Elixir 凤凰金丝雀没有找到

我在我的phoenix应用程序中使用

我在config.exs中写道：

config :canary, repo: MyApp.Repo,
      unauthorized_handler: {MyApp.Helpers, :handle_unauthorized},
      not_found_handler: {MyApp.Helpers, :handle_not_found}

并创建了帮助程序：

defmodule MyApp.Helpers do
  use Phoenix.Controller

  require Logger
  import Plug.Conn

  def handle_unauthorized(conn) do
    conn
    |> put_status(401)
    |> put_view(MyApp.ErrorView)
    |> render("401.json")
    |> halt
  end

  def handle_not_found(conn) do
    conn
    |> put_status(404)
    |> put_view(MyApp.ErrorView)
    |> render("404.json")
    |> halt
  end
end

我的能力。例如：

defimpl Canada.Can, for: MyApp.User do
  alias MyApp.Operation
  alias MyApp.User

  def can?(user, action, operation = %Operation{})  when action in [:show, :update, :delete] do
    IO.puts "check ability for operation"
    if operation.user_id == user.id do
      IO.puts "success"
      true
    else
      false
    end
  end

  def can?(subject, action, resource) do
    raise """
    Unimplemented authorization check for User!  To fix see below...

    Please implement `can?` for User in #{__ENV__.file}.

    The function should match:

    subject:  #{inspect subject}

    action:   #{action}

    resource: #{inspect resource}
    """
  end
end

未经授权的处理程序工作正常。但未找到\u处理程序不工作

[error] #PID<0.709.0> running MyApp.Endpoint terminated
Server: localhost:4000 (http)
Request: GET /api/v1/operations/11
** (exit) an exception was raised:
    ** (RuntimeError) Unimplemented authorization check for User!  To fix see below...

Please implement `can?` for User in /home/mars/phoenix_projects/my_app/lib/abilities.ex.

如果找不到资源，我将被称为handle\u unauthorized

如果我离开就好了

def can?(user, action, operation = %Operation{}) when action in [:show, :update, :delete] do

那我就错了

(FunctionClauseError) no function clause matching in Canada.Can.MyApp.User.can?/3

我不明白如何为这种情况编写函数

Upd:完整错误消息：

[error] #PID<0.427.0> running MyApp.Endpoint terminated
Server: localhost:4000 (http)
Request: GET /api/v1/operations/11
** (exit) an exception was raised:
    ** (RuntimeError) Unimplemented authorization check for User!  To fix see below...

Please implement `can?` for User in /home/mars/phoenix_projects/my_app/lib/abilities.ex.

The function should match:

subject:  %MyApp.User{__meta__: #Ecto.Schema.Metadata<:loaded, "users">, operations: [%MyApp.Operation{__meta__: #Ecto.Schema.Metadata<:loaded, "operations">, balance: 1.3e3, categories: #Ecto.Association.NotLoaded<association :categories is not loaded>, id: 1, inserted_at: ~N[2017-04-15 15:00:38.727984], name: "new name", updated_at: ~N[2017-04-15 15:45:08.860944], users: #Ecto.Association.NotLoaded<association :users is not loaded>}, %MyApp.Operation{__meta__: #Ecto.Schema.Metadata<:loaded, "operations">, balance: 0.0, categories: #Ecto.Association.NotLoaded<association :categories is not loaded>, id: 2, inserted_at: ~N[2017-04-15 15:00:59.396742], name: "test1", updated_at: ~N[2017-04-15 15:00:59.396747], users: #Ecto.Association.NotLoaded<association :users is not loaded>}, %MyApp.Operation{__meta__: #Ecto.Schema.Metadata<:loaded, "operations">, balance: 0.0, categories: #Ecto.Association.NotLoaded<association :categories is not loaded>, id: 3, inserted_at: ~N[2017-04-15 15:01:56.845078], name: "test0", updated_at: ~N[2017-04-15 15:01:56.845085], users: #Ecto.Association.NotLoaded<association :users is not loaded>}, %MyApp.Operation{__meta__: #Ecto.Schema.Metadata<:loaded, "operations">, balance: 0.0, categories: #Ecto.Association.NotLoaded<association :categories is not loaded>, id: 4, inserted_at: ~N[2017-04-15 15:04:25.647952], name: "testtt", updated_at: ~N[2017-04-15 15:04:25.647958], users: #Ecto.Association.NotLoaded<association :users is not loaded>}], confirmation_token: nil, confirmed: false, id: 1, inserted_at: ~N[2017-04-15 14:58:48.263515], login: "test user0", password: nil, password_confirmation: nil, password_hash: "$2b$12$8yt6WNBt5hyxZE1MqiZtX.YRuReOuy4zom1imQvK2Q.Dw6pc8iNSG", reset_password_token: nil, sessions: #Ecto.Association.NotLoaded<association :sessions is not loaded>, updated_at: ~N[2017-04-15 14:58:48.268564]}

