Question

我的mongoDB中有一个复杂的架构

var bookSchema = mongoose.Schema({
    _creator: { type: mongoose.Schema.Types.ObjectId, ref: 'User' },
    content: {
        page: [
            {
                img: String,
                frame: [
                    {
                        cx: Number,
                        cy: Number,
                        scale: Number,
                        rotation: Number,
                        cropping: {
                            x: [Number],
                            y: [Number],
                            visible: Boolean,
                            color: String,
                            shape: String
                        },
                        transition: {
                            easing: String,
                            time: Number,
                            type: String
                        },
                        requireUserInput: Boolean
                    }
                ]
            }
        ]
    },
    views: Number,
    name: String,
    genre: String,
    Description: String,
    hasBecomicsMode: Boolean,
    dateOfCreation: Date,
    published: Boolean
})

渲染时，会向每个字段添加一个_id，如下所示：

book = {
    _creator: "some user ID",
    content: {
        page: [
            {
                _id : "an ID is automatically added",
                img: "a path",
                frame: [
                    {
                        _id: "an ID is automatically added",
                        cx: Number,
                        cy: Number,
                    //etc...
                    }
                ]
            }
        ]
    },
//etc...
}

这使得无法复制字段“content”，因为_ids发生了冲突。

有没有办法制作这样的东西：

newBook = existingBook.removeIDs() //kinda thing...

Answer 1

定义嵌入式架构时，可以将选项指定为第二个参数，您可以在其中阻止文档获取Mongoose创建的_id（父文档在MongoDB时仍会创建_id插入）。因此，您可以按以下方式定义模式：

var frameSchema = new Schema(
    {
        cx: Number,
        cy: Number,
        scale: Number,
        rotation: Number,
        cropping: {
            x: [Number],
            y: [Number],
            visible: Boolean,
            color: String,
            shape: String
        },
        transition: {
            easing: String,
            time: Number,
            type: String
        },
        requireUserInput: Boolean
    },
    { _id: false }
);

var pageSchema = new Schema(
    {
        img: String,
        frame: [frameSchema]
    },
    { _id: false }
);

var bookSchema = mongoose.Schema({
    _creator: { type: mongoose.Schema.Types.ObjectId, ref: 'User' },
    content: {
        page: [pageSchema]
    },
    views: Number,
    name: String,
    genre: String,
    Description: String,
    hasBecomicsMode: Boolean,
    dateOfCreation: Date,
    published: Boolean
})

有关详细信息，请参阅 documentation 。

复制复杂的mongoDB文档而不复制_id

1 个答案: