[英]How to define a nested schema in mongoose?
我的mongo記錄是這樣的:
{
"_id":{"$oid":"5550b6de437f572112a29f1a"},
"cv_count":177732,
"gender_info": {"male_count": 50, "female_count": 32}
"stability_info_list":[{"ratio":8.802558610369414e-05,"total_count":34081,"years":0},{"ratio":5.868372406912943e-05,"total_count":34081,"years":1}],
"zhineng_id":"IT Manager"
}
我這樣寫模式:
var ZhinengGenderSchema = new Schema({
male_count: Number,
female_count: Number
});
var ZhinengStabilitySchema = new Schema({
ratio: Number,
total_count: Number,
years: Number
});
var ZhinengStats = new Schema({
cv_count: Number,
gender_info: ZhinengGenderSchema,
stability_info_list: [ZhinengStabilitySchema],
zhineng_id: String
})
但是我感到興奮:
TypeError: Undefined type `undefined` at `gender_info`
Did you try nesting Schemas? You can only nest using refs or arrays.
所以mongoose
不支持嵌套模式? 但是我的數據庫已經在那里,我無法更改,那么如何定義模式?
使用貓鼬,您可以在Array中定義嵌套(嵌入式)架構,如下所示:
var mongoose = require('mongoose'),
Schema = mongoose.Schema;
var bookSchema = new Schema({
value: { type: String }
});
var authorSchema = new Schema({
books: [bookSchema]
});
或參考
var mongoose = require('mongoose'),
Schema = mongoose.Schema,
ObjectId = mongoose.Schema.Types.ObjectId;
var auhtorSchema = new Schema({
book: { type: ObjectId, ref: 'Book'}
});
您可以選擇更適合您的
只是不要為子文檔創建新的架構,就可以了,即:
var ZhinengGenderSchema = {
male_count: Number,
female_count: Number
};
var ZhinengStabilitySchema = {
ratio: Number,
total_count: Number
years: Number
};
var ZhinengStats = new Schema({
cv_count: Number,
gender_info: ZhinengGenderSchema,
stability_info_list: [ZhinengStabilitySchema],
zhineng_id: String
})
據我所知,這是由於貓鼬的當前限制。 您不能聲明架構字段以包含單個子文檔:您必須使用數組。 看到這個: https : //github.com/Automattic/mongoose/pull/585
您可以稍后設置適當的業務邏輯,以確保僅添加一個子元素。
嘗試這個:
var ZhinengStats = new Schema({
cv_count: Number,
gender_info: [ZhinengGenderSchema],
stability_info_list: [ZhinengStabilitySchema],
zhineng_id: String
})
這樣,每個子文檔在MongoDB中都有自己的_id
(即使它不在特定的集合中)。 查看更多: http : //mongoosejs.com/docs/subdocs.html
您還可以喜歡這樣的東西:
var ZhinengStats = new Schema({
cv_count: Number,
gender_info: [{male_count: Number, female_count: Number}],
stability_info_list: [ZhinengStabilitySchema],
zhineng_id: String
})
在這種情況下,您將一個架構嵌套在另一個架構中。 單個gender_info
元素不具有文檔的尊嚴 。
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