查询附近还是内部

问题描述

使用MongoDB，我正在查询经纬度25英里以内的房屋.

Using MongoDB I'm querying homes that are within 25 miles of a lat/long.

我第一次尝试执行此操作是使用Near命令，如下所示:

My first attempt to do this used the near command, like so:

var near = Query.Near("Coordinates", coordinates.Latitude, coordinates.Longitude, find.GetRadiansAway(), false);
var query = Collection().Find(near);
var listings = query.ToList();

Near的问题是它仅返回100个列表，而我想返回距坐标25英里以内的所有列表.

The issue with near is that it only returns 100 listings, whereas I want to return all listings within 25 miles of the coordinates.

我的下一个尝试是在以下范围内使用

My next attempt was to use within:

var within = Query.WithinCircle("Coordinates", coordinates.Latitude, coordinates.Longitude, find.GetRadiansAway(), false);
var query = Collection().Find(within);
var listings = query.ToList();

Within返回25英里内的所有列表，这很好，但是并不会像Near那样根据它们与中心坐标的接近程度对它们进行排序.

Within returns all listings within 25 miles, which is great, however it doesn't sort them by how close they are to the center coordinates like near does.

所以我的问题是，我如何才能做到两全其美?如何获得25英里范围内的所有列表，并按照与中心坐标的接近程度对其进行排序?

So my question is, how do I get the best of both worlds? How do I get all listings within 25 miles AND have them sorted by proximity to the center coordinates?

推荐答案

地理空间$near查询设置的默认limit()为100个结果.通过设置新的limit()，您应该可以获得更多结果.

Geospatial $near queries set a default limit() of 100 results. You should be able to get more results by setting a new limit().

近"查询是按距离排序的，而内"则不是(尽管内"没有默认限制).

While "near" queries are sorted by distance, "within" is not (although "within" doesn't have a default limit).

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