GeoJSON Serializer / Pagination

[irees]

Create a GeoJSONSerializer to use in paginated responses; it creates the correct response, with the regular serializer in 'properties'

This would remove the separate and manual attribute mapping present in each controller.

Resolves #616

[irees]

Current GeoJSON:

{
    "type": "FeatureCollection",
    "features": [{
        "type": "Feature",
        "geometry": {
            "type": "Point",
            "coordinates": [-121.945154, 38.018914]
        },
        "properties": {
            "created_at": "2016-02-06T20:08:39.818Z",
            "updated_at": "2016-09-20T21:49:25.210Z",
            "onestop_id": "s-9q9-test",
            "tags": {
                "zone_id": "PITT",
                "stop_url": "http://www.bart.gov/stations/PITT/",
                "osm_way_id": "47228512",
                "wheelchair_boarding": "1"
            },
            "name": "Pittsburg/Bay Point",
            "identifiers": ["gtfs://f-9q9-bart/s/PITT"],
            "title": "Pittsburg/Bay Point",
            "timezone": "America/Los_Angeles",
            "operators_serving_stop": ["o-9q9-bart"],
            "routes_serving_stop": ["r-9q9-pittsburg~baypoint~sfia~millbrae"]
        },
        "id": "s-9q9-test"
    }]
}

Proposed GeoJSON, per_page=1

{
    "features": [{
        "geometry": {
            "type": "Point",
            "coordinates": [-121.945154, 38.018914]
        },
        "properties": {
            "identifiers": ["gtfs://f-9q9-bart/s/PITT"],
            "imported_from_feed_onestop_ids": ["f-9q9-bart"],
            "imported_from_feed_version_sha1s": ["dd7aca4a8e4c90908fd3603c097fabee75fea907", "a0a0e854e04362c0791629b91c93375f6471a2ea"],
            "created_or_updated_in_changeset_id": 924,
            "onestop_id": "s-9q9-test",
            "name": "Pittsburg/Bay Point",
            "tags": {
                "zone_id": "PITT",
                "stop_url": "http://www.bart.gov/stations/PITT/",
                "osm_way_id": "47228512",
                "wheelchair_boarding": "1"
            },
            "timezone": "America/Los_Angeles",
            "osm_way_id": 47228512,
            "served_by_vehicle_types": ["metro"],
            "wheelchair_boarding": true,
            "created_at": "2016-02-06T20:08:39.818Z",
            "updated_at": "2016-09-20T21:49:25.210Z",
            "operators_serving_stop": [{
                "operator_name": "Bay Area Rapid Transit",
                "operator_onestop_id": "o-9q9-bart"
            }],
            "routes_serving_stop": [{
                "operator_name": "Bay Area Rapid Transit",
                "operator_onestop_id": "o-9q9-bart",
                "route_name": "Pittsburg/Bay Point - SFIA/Millbrae",
                "route_onestop_id": "r-9q9-pittsburg~baypoint~sfia~millbrae"
            }]
        },
        "type": "Feature"
    }],
    "meta": {
        "sort_key": "id",
        "sort_order": "asc",
        "offset": 0,
        "per_page": 1,
        "next": "http://localhost:3000/api/v1/stops?offset=1&per_page=1&sort_key=id&sort_order=asc"
    }
}

Note: The top level type: "FeatureCollection" is still missing; working on getting it in the response now.

[irees]

TODO: Before merging, make list of any properties that are removed or changed.

[irees]

route stroke color

[irees]

rsp stroke color