如何为使用鉴别器的 mongoose Schema 上的字段编制索引？

Question

错误是在我开始使用鉴别器后出现的。

const mongoose = require("mongoose");
const Schema = mongoose.Schema;

const Base = require("../config/Base");

const Refill = Base.discriminator(
  "Refill",
  new Schema({
    cylinderSize: { type: Number, required: true },
    cylinderSwap: { type: Boolean, required: true },
    quantity: { type: Number, required: true },
    location: {
      type: { type: String },
      coordinates: [Number]
    }
  })
);

Refill.index({ location: "2dsphere" });


module.exports = mongoose.model("Refill");

这个returns错误Refill.index is not a function

Answer 1

我刚刚删除了 Refill.index({ location: "2dsphere" });，我的其余代码工作正常，显然不需要索引该字段。

Answer 2

在 Mongoose 中，必须在模式而非模型上创建索引。在您的例子中， Refill 对象是一个模型。一种方法是分三步实施：

创建架构
将索引添加到架构
创建模型

const mongoose = require("mongoose");
const Schema = mongoose.Schema;

const Base = require("../config/Base");

const refillSchema =
  new Schema({
    cylinderSize: { type: Number, required: true },
    cylinderSwap: { type: Boolean, required: true },
    quantity: { type: Number, required: true },
    location: {
      type: { type: String },
      coordinates: [Number]
    }
  });

refillSchema.index({ location: "2dsphere" });

const Refill = Base.discriminator("Refill", refillSchema);

module.exports = mongoose.model("Refill");

如何为使用鉴别器的 mongoose Schema 上的字段编制索引？

How do I index a field on a mongoose Schema that uses a discriminator?

mongodb

node.js

mongoose-schema