Mongoose：填充引用的子文档

Question

我有以下架构：

引用 CostCenter 子文档能力中的能力的事件。

const OccurrenceSchema = new mongoose.Schema({
  date: {
    type: Date,
    default: Date.now,
  },
  competence: {
    type: mongoose.Schema.Types.ObjectId,
    ref: 'CostCenter.competences',
  },
  ...
})

CostCenter，我有一个子文档数组，可以通过 Occurence 引用。

const CostCenterSchema = new mongoose.Schema({
  name: {
    type: String,
    required: true,
    trim: true,
  },
  competences: [CompetenceSchema],
});

最后是能力。

const CompetenceSchema = new mongoose.Schema({
  name: {
    type: String,
    required: true,
    trim: true,
  },
});

当我尝试填充权限时，我得到“架构尚未注册模型 \"CostCenter.competences\"。\n使用 mongoose.model(name, schema)”。

const occurrence_list = (request, response) => {
  Occurrence.find()
    .populate('occurrence origin tag entity method priority competence')
    .then(occurrences => response.send(occurrences))
    .catch(e => response.send(e));
};

在引用子文档时如何填充事件？

Answer 1

首先，您需要将您的 Occurrence 模型更改为此

const OccurrenceSchema = new mongoose.Schema({
   date: { type: Date, default: Date.now },
   competence: { type: mongoose.Schema.Types.ObjectId, ref:'CostCenter' }
});
mongoose.model('Occurrence', OccurrenceSchema);

和 CostCenter 模型：

const CostCenterSchema = new mongoose.Schema({
   name: { type: String, required: true, trim: true },
   competences:[{ type: mongoose.Schema.Types.ObjectId, ref: 'Competence' }],
});
mongoose.model('CostCenter', CostCenterSchema);

最终能力模型：

const CompetenceSchema = new mongoose.Schema({
   name: { type: String, required: true, trim: true }
});
mongoose.model('Competence', CompetenceSchema);

要从 Occurrence 填充权限，您可以这样做：

Occurrence.find({ your_query })
.populate('competence')
.then(occurrences => response.send(occurrences))
.catch(e => response.send(e));

希望对你有帮助！