Use TMSTileFilter from DRF-GIS

Author: Gaël UTARD

geotrek/core/migrations/0019_auto_20201112_1010.py

@@ -0,0 +1,19 @@
+# Generated by Django 2.2.17 on 2020-11-12 10:10
+
+import django.contrib.gis.db.models.fields
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0018_remove_other_objects_from_factories'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='path',
+            name='geom',
+            field=django.contrib.gis.db.models.fields.LineStringField(srid=2154),
+        ),
+    ]

geotrek/core/models.py

@@ -58,7 +58,7 @@ def get_queryset(self):
 
 class Path(AddPropertyMixin, MapEntityMixin, AltimetryMixin,
            TimeStampedModelMixin, StructureRelated):
-    geom = models.LineStringField(srid=settings.SRID, spatial_index=False)
+    geom = models.LineStringField(srid=settings.SRID)
     geom_cadastre = models.LineStringField(null=True, srid=settings.SRID, spatial_index=False,
                                            editable=False)
     valid = models.BooleanField(default=True, verbose_name=_("Validity"),

mapentity/registry.py

@@ -65,6 +65,7 @@ def scan_views(self):
         # Filter to views inherited from MapEntity base views
         picked = []
         rest_viewset = None
+        tile_view = None
         list_view = None
 
         for name, view in inspect.getmembers(views_module):
@@ -79,6 +80,8 @@ def scan_views(self):
                         if view_model is self.model:
                             if issubclass(view, mapentity_views.MapEntityViewSet):
                                 rest_viewset = view
+                            elif issubclass(view, mapentity_views.MapEntityTileLayer):
+                                tile_view = view
                             elif issubclass(view, mapentity_views.MapEntityList):
                                 picked.append(view)
                                 list_view = view
@@ -123,6 +126,18 @@ class dynamic_viewset(mapentity_views.MapEntityViewSet):
 
         self.rest_router.register(self.modelname + 's', rest_viewset, basename=self.modelname)
 
+        # Dynamically define tile view
+        if tile_view is None:
+            _queryset = self.get_queryset()
+            _serializer = self.get_tile_serializer()
+
+            class dynamic_tile_view(mapentity_views.MapEntityTileLayer):
+                queryset = _queryset
+                serializer_class = _serializer
+            tile_view = dynamic_tile_view
+
+        picked.append(tile_view)
+
         # Returns Django URL patterns
         return self.__view_classes_to_url(*picked)
 
@@ -151,6 +166,20 @@ class Meta:
 
         return Serializer
 
+    def get_tile_serializer(self):
+        _model = self.model
+
+        class Serializer(GeoFeatureModelSerializer):
+            api_geom = GeometryField(read_only=True, precision=7)
+
+            class Meta:
+                model = _model
+                geo_field = "api_geom"
+                id_field = 'id'
+                fields = ('id', )
+
+        return Serializer
+
     def get_queryset(self):
         return self.model.objects.all()
 

mapentity/views/__init__.py

@@ -37,7 +37,6 @@
 
 MAPENTITY_GENERIC_VIEWS = [
     MapEntityLayer,
-    MapEntityTileLayer,
     MapEntityList,
     MapEntityJsonList,
     MapEntityFormat,

mapentity/views/api.py

@@ -11,6 +11,8 @@
 
 from djgeojson.views import GeoJSONLayerView
 from rest_framework import viewsets
+from rest_framework.generics import ListAPIView
+from rest_framework.permissions import DjangoModelPermissionsOrAnonReadOnly
 
 from mapentity import models as mapentity_models
 from ..settings import API_SRID, app_settings
@@ -58,17 +60,18 @@ def render_to_response(self, context, **response_kwargs):
         return super(MapEntityLayer, self).render_to_response(context, **response_kwargs)
 
 
-class MapEntityTileLayer(MapEntityLayer):
-    geometry_field = 'simplified_geom'
+class MapEntityTileLayer(ListAPIView):
+    permission_classes = [DjangoModelPermissionsOrAnonReadOnly]
 
     @classmethod
     def get_entity_kind(cls):
         return mapentity_models.ENTITY_TILE_LAYER
 
     def get_queryset(self):
-        qs = super().get_queryset()
+        qs = self.queryset
         qs = qs.filter(geom__intersects=self.bbox)
-        return qs.annotate(simplified_geom=Func('geom', 2 * self.pixel_size, function='ST_SimplifyPreserveTopology'))
+        # qs = qs.filter(length__gte=2 * self.pixel_size)
+        return qs.annotate(api_geom=Transform(Func('geom', self.pixel_size, function='ST_SimplifyPreserveTopology'), API_SRID))
 
     @property
     def pixel_size(self):