在猫鼬模式上应用2dsphere索引是否会强制需要location字段?

问题描述

我的猫鼬模式和模型定义如下:

var mongoose = require('mongoose')
  , Schema = new mongoose.Schema({
      email: {
        index: {
          sparse: true,
          unique: true
        },
        lowercase: true,
        required: true,
        trim: true,
        type: String
      },
      location: {
        index: '2dsphere',
        type: [Number]
      }
    })
  , User = module.exports = mongoose.model('User', Schema);

如果我尝试:

var user = new User({ email: '[e-mail]' });

user.save(function(err) {
  if (err) return done(err);

  should.not.exist(err);
  done();
});

我收到错误消息:

MongoError: Can't extract geo keys from object, malformed geometry?:{}

尽管此模式中的位置字段不是必需的，但无论如何似乎仍在起作用.我尝试添加确实避免了此错误的default: [0,0]，但是似乎有点hack，因为这显然不是一个很好的默认值，理想情况下，该架构不需要用户始终有位置. /p>

使用MongoDB/mongoose进行地理空间索引是否暗示需要建立索引的字段?

解决方案

默认情况下，声明为数组的属性会接收默认的空数组以供使用. MongoDB已经开始验证geojson字段，并大喊空数组.解决方法是在架构中添加预保存钩子，以检查这种情况并首先修复文档.

schema.pre('save', function (next) {
  if (this.isNew && Array.isArray(this.location) && 0 === this.location.length) {
    this.location = undefined;
  }
  next();
})

I have a mongoose schema and model defined as follows:

var mongoose = require('mongoose')
  , Schema = new mongoose.Schema({
      email: {
        index: {
          sparse: true,
          unique: true
        },
        lowercase: true,
        required: true,
        trim: true,
        type: String
      },
      location: {
        index: '2dsphere',
        type: [Number]
      }
    })
  , User = module.exports = mongoose.model('User', Schema);

If I attempt:

var user = new User({ email: '[e-mail]' });

user.save(function(err) {
  if (err) return done(err);

  should.not.exist(err);
  done();
});

I receive the error message:

MongoError: Can't extract geo keys from object, malformed geometry?:{}

Despite the location field in this schema not being required, it seems to be acting as such anyways. I have tried adding default: [0,0] which does circumvent this error, however it seems like a bit of a hack, as this is clearly not a good default, and ideally the schema would not require the user to have a location at all times.

Do geospatial indexes with MongoDB / mongoose imply that the field being indexed is required?

解决方案

By default, a property declared an array receives a default empty array to work with. MongoDB has started validating geojson fields and yells about empty arrays. The work around is to add a pre save hook to the schema that checks for this scenario and fixes up the document first.

schema.pre('save', function (next) {
  if (this.isNew && Array.isArray(this.location) && 0 === this.location.length) {
    this.location = undefined;
  }
  next();
})

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