Hi Jenny,
yes, it's tricky, getting all pieces together to have a working database
with spatial. But it can be done.
Question is, do you want to create the app by coding everything from the
ground up (which is fun, and you learn a lot about spatial/Neo4j), or do
you want to get a working web/mobile app as quick as possible? If option
one, I and the Neo4j community can help you by answering your questions.
If option two, you might have a look at our framework Structr
(http://structr.org, https://github.com/structr/structr). It has a
built-in distance search based on Neo4j Spatial, and we can support you
creating a web app, or a RESTful backend for mobile apps (or both).
BTW, in which language do plan to code your app?
Cheers,
Axel
Am 31.03.2014 22:06, schrieb Jenny Pettersson:
Hi!
Trying to build a social network app with Neo4j 2.0 but unfortunately
the spatial plugin is giving me a hard time. It's difficult to find
documentation/samples and my trial and error approach is rather
frustrating and time consuming so I would really appreciate
clarification to a couple of questions a lot!
A short simplified description of my domain is that I have Places and
Users which both have the properties lat and lon. I have managed to
add a simple point layer and a spatial index geom to my db. Then I
have created user and place nodes and added them to the index and
after that to the point layer. Using the web interface the nodes and
relationships look correct but I am having problems quering and
updating the data:
1. My most common use case is that I want to return nearby users and
places from a users given position. Using cypher and the
withinDistance query START n=node:geom('withinDistance:[60.0, 15.0,
100.0]') RETURN n; I am only able to get the nearest node even though
there are multiple nodes situated within the given distance. Have I
misunderstood that withinDistance should return all nodes within the
given distance ordered by distance? Is there any way to return the
distance metric too? I really would like to tell UserA that UserB is
only 200 metres away.
2. Another thing is that I would like to differentiate between the
node type User and Place, is it possible to filter the withinDistance
query just to return my Users för example?
3. My users location will be updated every 10 minutes or so. When I
tried to only update the User nodes lat and lon property I get a
"NotFoundException: NODE[28] has no property with
propertyKey=\"bbox\"."}System.Exception {Neo4jClient.NeoException} the
next time I execute the withinDistance query. What is the correct way
to update a location, should I remove the node from the point layer
and add it again if the lat and lon change and how do I do that, the
manual at http://neo4j.github.io/spatial/ which I have been following
only tells how to add a node to a layer.
4. Another thing I would like to do is set the nearest City for every
logged in User. Is there any way to get the nearest Place from a given
point without specify a distance?
Many thanks,
Jenny.
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