在集合中插入2个文档,坐标为
查找坐标
我无法使用mongoose的qry.where().near()
语法查询mongodb数据库。
我有一个坐标存储为数组的Schema,索引为2dsphere
:
loc : { type: [Number], index: '2dsphere' }
我正在使用.where().near()
运行猫鼬查询:
qry.where('loc').near({
center: search.loc,
maxDistance: search.distance * 1000
});
我已经启用了mongoose.set('debug', true)
,并且可以看到结果调试:
在集合中插入2个文档,坐标为[ 10, -20 ]
:
Mongoose: models.insert({ _id: ..., loc: [ 10, -20 ], type: 'apple' }) {}
Mongoose: models.insert({ _id: ..., loc: [ 10, -20 ], type: 'orange' }) {}
查找坐标[ 10, -20 ]
附近的文档:
Mongoose: models.find({ loc: { '$near': [ 10, -20 ], '$maxDistance': 1000 } })
查询返回没有结果。
我已经通过在type
上搜索证明了这些文档在数据库中。这是地理空间查询,我无法工作。
我使用mongodb v2.6.1
和mongoose v3.8.8
完整的工作示例如下:
模式:(model.js)
var mongoose = require('mongoose'),
Schema = mongoose.Schema;
var ModelSchema = new Schema({
type : { type: String, index: true },
loc : { type: [Number], index: '2dsphere' }
});
ModelSchema.index({type: 1, loc: 1});
ModelSchema.statics.search = function(search, cb) {
var qry = this.find();
if (search.types) {
qry.where('type').in(search.types);
}
if (search.loc) {
qry.where('loc').near({
center: search.loc,
maxDistance: search.distance * 1000
});
}
qry.exec(cb);
};
摩卡测试:(test.ts)
var q = require('node-promise'),
should = require('should'),
mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/my-test');
var Model = require('./model');
describe('My Model', function() {
before(function(done) {
mongoose.set('debug', true);
Model.remove().exec(function() {
var create = function(promises, body) {
var p = new q.Promise();
var m = new Model(body);
m.save(function(err) {
if (err) {
console.log(err);
p.reject();
} else {
p.resolve();
}
});
promises.push(p);
};
var promises = [];
create(promises, { type: 'apple', loc: [ 10, -20 ] });
create(promises, { type: 'orange', loc: [ 10, -20 ] });
create(promises, { type: 'apple', loc: [ 15, 10 ] });
create(promises, { type: 'orange', loc: [ 15, 10 ] });
q.all(promises).then(function() {
done();
})
});
});
it('should find all', function(done) {
Model.search({}, function(err, items) {
items.should.have.length(4);
done();
});
});
it('should find apples', function(done) {
Model.search({types: ['apple']}, function(err, items) {
items.should.have.length(2);
done();
});
});
// this test fails
it('should find coords', function(done) {
Model.search({loc: [ 10, -20 ], distance: 1}, function(err, items) {
items.should.have.length(2);
done();
});
});
});
package.json:
{
"name": "test",
"version": "0.0.0",
"dependencies": {
"mongoose": "~3.8.8"
},
"devDependencies": {
"should": "~2.1.0",
"node-promise": "0.5.10"
}
}
摩卡:
sudo npm install -g mocha
npm install
mocha ./test.js
似乎这是一个月鹅bug
将查询更改为使用GeoJSON
对象代替坐标对,如下:
qry.where('loc').near({
center: {
type: 'Point',
coordinates: search.loc
},
maxDistance: search.distance * 1000
});
导致以下查询:
Mongoose: models.find({ loc: { '$near': {
'$maxDistance': 1,
'$geometry': { type: 'Point', coordinates: [ 10, -20 ] } } }
}) { fields: undefined }
搜索成功
文档使用坐标对显式显示查询:
query.where('loc').near({ center: [10, 10], maxDistance: 5 });
然而,看起来这不起作用,示例应该是:
query.where('loc').near({ center: { coordinates: [10, 10], type: 'Point' }, maxDistance: 5 });