我正在使用貓鼬作為 ODM 并嘗試為動物/寵物建模。在模型中，我有 2 個欄位，父母和庇護所。我想確保寵物屬于一個人或一個庇護所，但不能同時屬于兩者。什么限制可以讓我這樣做。
我在 JS 中的模型：-
const petSchema = mongoose.Schema({
name: {
type: String,
required: [true, "Pet must have a name."],
trim: true
},
species: {
type: String,
required: [true, "Pet must have a species."]
},
parent: {
type: mongoose.Schema.Types.ObjectId,
ref: 'User'
},
shelter: {
type: mongoose.Schema.Types.ObjectId,
ref: 'Shelter'
}
}
我是資料庫及其術語的新手，如果有任何錯誤，請糾正我。謝謝你。
uj5u.com熱心網友回復：
您可以使用所需的功能來確定這一點，如下所示：
const petSchema = mongoose.Schema({
name: {
type: String,
required: [true, "Pet must have a name."],
trim: true
},
species: {
type: String,
required: [true, "Pet must have a species."]
},
parent: {
type: mongoose.Schema.Types.ObjectId,
ref: 'User',
required: function() {
return !this.shelter;
}
},
shelter: {
type: mongoose.Schema.Types.ObjectId,
ref: 'Shelter',
required: function() {
return !this.parent;
}
}
}
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