英文:
Define a Mongoose Schema index (2dsphere) on an optional parameter
问题
我有一个用户模型，它可以分为两种类型：求职者和招聘者。
我想要求职者拥有一个地理位置字段，而招聘者不拥有，我必须将它们放在同一个模型中。
我的模型的一部分如下所示：
const schema = new mongoose.Schema(
{
type: {type: String},
name: {type: String},
geolocation: {
name: {type: String},
type: {type: String, default: 'Point'},
coordinates: {type: [Number]}
}
}
)
schema.index({ geolocation: '2dsphere' })
export default mongoose.model('User', schema)
我的问题是：
当我尝试创建一个“招聘者”时，我会收到一个错误消息，说Mongo无法将“geolocation”索引为2dsphere索引。我理解了这个问题。
我想要仅在“geolocation”字段不为空时才对其进行索引，这样我就可以创建招聘者而不保存其位置，并创建已保存其位置的求职者。
你能帮助我吗？ 
英文:
I have an user model, which can be of two types : postulant and recruiter.
I want the postulants to have a geolocation field, but not the recruiter, and I have to make them in a single Model.
There's a part of my model :
const schema = new mongoose.Schema(
{
type: {type: String},
name: {type: String},
geolocation: {
name: {type: String},
type: {type: String, default: 'Point'},
coordinates: {type: [Number]}
}
}
)
schema.index({ geolocation: '2dsphere' })
export default mongoose.model('User', schema)
My problem is :
When I try to create a 'recruiter', I have an error saying that Mongo failed to index 'geolocation' into a 2dsphere index. And I understand this problem.
I want to index geolocation only if it's not null, so I can create recruiter without saving their location, and create postulants with their location saved.
Can you help me?
答案1
得分: 0
我明白问题出在哪里：
我定义了：
geolocation: {
name: {type: String},
type: {type: String, default: 'Point'},
coordinates: {type: [Number]}
}
事实是，使用了 default: 'Point'，我创建了一个带有空数组的地理位置对象。
为了解决这个问题，我只需移除 default: 'Point'，对象就不会被创建，因此 schema.index 也不会运行。
英文:
I figure what the problem was :
I defined :
geolocation: {
name: {type: String},
type: {type: String, default: 'Point'},
coordinates: {type: [Number]}
}
The fact is that, with the default: 'Point', I had an geolocation object who was created, with an empty array.
To solve this, I just removed this default: 'Point' and the object is not created, so the schema.indexis not running.
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