MongoDB：蛞蝓未定义答案

【问题标题】：MongoDB: slug is undefinedMongoDB：蛞蝓未定义
【发布时间】：2022-11-09 17:08:31
【问题描述】：

每个模式都有自己的slug。 mongoose-slug-generator 为 schemaMain 生成 slug，但对于 schema1，slug 为 undefined。

无法理解为什么它未定义。

import mongoose from 'mongoose'
const { Schema } = mongoose
var slug = require("mongoose-slug-generator");
mongoose.plugin(slug);

const schema1 = new Schema({
    name: {
        type: String,
        required: true,
        trim: true,
        min: 1,
        max: 40,
    },
    slug: {
        type: String,
        lowercase: true,
        slug: ["name"],
        slug_padding_size: 4
    },
    description: {
        type: String,
        min: 1,
        max: 200,
        required: true,
        trim: true
    },
    video: {},
    music: []
}, { timestamps: true })


const schemaMain = new Schema({
    name: {
        type: String,
        required: true,
        trim: true,
        min: 1,
        max: 40,
    },
    slug: {
        type: String,
        lowercase: true,
        slug: ["name"],
        unique: true,
        slug_padding_size: 4
    },
    description: {
        type: String,
        min: 1,
        max: 200,
        required: true,
        trim: true
    },
    schemas: [schema1],
}, { timestamps: true })

export default mongoose.model('SomeModel', schemaMain)

【问题讨论】：

标签： node.js mongodb express mongoose

【解决方案1】：

而不是mongoose-slug-generator 使用mongoose-slug-updater

你所拥有的是嵌套模式，mongoose-slug-updater 也适用于此。

单独声明的嵌套模式示例

const SubChildSchema = new mongoose.Schema({
  title: { type: String },
  slug: { type: String, slug: 'title' },
  absoluteRootSlug: { type: String, slug: '/title' },
  absoluteChildSlug: { type: String, slug: '/child.title' },
  relativeParentSlug: { type: String, slug: ':title' },// child's title
  relativeGrandParentSlug: { type: String, slug: '::title' },//parent's title
});

const ChildSchema = new mongoose.Schema({
  title: { type: String },
  subChild: SubChildSchema,
  subChildren: [SubChildSchema],
  slug: { type: String, slug: 'title' },
  subChildSlug: { type: String, slug: 'subChild.title' },
  absoluteSlug: { type: String, slug: '/child.title' },
  absoluteRootSlug: { type: String, slug: '/title' },
  relativeParentSlug: { type: String, slug: ':title' },//Parent
  subChildrenSlug2: { type: String, slug: 'subChildren.2.title' },
  subChildrenSlug3: { type: String, slug: 'subChildren.3.title' },
});

const ParentSchema = new mongoose.Schema({
  title: { type: String },
  child: ChildSchema,
  children: [ChildSchema],
  slug: { type: String, slug: 'title' },
  absoluteSlug: { type: String, slug: '/title' },
  childSlug: { type: String, slug: 'child.title' },
  absoluteChildSlug: { type: String, slug: '/child.title' },
  subChildSlug: { type: String, slug: 'child.subChild.title' },
  childrenSlug0: { type: String, slug: 'children.0.title' },
  childrenSlug4: { type: String, slug: 'children.4.title' },
  subChildrenSlug3: { type: String, slug: 'children.7.subChildren.3.title' },
  subChildrenSlug7: { type: String, slug: 'children.3.subChildren.7.title' },
});

你可以阅读更多关于它的信息here

【讨论】：