Created question in FIWARE Q/A platform on 17-03-2016 at 16:03
Please, ANSWER this question AT http://stackoverflow.com/questions/36064565/fiware-orion-subscription-with-georel-expression-in-condition

Question:
Fiware orion subscription with georel expression in condition

Description:
I have an entity in my orion DB:

{
"id"=>"User-121",
"type"=>"User",
"location"=>

{ "type"=>"geo:point", "value"=>"59.851484, 30.199463" }

,
"time"=>{"type"=>"none", "value"=>222909, "metadata"=>{}}
}

Also, I have 3 subscriptions to this entity, which have the same coordinates in condition's expression:

Should trigger when the entity is located, at least 100 meters far away from the reference point.

{
"id"=>"...",
"expires"=>"...",
"status"=>"active",
"subject"=>{
"entities"=>[

{"id"=>"User-121", "idPattern"=>"", "type"=>"User"}],
"condition"=>{
"attributes"=>["location", "time"],
"expression"=>{ "q"=>"", "geometry"=>"point", "coords"=>"59.851484, 30.199463", "georel"=>"near;minDistance:100"}
}
},
"notification"=>{ "callback"=>"http://callback", "attributes"=>["time"] }
}




Should trigger when the entity is located, at a maximum, 100 meters far away from the reference point



{
"id"=>"...",
"expires"=>"...",
"status"=>"active",
"subject"=>{
"entities"=>[{"id"=>"User-121", "idPattern"=>"", "type"=>"User"}

],
"condition"=>{
"attributes"=>["location", "time"],
"expression"=>

{ "q"=>"", "geometry"=>"point", "coords"=>"59.851484, 30.199463", "georel"=>"near;maxDistance:100"}

}
},
"notification"=>

{ "callback"=>"http://callback", "attributes"=>["time"] }

},

Should trigger when the entity is located at the reference point (has the same coordinates)

{
"id"=>"...",
"expires"=>"...",
"status"=>"active",
"subject"=>{
"entities"=>[

{"id"=>"User-121", "idPattern"=>"", "type"=>"User"}

],
"condition"=>{
"attributes"=>["location", "time"],
"expression"=>

{ "q"=>"", "geometry"=>"point", "coords"=>"59.851484, 30.199463", "georel"=>"equals"}

}
},
"notification"=>

{ "callback"=>"http://callback", "attributes"=>["time"] }

}

The problem is that all of the subscriptions send notifications each time I update the entity. It doesn't even depend on the entity's coordinates values. Whatever the coordinates are, I always receive 3 notifications of any update.

What am I doing wrong ?