更改Locations为AwesomeLunch.Locations,或者如果要使用较短的名称,则可以调用alias该模块:

defmodule AwesomeLunch.LocationsController do
  alias AwesomeLunch.Locations

  ...
end