使用nodejs访问添加到mongoDb模型的动态属性

Question

我有一个用户费用模型，它已经有了一些所需的费用，并且可以选择添加更多的费用，我可以通过动态属性添加到moongodb模型中，通过在模型中设置true的严格标志来处理这些费用。动态属性被成功地添加并保存到mongodb中，.I也将它们取回，但当我在javascript中访问它时，它给出未定义。我已经花了几个小时，但仍然一无所知。模型架构如下。

const {
  TRANSPORT,
  FOOD,
  PHONEBILL,
  UTILITIES,
  MISC,
  MONTHLY,
  WEEKLY,
  RENT,
} = require("../constants");
const semesterPlanSchema = new mongoose.Schema(
  {
    expense: {
      [RENT]: {
        amount: Number,
        duration: {
          type: String,
          enum: [WEEKLY, MONTHLY],
        },
      },
      [FOOD]: {
        amount: Number,
        duration: {
          type: String,
          enum: [WEEKLY, MONTHLY],
        },
      },
      [TRANSPORT]: {
        amount: Number,
        duration: {
          type: String,
          enum: [WEEKLY, MONTHLY],
        },
      },
      [PHONEBILL]: {
        amount: Number,
        duration: {
          type: String,
          enum: [WEEKLY, MONTHLY],
        },
      },
      [UTILITIES]: {
        amount: Number,
        duration: {
          type: String,
          enum: [WEEKLY, MONTHLY],
        },
      },
      [MISC]: {
        amount: Number,
        duration: {
          type: String,
          enum: [WEEKLY, MONTHLY],
        },
      },
    },
    month: {
      type: Number,
      enum: [1, 2, 3, 4, 5],
    },
    user_id: {
      type: mongoose.Schema.Types.ObjectId,
      ref: "user",
    },
    // will be used in emergency fund request
    // to check which plan month is currently active(1-5)
    isActive: {
      type: Boolean,
      default: false,
    },
    expired: {
      type: Boolean,
      default: false,
    },
    grand_total: {
      type: Number,
    },
    start_date: {
      type: String,
    },
  },
  {
    timestamps: true,
    strict: false,
  }
);

module.exports = mongoose.model("semesterplan", semesterPlanSchema);```

Answer 1

要读取在strict:false的帮助下添加的属性，应该在文档上使用get([path])方法。

假设您的文档被读取并存储到变量semesterPlan中。并且新动态属性的名称是例如otherExpenses，那么要读取属性值，您应该使用semesterPlan.get("otherExpenses")