node.js - Mongoose 错误 : Cast to embedded failed for value

Question

我正在创建一个 mongoose Schema，但我得到了一个 MongooseError。

这是我的方案:

let RestaurantSchema = new Schema({
    ratings: {
        type: [{
            id: Number,
            value: Number,
            _id: false
        }],
        default: [
            { id: 1, value: 0 },
            { id: 2, value: 0 },
            { id: 3, value: 0 },
            { id: 4, value: 0 },
            { id: 5, value: 0 }
        ]
    },
    menu: [{
        ratings: {
            type: [{
                id: Number,
                value: Number,
                _id: false
            }],
            default: [
                { id: 1, value: 0 },
                { id: 2, value: 0 },
                { id: 3, value: 0 },
                { id: 4, value: 0 },
                { id: 5, value: 0 }
            ]
        }
    }]
})

这是我得到的错误:

/var/app/node_modules/mongoose/lib/schema/documentarray.js:322
             throw new CastError('embedded', valueInErrorMessage,
             ^
 MongooseError: Cast to embedded failed for value "{ id: 5, value: 0 }" at path "rating"
     at CastError (/var/app/node_modules/mongoose/lib/error/cast.js:26:11)
     at DocumentArray.cast (/var/app/node_modules/mongoose/lib/schema/documentarray.js:322:19)
     at DocumentArray.SchemaType.getDefault (/var/app/node_modules/mongoose/lib/schematype.js:616:23)
     at EmbeddedDocument.Document.$__buildDoc (/var/app/node_modules/mongoose/lib/document.js:265:22)
     at EmbeddedDocument.Document (/var/app/node_modules/mongoose/lib/document.js:61:20)
     at EmbeddedDocument [as constructor] (/var/app/node_modules/mongoose/lib/types/embedded.js:31:12)
     at new EmbeddedDocument (/var/app/node_modules/mongoose/lib/schema/documentarray.js:70:17)
     at DocumentArray.SchemaArray [as constructor] (/var/app/node_modules/mongoose/lib/schema/array.js:67:21)
     at new DocumentArray (/var/app/node_modules/mongoose/lib/schema/documentarray.js:31:13)
     at Function.Schema.interpretAsType (/var/app/node_modules/mongoose/lib/schema.js:643:16)
     at Schema.path (/var/app/node_modules/mongoose/lib/schema.js:563:29)
     at Schema.add (/var/app/node_modules/mongoose/lib/schema.js:445:12)
     at new Schema (/var/app/node_modules/mongoose/lib/schema.js:99:10)
     at Object.<anonymous> (/var/app/models/restaurant.js:12:24)
     at Module._compile (module.js:571:32)
     at Object.Module._extensions..js (module.js:580:10)
     at Module.load (module.js:488:32)
     at tryModuleLoad (module.js:447:12)
     at Function.Module._load (module.js:439:3)
     at Module.require (module.js:498:17)
     at require (internal/module.js:20:19)
     at Object.<anonymous> (/var/app/controllers/restaurant.js:6:18)
     at Module._compile (module.js:571:32)
     at Object.Module._extensions..js (module.js:580:10)
     at Module.load (module.js:488:32)
     at tryModuleLoad (module.js:447:12)
     at Function.Module._load (module.js:439:3)
     at Module.require (module.js:498:17) 

我做错了什么？

Answer 1

不一定与上述情况有关，但出现此错误的情况(如发生在我身上的那样)是模式需要一个对象，但代码试图保存到一个数组。即，如果:

var MySubSchema = new Schema(
    {
        type: String,
        meta: String
    }
)

var MySchema = new Schema(
    subSchema: MySubSchema,
    otherSubSchema: OtherSubSchema 
)

但是保存数据的路由/ Controller 如下:

var mySchemaObj = new MySchema(
  {mySubSchema: [new MySubSchema(  //<-- Shouldn't have array "[" here
       {
          type: "foo",
          meta: "bar"
       }
    )]
  } 
)

. . . 
. . . 

mySchemaObj.save() . . . // <-- This will throw the "Cast to Embedded Failed" error, because MySchema expects a single MySubSchema Object, but the code above instantiates MySubSchema in an array.