node.js - `mongoose-lean-getters` 无法与 `find` 正常工作，调用 getter 方法两次

Question

我正在使用lean ，(这使得查询更快，内存占用更少，但结果文档是普通的旧 JavaScript 对象(PO​​JO)，)

默认情况下，这将阻止所有 getter 执行并提供 POJO(普通旧 java 对象)，因此我们可以使用 mongoose-lean-getters 作为解决方案。根据 standard doc

架构:

const mongooseLeanGetters = require('mongoose-lean-getters');
const rateSchema = new Schema({
    rate_photo: {
        type: String,
        get: getFullUrl
    }
);

rateSchema.plugin(mongooseLeanGetters);

const Rate = mongoose.model('rates', rateSchema);

module.exports = Rate;

function getFullUrl(url) {
    if (url != undefined) return `${process.env.ASSETS_URL}uploads/${url}`;
    else return '';
}

问题:

model.Rate.find(condition).lean({ getters : true })

输出:

without getter :
"rate_photo": "rate/1574154457920-myw3schoolsimage.jpg",

With getter :
"rate_photo": "http://192.168.15.93:6600/assets/uploads/rate/1574154457920-myw3schoolsimage.jpg",

With lean:
"rate_photo": "rate/1574154457920-myw3schoolsimage.jpg",

With lean and findOne:
"rate_photo": "http://192.168.15.93:6600/assets/uploads/rate/1574154457920-myw3schoolsimage.jpg",

With lean and find: // <------------ ISSUE
expected result : 
    "rate_photo": "http://192.168.15.93:6600/assets/uploads/rate/1574154457920-myw3schoolsimage.jpg",
BUT GOT THIS :
    "rate_photo": "http://192.168.15.93:6600/assets/uploads/http://192.168.15.93:6600/assets/uploads/rate/1574154457920-myw3schoolsimage.jpg",

<小时/>

我还发现了问题背后的原因，在npm包中，他们通过中间件调用getter两次第一次来自pre并且来自post的第二个，这仅适用于find方法:

module.exports = function mongooseLeanGetters(schema) {
  const fn = applyGettersMiddleware(schema);
  schema.pre('find', function() { //<--------------- 1st HERE
    if (typeof this.map === 'function') {
      this.map((res) => {
        fn.call(this, res);
        return res;
      });
    } else {
      this.options.transform = (res) => {
        fn.call(this, res);
        return res;
      };
    }
  });

  schema.post('find', fn); //<--------------- 2nd HERE
  schema.post('findOne', fn);
  schema.post('findOneAndUpdate', fn);
};

<小时/>

所以，如果我注释掉其中一个，那么效果很好，但是代码由于某种原因而存在，那么有没有更好的方法可以继续？

Answer 1

该问题已在版本中解决: 0.1.2

我认为他们已经删除了这个来解决问题:

schema.post('find', fn); //<--------------- 2nd HERE

Github 上提出的问题:https://github.com/mongoosejs/mongoose-lean-getters/issues/1