If filtering the results after the search, recalculating the facets
is too complicated, so we use the alternative approach of doing the
spatial search first and adding the ids as a filter in the Solr query.
Search results coming from the default CKAN search (which are received
via the `search` method of the `IPackageController` interface) are
filtered to only contain the ones intersecting the provided bbox.
The search form temporarily shows a text field, which will be replaced
by a nice map widget.
The spatial_query plugin now automatically checks for the existance of an
'spatial' extra when creating, updating or deleting a package and syncs its
value (in GeoJSON format) with the geometry column of the package_extent
table. The extension now uses GeoAlchemy, that makes performing spatial
operation extremely easy. The geometry field has been updated to support
multiple geometry types (Polygons, Points, MultiPolygons...) and the default
srid has been set as WGS 84 lat/lon (EPSG:4326).
amercader
james gardner