Question

所以我是长生不老药，但我找不到有关此的信息，我真的不明白问题所在。

让我们说：

%Restaurant{} has many %Discount{}
%Discount{} has many %PromoCode{}

工厂：

def restaurant_factory do
  %Restaurant{ 
     discounts: [ 
        build(:discount)
     ] 
   }
end 

def discount_factory do
   %Discount{
        promo_codes: [
             build(:promo_code)
        ]
    }
 end 

def promo_code_factory do
     %PromoCode{}
end

但是当我跑步时：

test "" do
    r = insert(:restaurant)
end

我得到： **（ArgumentError）预期变更集数据为％Discount结构，得到：％PromoCode

所以我不能拥有“嵌套”版本？还是其他地方有问题？

实现我想要的东西的正确方法是什么：创建餐厅，创建与餐厅相关的折扣并创建与折扣相关的促销代码？

完整错误：

  1) test load discount by promo code (Restaurants.Domain.LoadDiscountsServiceTest)
     test/services/load_discounts/service_test.exs:42
     ** (ArgumentError) expected changeset data to be a Elixir.Restaurants.Domain.Models.Discount struct, got: %Res
taurants.Domain.Models.PromoCode{__meta__: #Ecto.Schema.Metadata<:built, "promo_codes">, code: "XXYY6Z", created_at
: nil, discounts: #Ecto.Association.NotLoaded<association :discounts is not loaded>, discounts_id: nil, id: nil, up
dated_at: nil, use_limit: 3}
     stacktrace:
       (ecto) lib/ecto/changeset/relation.ex:190: Ecto.Changeset.Relation.assert_changeset_struct!/2
       (ecto) lib/ecto/changeset/relation.ex:148: Ecto.Changeset.Relation.do_change/4
       (ecto) lib/ecto/changeset/relation.ex:312: Ecto.Changeset.Relation.map_changes/8
       (ecto) lib/ecto/repo/schema.ex:597: anonymous fn/4 in Ecto.Repo.Schema.surface_changes/3
       (elixir) lib/enum.ex:1925: Enum."-reduce/3-lists^foldl/2-0-"/3
       (ecto) lib/ecto/repo/schema.ex:584: Ecto.Repo.Schema.surface_changes/3
       (ecto) lib/ecto/repo/schema.ex:189: Ecto.Repo.Schema.do_insert/4
       (ecto) lib/ecto/association.ex:556: Ecto.Association.Has.on_repo_change/4
       (ecto) lib/ecto/association.ex:338: anonymous fn/7 in Ecto.Association.on_repo_change/6
       (elixir) lib/enum.ex:1925: Enum."-reduce/3-lists^foldl/2-0-"/3
       (ecto) lib/ecto/association.ex:335: Ecto.Association.on_repo_change/6
       (elixir) lib/enum.ex:1925: Enum."-reduce/3-lists^foldl/2-0-"/3
       (ecto) lib/ecto/association.ex:301: Ecto.Association.on_repo_change/3
       (ecto) lib/ecto/repo/schema.ex:708: Ecto.Repo.Schema.process_children/4
       (ecto) lib/ecto/repo/schema.ex:774: anonymous fn/3 in Ecto.Repo.Schema.wrap_in_transaction/6
       (ecto) lib/ecto/adapters/sql.ex:576: anonymous fn/3 in Ecto.Adapters.SQL.do_transaction/3
       (db_connection) lib/db_connection.ex:1283: DBConnection.transaction_run/4
       (db_connection) lib/db_connection.ex:1207: DBConnection.run_begin/3
       (db_connection) lib/db_connection.ex:798: DBConnection.transaction/3
       (ecto) lib/ecto/repo/schema.ex:125: Ecto.Repo.Schema.insert!/4

我通过以下方式运行测试：

iex -S mix test --trace test/services/load_discounts/service_test.exs:42

42是此特定测试开始的行

Answer 1

我的关联是错误的，我在％Discount中拥有

has_many(:promo_codes, Discount)

我应该有： has_many(:promo_codes, PromoCode)

令人尴尬！很抱歉！

ExMachina的“嵌套”构建

1 个答案: