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POMongoDB $near query using Java driver
 

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    <p>I have some shops with products on them in my MongoDB db following this data model: Shop { idShop, name, location {lat, lon}, products [] of int } If I run the following command in the mongoDB default console:</p> <blockquote> <p>db.shops.find({products:1, location:{$near:[41.391204,2.145381]}}).limit(300)</p> </blockquote> <p>to find the shops that have product nº 1 ordered by distance I get the following results:</p> <blockquote> <p>{ "_id" : ObjectId("4f410cefe4b03a0e3cff6f5a"), "name" : "Shop1", "location" : { "lat" : 41.389915, "lon" : 2.135628 }, "products" : [ 1, 5, 4 ] }</p> <p>{ "_id" : ObjectId("4f410cefe4b03a0e3cff6f59"), "name" : "Shop2 Center", "location" : { "lat" : 41.388191, "lon" : 2.128816 }, "products" : [ 1, 2, 3 ] }</p> <p>{ "_id" : ObjectId("4f410cefe4b03a0e3cff6f5c"), "name" : "Shop3", "location" : { "lat" : 41.384712, "lon" : 2.172031 }, "products" : [ 6, 1 ] }</p> <p>{ "_id" : ObjectId("4f410cefe4b03a0e3cff6f5d"), "name" : "Shop4", "location" : { "lat" : 41.384029, "lon" : 2.173936 }, "products" : [ 6, 1, 2, 3, 4, 5 ] }</p> </blockquote> <p>Now, I want the same results but using my java servlet. If I search by only product number, the results are OK but not sorted. Then, if I try to sort them by adding a new key/value condition it doesn't return nothing. The code I'm using is the following:</p> <blockquote> <p>BasicDBObject query = new BasicDBObject();</p> <p>query.put("products", Integer.parseInt(idProduct));</p> <p>QueryBuilder query2 = new QueryBuilder();</p> <p>query2.near(Double.parseDouble(lat), Double.parseDouble(lon));</p> <p>query.putAll(query2.get());</p> <p>curShops = collShops.find(query);</p> </blockquote> <p>This returns an empty JSON. I've also tryed other ways like:</p> <blockquote> <p>BasicDBObject query = new BasicDBObject();</p> <p>query.put("products", Integer.parseInt(idProduct));</p> <p>ArrayList ar = new ArrayList(2);</p> <p>ar.add(Double.parseDouble(lat));</p> <p>ar.add(Double.parseDouble(lon));</p> <p>query.put("location", new BasicDBObject("$near", ar));</p> <p>curShops = collShops.find(query);</p> </blockquote> <p>Without any luck.</p> <p>Can anyone help me with this?</p> <p>Thanks in advance.</p>
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