action:   show

resource: nil

        (my_app) lib/abilities.ex:43: Canada.Can.MyApp.User.can?/3
        (canary) lib/canary/plugs.ex:214: Canary.Plugs.do_authorize_resource/2
        (canary) lib/canary/plugs.ex:187: Canary.Plugs.authorize_resource/2
        (canary) lib/canary/plugs.ex:274: Canary.Plugs.do_load_and_authorize_resource/2
        (my_app) web/controllers/v1/operation_controller.ex:1: MyApp.V1.OperationController.phoenix_controller_pipeline/2
        (my_app) lib/my_app/endpoint.ex:1: MyApp.Endpoint.instrument/4
        (my_app) lib/phoenix/router.ex:261: MyApp.Router.dispatch/2
        (my_app) web/router.ex:1: MyApp.Router.do_call/2
        (my_app) lib/my_app/endpoint.ex:1: MyApp.Endpoint.phoenix_pipeline/1
        (my_app) lib/plug/debugger.ex:123: MyApp.Endpoint."call (overridable 3)"/2
        (my_app) lib/my_app/endpoint.ex:1: MyApp.Endpoint.call/2
        (plug) lib/plug/adapters/cowboy/handler.ex:15: Plug.Adapters.Cowboy.Handler.upgrade/4
        (cowboy) /home/mars/phoenix_projects/my_app/deps/cowboy/src/cowboy_protocol.erl:442: :cowboy_protocol.execute/4

[错误]#运行MyApp的PID。终结点已终止
服务器：本地主机：4000（http）
请求：GET/api/v1/operations/11
**（退出）引发了一个异常：
**（RuntimeError）未对用户执行授权检查！要修复此问题，请参见下文。。。
请为/home/mars/phoenix_projects/my_app/lib/abilities.ex中的用户实现'can？'。
功能应匹配：
主题：%MyApp.User{uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu.Schema.Metadata，余额：1.3e3，类别：{uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu.eto.Association.NotLoaded，id:1，插入地址：~N[2017-04-15:00:38.727984]，名称：“新名称”，更新地址：~N[2017-04-15:15:45:08.944]，用户：{uuuuuuuuuuuuuuuuuuuuuuuu{uuuuu meta_uuuuu:#exto.Schema.Metadata，余额：0.0，类别：#exto.Association.NotLoaded，id:2，插入地址：~N[2017-04-15 15 15:00:59.396742]，名称：“test1”，更新地址：~N[2017-04-15:00:59.396747]，用户：#exto.Association.NotLoaded}，%MyApp.Operation{{uuuuuuu meta_uuuuuuu:#exto.Schema.Metadata，余额：0.0，类别：#exto.Association.NotLoaded，id:3，插入地址：~N[2017-04-15 15 15:01:56.845078]，名称：“test0”，更新地址：~N[2017-04-15:01:56.845085]，用户：#exto.Association.NotLoaded}，%MyApp.Operation{uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu.meta.Schema.Metadata，余额：0.0，类别：uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu“测试用户0”，密码：nil，密码确认：nil，密码散列：“$2b$12$8yt6WNBt5hyxZE1MqiZtX.YRuReOuy4zom1imQvK2Q.Dw6pc8iNSG”，重置密码\u令牌：nil，会话：#Ecto.Association.NotLoaded，更新地址：~N[2017-04-15 14:58:48.268564]]
行动：表演
资源：无
（我的应用程序）lib/abilities.ex:43:Canada.Can.MyApp.User.Can？/3
（canary）lib/canary/plugs.ex:214:canary.plugs.do\u authorize\u resource/2
（canary）lib/canary/plugs.ex:187:canary.plugs.authorize_资源/2
（canary）lib/canary/plugs.ex:274:canary.plugs.do_load_和_authorize_资源/2
（my_app）web/controllers/v1/operation_controller.ex:1:MyApp.v1.OperationController.phoenix_controller_管道/2
（my_app）lib/my_app/endpoint.ex:1:MyApp.endpoint.instrument/4
（我的应用程序）lib/phoenix/router.ex:261:MyApp.router.dispatch/2
（my_应用程序）web/router.ex:1:MyApp.router.do_call/2
（my_app）lib/my_app/endpoint.ex:1:MyApp.endpoint.phoenix_管道/1
（my_app）lib/plug/debugger.ex:123:MyApp.Endpoint.“调用（可重写3）”/2
（my_app）lib/my_app/endpoint.ex:1:MyApp.endpoint.call/2
（plug）lib/plug/adapters/cowboy/handler.ex:15:plug.adapters.cowboy.handler.upgrade/4
（牛仔）/home/mars/phoenix_projects/my_app/deps/cowboy/src/cowboy_protocol.erl:442:：cowboy_protocol.execute/4

