没有匹配Eto.Changeset.cast/4中的函数子句

Question

我被“天真时间”的选角错误困住了。有人能帮我解锁吗？

这是我想要做的POST请求: URL：http://localhost:4000/api/workingtimes/1

正文：

{“开始”："2019-08-21 07:27:00"，“结束”："2020-09-20 07:27:00“}

下面是我的模式：

 defmodule TimeManager.Workingtimes.Workingtime do
  use Ecto.Schema
  import Ecto.Changeset

  schema "workingtimes" do
    field :start, :naive_datetime
    field :end, :naive_datetime
    belongs_to :user, TimeManager.Users.User

    timestamps()
  end

  @doc false
  def changeset(workingtime, attrs) do
    workingtime
    |> cast(attrs, [:start, :end, :user_id])
    |> validate_required([:start, :end, :user_id])
    |> assoc_constraint(:user)
  end
end

下面是我在控制器中的创建函数：

  def create(conn, workingtime_params) do
    with {:ok, %Workingtime{} = workingtime} <- Workingtimes.create_workingtime(workingtime_params) do
      conn
      |> put_status(:created)
      |> put_resp_header("location", Routes.workingtime_path(conn, :show, workingtime))
      |> render("workingtime.json", workingtime: workingtime)
    end
  end

最后，这里是我的create_workingtime函数在我的workingtimes.ex

  def create_workingtime(attrs \\ %{}) do
    %{"start" => starttime, "end" => endtime, "user_id"=>user_id } = attrs
    {:ok, naivestart} = NaiveDateTime.from_iso8601(starttime)
    {:ok, naiveend} = NaiveDateTime.from_iso8601(endtime)
    attrs = %{"start" => naivestart, "end"=>naiveend, "user_id"=>user_id}
  
    Workingtime
    |> Workingtime.changeset(attrs)
    |> Repo.insert()
  end

日志中的错误是：

• (退出)引发了一个例外情况：** (FunctionClauseError)没有匹配Exto.Changeset.cast/4(ecto3.5.2) lib/ecto/changeset.ex:461：=> %{"end“=> ~N 2020-10-21 19:45:24.879000，"start”=> ~N 2020-10-21 19:45:24.879000，"user_id“=>1}，”开始“，”结束“，:user_id，lib/time_manager/workingtimes/workingtime.ex:16: TimeManager.Workingtimes.Workingtime.changeset/2 (time_manager 0.1.0) lib/time_manager/workingtimes.ex:63: TimeManager.Workingtimes.create_workingtime/1 (time_manager 0.1.0) lib/time_manager_web/controllers/workingtime_controller.ex:16: TimeManagerWeb.WorkingtimeController.create/2 (time_manager 0.1.0) lib/time_time_manager_time_manager_web:1: TimeManagerWeb.WorkingtimeController.action/2 ( lib/time_manager_web/controllers/workingtime_controller.ex:1: TimeManagerWeb.WorkingtimeController.phoenix_controller_pipeline/2 0.1.0)

Answer 1

演员/4将模式结构作为第一个参数，而不是模式模块。在您的create_workingtime/1函数中，尝试更改为：

%Workingtime{}
|> Workingtime.changeset(attrs)
|> Repo.insert()

Answer 2

发现了这个问题，在create_workingtime函数中，它是：% Workingtime {}

  def create_workingtime(attrs \\ %{}) do
    %{"start" => starttime, "end" => endtime, "user_id"=>user_id } = attrs
    {:ok, naivestart} = NaiveDateTime.from_iso8601(starttime)
    {:ok, naiveend} = NaiveDateTime.from_iso8601(endtime)
    attrs = %{"start" => naivestart, "end"=>naiveend, "user_id"=>user_id}
  
    %Workingtime{}
    |> Workingtime.changeset(attrs)
    |> Repo.insert()
  end