0

"Cannot read property 'get' of undefined"仅当我将对象product数组添加到突变时才出现错误，如果我只添加orderIdInt 则没有错误。以下是更多信息：

架构

type Order {
    orderId: Int
    product: [ProductInput]
}

input ProductInput {
    prodId: String
    value: [ValueInput]
}

type Product {
    prodId: String
    value: [Value]
}

type Value{
    name:String,
    props:String
}

input ValueInput{
    name:String,
    props:String
}

突变

 addOrder(orderId: Int, product: [ProductInput]):Order

解析器（带猫鼬）

 addOrder(parent, args, context, info) {
 let orderId;
 let product;

 if (args.orderId) {
      orderId = { orderId: args.orderId };
      }
 if (args.product) {
      product= { product: args.product};
      }

return context.Order.findOneAndUpdate(
      { orderId: args.orderId },
      {
        $setOnInsert: {
          ...orderId,
          ...product
        }
      },
      { new: true, upsert: true }
    );
}

即使我得到错误，突变在数据库中成功，但graphql返回

{
  "errors": [
    {
      "message": "Cannot read property 'get' of undefined",
      "locations": [
        {
          "line": 2,
          "column": 3
        }
      ],
      "path": [
        "addOrder"
      ],
      "extensions": {
        "code": "INTERNAL_SERVER_ERROR",
        "exception": {
          "stacktrace": [
            "TypeError: Cannot read property 'get' of undefined",
            "    at EmbeddedDocument.<anonymous> (C:\\Users\\mihai\\Desktop\\Projects\\ECOM\\BACKEND\\node_modules\\mongoose\\lib\\schema.js:1824:23)",
            "    at VirtualType.applyGetters (C:\\Users\\mihai\\Desktop\\Projects\\ECOM\\BACKEND\\node_modules\\mongoose\\lib\\virtualtype.js:137:25)",
            "    at EmbeddedDocument.Document.get (C:\\Users\\mihai\\Desktop\\Projects\\ECOM\\BACKEND\\node_modules\\mongoose\\lib\\document.js:1508:19)",
            "    at applyVirtuals (C:\\Users\\mihai\\Desktop\\Projects\\ECOM\\BACKEND\\node_modules\\mongoose\\lib\\document.js:3246:20)",
            "    at EmbeddedDocument.Document.$toObject (C:\\Users\\mihai\\Desktop\\Projects\\ECOM\\BACKEND\\node_modules\\mongoose\\lib\\document.js:2986:5)",
            "    at EmbeddedDocument.Document.toObject (C:\\Users\\mihai\\Desktop\\Projects\\ECOM\\BACKEND\\node_modules\\mongoose\\lib\\document.js:3169:15)",
            "    at DocumentArrayPath.cast (C:\\Users\\mihai\\Desktop\\Projects\\ECOM\\BACKEND\\node_modules\\mongoose\\lib\\schema\\documentarray.js:401:27)",
            "    at DocumentArrayPath.SchemaType.applySetters (C:\\Users\\mihai\\Desktop\\Projects\\ECOM\\BACKEND\\node_modules\\mongoose\\lib\\schematype.js:1010:12)",
            "    at DocumentArrayPath.SchemaType._castForQuery (C:\\Users\\mihai\\Desktop\\Projects\\ECOM\\BACKEND\\node_modules\\mongoose\\lib\\schematype.js:1424:15)",
            "    at DocumentArrayPath.SchemaType.castForQueryWrapper (C:\\Users\\mihai\\Desktop\\Projects\\ECOM\\BACKEND\\node_modules\\mongoose\\lib\\schematype.js:1391:17)",
            "    at castUpdateVal (C:\\Users\\mihai\\Desktop\\Projects\\ECOM\\BACKEND\\node_modules\\mongoose\\lib\\helpers\\query\\castUpdate.js:515:19)",
            "    at walkUpdatePath (C:\\Users\\mihai\\Desktop\\Projects\\ECOM\\BACKEND\\node_modules\\mongoose\\lib\\helpers\\query\\castUpdate.js:342:22)",
            "    at castUpdate (C:\\Users\\mihai\\Desktop\\Projects\\ECOM\\BACKEND\\node_modules\\mongoose\\lib\\helpers\\query\\castUpdate.js:99:18)",
            "    at model.Query._castUpdate (C:\\Users\\mihai\\Desktop\\Projects\\ECOM\\BACKEND\\node_modules\\mongoose\\lib\\query.js:4481:10)",
            "    at castDoc (C:\\Users\\mihai\\Desktop\\Projects\\ECOM\\BACKEND\\node_modules\\mongoose\\lib\\query.js:4509:18)",
            "    at model.Query.Query._findAndModify (C:\\Users\\mihai\\Desktop\\Projects\\ECOM\\BACKEND\\node_modules\\mongoose\\lib\\query.js:3472:22)"
          ]
        }
      }
    }
  ],
  "data": {
    "addOrder": null
  }
}
4

2 回答 2

1

第一的

突变

 addOrder(orderId: Int, product: [ProductInput]):Order

变异addOrder应该返回Order对象

findOneAndUpdate方法插入一条新记录，但返回结果是可选的 - 可以使用 returnNewDocument: true（默认：）来完成false- 请参阅文档

第二

如果您要插入嵌套/嵌入实体 - ProductInput 数组 - 您也需要插入/创建它们 - 请参阅稍微相关的问题 - 当然它取决于猫鼬模式（您没有提供）。

让 mongoose 部分工作并使用 graphql 解析器“包装”比调整/更改 mongoose 模式以反映 grpahql 类型/解析器更改更容易。

于 2020-03-09T09:54:52.407 回答
0

感谢@xadm，我通过在解析器中替换解决了错误：

 if (args.product) {
      product= { product: args.product};
      }

和

if (args.product) {
      product = args.product.map((product) => {
        return {
          'product.prodId': product.prodId,
          'product.variation': product.variation.map((variation) => {
            return {
              'product.variation.name': variation.name,
              'product.variation.value': variation.value
            };
          })
        };
      });
    }
于 2020-03-09T11:10:13.423 回答