フェニックスカナリーnot_foundハンドラー

Question

私はフェニックスのアプリでcanary libを使用しています。

私はconfig.exsに書いた：

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

と作成したヘルパー：

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 

私abilities.ex：

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 

そしてunauthorized_handler正常に動作します。しかし、not_found_handlerは動作しません。

[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. 

私はabilities.exにこの機能を追加した場合：

def can?(user, action, nil) do 
    IO.puts "check ability for nil" 
    false 
    end 

リソースが見つからない場合は、私が唯一

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

のままにした場合、私はhandle_unauthorized

呼び出されます

次にエラーが発生します

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

私は

UPDこの場合のための機能を記述する必要がどのように理解していない：完全なエラーメッセージ：

[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 

Answer 1

あなたはcan?(_, _, nil)機能の句にtrueを返した場合は、これができるようになります渡す許可とhandle_not_foundプラグを使ってconnを正しく設定してください。