如果您为

can返回true（，，nil）

function子句，这将允许通过授权和句柄未找到插头来正确设置

conn

。

您可以发布完整的错误消息吗？它还应该打印主题、操作和资源的实际值，这将有助于使这个问题更清楚。@Dogbert，我使用Canary已经有一段时间了。我建议您尝试返回

true

以获取nil资源。我相信这将允许未找到的代码运行。有关详细信息，请查看的工具。@StevePallen，谢谢，它可以工作！

[error] #PID<0.427.0> running MyApp.Endpoint terminated
Server: localhost:4000 (http)
Request: GET /api/v1/operations/11
** (exit) an exception was raised:
    ** (RuntimeError) Unimplemented authorization check for User!  To fix see below...

Please implement `can?` for User in /home/mars/phoenix_projects/my_app/lib/abilities.ex.

The function should match:

subject:  %MyApp.User{__meta__: #Ecto.Schema.Metadata<:loaded, "users">, operations: [%MyApp.Operation{__meta__: #Ecto.Schema.Metadata<:loaded, "operations">, balance: 1.3e3, categories: #Ecto.Association.NotLoaded<association :categories is not loaded>, id: 1, inserted_at: ~N[2017-04-15 15:00:38.727984], name: "new name", updated_at: ~N[2017-04-15 15:45:08.860944], users: #Ecto.Association.NotLoaded<association :users is not loaded>}, %MyApp.Operation{__meta__: #Ecto.Schema.Metadata<:loaded, "operations">, balance: 0.0, categories: #Ecto.Association.NotLoaded<association :categories is not loaded>, id: 2, inserted_at: ~N[2017-04-15 15:00:59.396742], name: "test1", updated_at: ~N[2017-04-15 15:00:59.396747], users: #Ecto.Association.NotLoaded<association :users is not loaded>}, %MyApp.Operation{__meta__: #Ecto.Schema.Metadata<:loaded, "operations">, balance: 0.0, categories: #Ecto.Association.NotLoaded<association :categories is not loaded>, id: 3, inserted_at: ~N[2017-04-15 15:01:56.845078], name: "test0", updated_at: ~N[2017-04-15 15:01:56.845085], users: #Ecto.Association.NotLoaded<association :users is not loaded>}, %MyApp.Operation{__meta__: #Ecto.Schema.Metadata<:loaded, "operations">, balance: 0.0, categories: #Ecto.Association.NotLoaded<association :categories is not loaded>, id: 4, inserted_at: ~N[2017-04-15 15:04:25.647952], name: "testtt", updated_at: ~N[2017-04-15 15:04:25.647958], users: #Ecto.Association.NotLoaded<association :users is not loaded>}], confirmation_token: nil, confirmed: false, id: 1, inserted_at: ~N[2017-04-15 14:58:48.263515], login: "test user0", password: nil, password_confirmation: nil, password_hash: "$2b$12$8yt6WNBt5hyxZE1MqiZtX.YRuReOuy4zom1imQvK2Q.Dw6pc8iNSG", reset_password_token: nil, sessions: #Ecto.Association.NotLoaded<association :sessions is not loaded>, updated_at: ~N[2017-04-15 14:58:48.268564]}

action:   show

resource: nil

        (my_app) lib/abilities.ex:43: Canada.Can.MyApp.User.can?/3
        (canary) lib/canary/plugs.ex:214: Canary.Plugs.do_authorize_resource/2
        (canary) lib/canary/plugs.ex:187: Canary.Plugs.authorize_resource/2
        (canary) lib/canary/plugs.ex:274: Canary.Plugs.do_load_and_authorize_resource/2
        (my_app) web/controllers/v1/operation_controller.ex:1: MyApp.V1.OperationController.phoenix_controller_pipeline/2
        (my_app) lib/my_app/endpoint.ex:1: MyApp.Endpoint.instrument/4
        (my_app) lib/phoenix/router.ex:261: MyApp.Router.dispatch/2
        (my_app) web/router.ex:1: MyApp.Router.do_call/2
        (my_app) lib/my_app/endpoint.ex:1: MyApp.Endpoint.phoenix_pipeline/1
        (my_app) lib/plug/debugger.ex:123: MyApp.Endpoint."call (overridable 3)"/2
        (my_app) lib/my_app/endpoint.ex:1: MyApp.Endpoint.call/2
        (plug) lib/plug/adapters/cowboy/handler.ex:15: Plug.Adapters.Cowboy.Handler.upgrade/4
        (cowboy) /home/mars/phoenix_projects/my_app/deps/cowboy/src/cowboy_protocol.erl:442: :cowboy_protocol.execute/4