问题描述
我正在尝试在MongoMapper支持的模型中用maxDistance封装一个Near查询.
I'm trying to encapsulate a near query with a maxDistance in a MongoMapper backed model.
我的查询语法一定很愚蠢.
I must be doing something silly in my query syntax.
型号
class Site
include MongoMapper::Document
key :id, Integer
key :name, String
key :location, Array
ensure_index [[:location, '2d']]
def self.nearest(center_point, range)
where(:location => {'$near' => center_point, '$maxDistance' => range}).all
end
end
试图在距离点200英里范围内获得一切...
Trying to get everything within 200 miles of a point...
> Mongo::OperationFailure: geo values have to be numbers: {
> $maxDistance: 200, $near: [ -122.0, 44.0 ] } from
> /Library/Ruby/Gems/1.8/gems/mongo-1.6.1/lib/mongo/cursor.rb:144:in
> `next' from
> /Library/Ruby/Gems/1.8/gems/mongo-1.6.1/lib/mongo/cursor.rb:290:in
> `each' from
> /Library/Ruby/Gems/1.8/gems/mongo-1.6.1/lib/mongo/cursor.rb:308:in
> `to_a' from
> /Library/Ruby/Gems/1.8/gems/mongo-1.6.1/lib/mongo/cursor.rb:308:in
> `to_a' from
> /Library/Ruby/Gems/1.8/gems/plucky-0.4.4/lib/plucky/query.rb:74:in
> `all' from /Users/nick/Code/web/map/app/models/site.rb:40:in
> `nearest' from (irb):
推荐答案
我猜测这实际上是数据问题或索引问题,您的查询看起来正确.
I'm guessing it's actually a data problem or index problem, your query looks correct.
请参见 http://www.mongodb.org/display/DOCS/Geospatial+Indexing ... MaxDistance 200可能太大:
See http://www.mongodb.org/display/DOCS/Geospatial+Indexing ... MaxDistance of 200 may be too large:
距离单位与坐标系中的单位相同.
The distance unit is the same as in your coordinate system.
也请尝试Site.distinct(:location)
并查找任何非数字数据. (如果您未使用MM 0.11.1,则为Site.query.distinct(:location)
.
Also try Site.distinct(:location)
and look for any non-numeric data. (or Site.query.distinct(:location)
if you're not on MM 0.11.1).
提示:如果要查看查询命中MongoDB后的外观,请添加.criteria.to_hash
:
Hint: If you want to see what a query is going to look like when it hits MongoDB, add .criteria.to_hash
:
Site.where(:location => {'$near' => center_point, '$maxDistance' => range}).criteria.to_hash
# =>
{
:location=> {
"$near" => [-122.0, 44.0],
"$maxDistance" => 200
}
}
这篇关于MongoMapper靠近maxDistance-Mongo :: OperationFailure:地理位置值必须是数字:的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!