Does Firebase “GeoFire” Enforce Identical Keys Between Nodes with Geo and non-Geo Data?

问题

The database structure for a Firebase "GeoFire" node must look like this (source)

"items" : {
    <itemId> : {
        "someData" : "someData",
        ...
    }
},
"items_location" : {
    <itemId> : {
        <geofireData> ...
    }
}

But one limitation of Geofire is that only single points can be stored and queried, and no objects like polygons. That's easy to work around - my code can query nearby points, and then reassemble the simple rectangles based on having the same key.

But in splitting my rectangles into individual points, I've created a GeoFire key with the following format

ABCD_0

Where ABCD is the original Primary Key of the rectangle, and _0 indicates which corner, so as to have each point with a unique key. One rectangle is represented in GeoFire as

"items" : {
   <ABCD_0> : {<objectData>},
   <ABCD_1> : {<objectData>},
   <ABCD_2> : {<objectData>},
   <ABCD_3> : {<objectData>}
},
"items_location" : {
    <ABCD_0> : {<geofireData 0>},
    <ABCD_1> : {<geofireData 1>},
    <ABCD_2> : {<geofireData 2>},
    <ABCD_3> : {<geofireData 3>}
}

But then to force identical keys in items and items_location, <objectData> is 4x redundant.

In order to decrease data volume, I'd like to use the original Primary Key in the items node, and then replicate the key with the _X structure for the items_location node. The App would then query GeoFire, get a list of (4) nearby keys, and then string-parse ABCD_X into ABCD, which it would use for the subsequent query.

"items" : {
   <ABCD> : {<objectData>},
 },
"items_location" : {
    <ABCD_0> : {<geofireData 0>},
    <ABCD_1> : {<geofireData 1>},
    <ABCD_2> : {<geofireData 2>},
    <ABCD_3> : {<geofireData 3>}
}

Will this break how GeoFire stores, indexes, retrieves and offlines data?

I'm especially concerned about how small sets of data is synchronized offline for individual apps. The entire geo-dataset is too large for a single app to store in its entirety offline.

来源：https://stackoverflow.com/questions/49379357/does-firebase-geofire-enforce-identical-keys-between-nodes-with-geo-and-non-ge

标签

firebase

geofire