当我使用 slugify mongoose 更改名称时，如何自动更新 slug？

Question

产品的slug是在我发布产品时创建的。但是当我更改产品名称时，slug 没有更新。

这是我的代码：

const mongoose = require('mongoose');
const { default: slugify } = require('slugify');

const ProductSchema = new mongoose.Schema(
  {
    name: {
      type: String,
      trim: true,
      unique: true,
      required: [true, 'Please add product name'],
    },
    slug: String,

    sku: {
      type: String,
      trim: true,
      required: [true, 'Please add product sku'],
    },

    isActive: {
      type: Boolean,
      default: true,
    },
    createdAt: {
      type: Date,
      default: Date.now,
    },
    updatedAt: {
      type: Date,
      default: Date.now,
    },
  },
  {
    toJSON: { virtuals: true },
    toObject: { virtuals: true },
  }
);

ProductSchema.pre('save', function (next) {
  this.slug = slugify(this.name, { lower: true });
  next();
});

module.exports = mongoose.model('Prduct', ProductSchema );

我想在更改名称时自动更新slug

Answer 1

您可以使用 virtuals 来实现此目的。删除架构上的属性并使用它：

ProductSchema.virtual('slug').get(function() {
  return slugify(this.name, { lower: true });
});

该属性实际上并不存在于数据库中，并将根据当前名称动态确定。

Answer 2

使用

slugify

模块和 `mongoose.pre('save')` 中间件的另一个解决方法是：

例如

// someModel.js

const mongoose = require('mongoose');
const slug = require('slugify');

const ProductSchema = new mongoose.Schema(
  {
    name: {
      type: String,
      trim: true,
      unique: true,
      required: [true, 'Please add product name'],
    },
    slug: String,

    sku: {
      type: String,
      trim: true,
      required: [true, 'Please add product sku'],
    },

    isActive: {
      type: Boolean,
      default: true,
    },
    createdAt: {
      type: Date,
      default: Date.now,
    },
    updatedAt: {
      type: Date,
      default: Date.now,
    },
  },
  {
    toJSON: { virtuals: true },
    toObject: { virtuals: true },
  }
);

ProductSchema.pre('save', async function (next) {
  const product = this

  if (!product.isModified('name')) return next()

  const slug = slugify(product.name, { lower: true, trim: true })

  product.slug = slug

  return next()
});

module.exports = mongoose.model('Prduct', ProductSchema );

// someController.js

const updateProduct = async (req, res) => {
      const { productId } = req.params
    
      const { name, ... } = req.body
    
    // const product = await Product.findOneAndUpdate(filter, update, { new: true }) not working instead:
    
    let product = await Product.findById(productId)

    product?.name = name
    ...

    await product.save()
    
    return product
}

编码快乐！