Cannot expand struct - elixir/phoenix

Question

I'm trying to display a form on the screen. But I keep getting this error when I try to start the server. locations_controller.ex == ** (CompileError) web/controllers/locations_controller.ex:5: Locations.__struct__/1 is undefined, cannot expand struct Locations. BTW I'm new to elixir so I'm probably doing something really obvious wrong.

Here is my code:

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

VIEW

<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 %>

model

    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

Like I said I'm getting this error:

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

Answer 1

Modules in Elixir need to be referred to by their full name or an alias of it. You can either change all Locations to AwesomeLunch.Locations, or if you want to use a shorter name, you can call alias in that module:

defmodule AwesomeLunch.LocationsController do
  alias AwesomeLunch.Locations

  ...
end