2个字段唯一的猫鼬模式

我正在尝试将2个字段设置为彼此唯一，并且没有重复项。

代码是这里：

const Connection = mongoose.model("Connection", new mongoose.Schema({
    from_friend: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'Friend'
    },
    to_friend: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'Friend'
    }
}))
exports.Connection = Connection;

您可以使用包含两个字段的唯一索引来执行此操作

const ConnectionSchema = mongoose.Schema({
    from_friend: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'Friend'
    },
    to_friend: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'Friend'
    }
});

ConnectionSchema.index({ from_friend: 1, to_friend: 1 }, { unique: true });
module.exports = mongoose.model('Connection', ConnectionSchema);

2个字段唯一的猫鼬模式

我正在尝试将2个字段设置为彼此唯一，并且没有重复项。

代码是这里：

const Connection = mongoose.model("Connection", new mongoose.Schema({
    from_friend: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'Friend'
    },
    to_friend: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'Friend'
    }
}))
exports.Connection = Connection;

您可以使用包含两个字段的唯一索引来执行此操作

const ConnectionSchema = mongoose.Schema({
    from_friend: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'Friend'
    },
    to_friend: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'Friend'
    }
});

ConnectionSchema.index({ from_friend: 1, to_friend: 1 }, { unique: true });
module.exports = mongoose.model('Connection', ConnectionSchema);