POST 时的 Phoenix.ActionClauseError，没有匹配的操作子句来处理请求

问题描述

每当我 POST 到/api/subastas 时，我都会收到这个错误

I'm receiving this error whenever I POST to /api/subastas

Phoenix.ActionClauseError at POST /api/subastas/ bad request to IascSubastas.SubastaController.create, no matching action clause to process request

如果我运行 mix phoenix.routes，我会看到 :create 正确路由到 POST/api/subastas

If I run mix phoenix.routes I see that :create is correctly routed to POST /api/subastas

这是 router.ex

This is the router.ex

defmodule IascSubastas.Router do
  use IascSubastas.Web, :router

  pipeline :browser do
    plug :accepts, ["html"]
    plug :fetch_session
    plug :fetch_flash
    plug :protect_from_forgery
    plug :put_secure_browser_headers
  end

  pipeline :api do
    plug :accepts, ["json"]
  end

  scope "/", IascSubastas do
    pipe_through :browser # Use the default browser stack

    get "/", PageController, :index
  end

  # Other scopes may use custom stacks.
  scope "/api", IascSubastas do
    pipe_through :api

    resources "/subastas", SubastaController, except: [:new, :edit] do
      post "/cancelar", SubastaController, :cancelar
      resources "/ofertas", OfertaController, except: [:new, :edit]
    end
  end
end

和 SubastaController

and SubastaController

defmodule IascSubastas.SubastaController do
  use IascSubastas.Web, :controller

  alias IascSubastas.Subasta

  def index(conn, _params) do
    subastas = Repo.all from s in Subasta, preload: [:mejor_oferta]
    render(conn, "index.json", subastas: subastas)
  end

  def show(conn, %{"id" => id}) do
    subasta = Repo.get!(Subasta, id) |> Repo.preload(:mejor_oferta)
    render(conn, "show.json", subasta: subasta)
  end

  def create(conn, %{"subasta" => subasta_params}) do
    changeset = Subasta.changeset(%Subasta{mejor_oferta: nil}, subasta_params)

    case Repo.insert(changeset) do
      {:ok, subasta} ->
        conn
        |> put_status(:created)
        |> put_resp_header("location", subasta_path(conn, :show, subasta))
        |> render("show.json", subasta: subasta)
      {:error, changeset} ->
        conn
        |> put_status(:unprocessable_entity)
        |> render(IascSubastas.ChangesetView, "error.json", changeset: changeset)
    end
  end

  def update(conn, %{"id" => id, "subasta" => subasta_params}) do
    subasta = Repo.get!(Subasta, id) |> Repo.preload(:mejor_oferta)
    changeset = Subasta.changeset(subasta, subasta_params)

    case Repo.update(changeset) do
      {:ok, subasta} ->
        render(conn, "show.json", subasta: subasta)
      {:error, changeset} ->
        conn
        |> put_status(:unprocessable_entity)
        |> render(IascSubastas.ChangesetView, "error.json", changeset: changeset)
    end
  end

  def cancelar(conn, %{"subasta_id" => id}) do
    subasta = Repo.get!(Subasta, id) |> Repo.preload(:mejor_oferta)
    changeset = Subasta.changeset(subasta, %{terminada: true})

    case Repo.update(changeset) do
      {:ok, subasta} ->
        render(conn, "show.json", subasta: subasta)
      {:error, changeset} ->
        conn
        |> put_status(:unprocessable_entity)
        |> render(IascSubastas.ChangesetView, "error.json", changeset: changeset)
    end
  end

  def delete(conn, %{"id" => id}) do
    subasta = Repo.get!(Subasta, id)

    # Here we use delete! (with a bang) because we expect
    # it to always work (and if it does not, it will raise).
    Repo.delete!(subasta)

    send_resp(conn, :no_content, "")
  end
end

我只在 http://localhost:4000/api/subastas/ 出现错误，任何其他 URL 都可以正常工作.

I only get the error at http://localhost:4000/api/subastas/, any other URL works good.

推荐答案

POST 中缺少 content_type！应用程序/json"

content_type was missing in POST! "application/json"

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