Ajoutez des fichiers projet.

venv/Lib/site-packages/django/contrib/gis/db/models/sql/__init__.py

@@ -0,0 +1,7 @@
+from django.contrib.gis.db.models.sql.conversion import (
+    AreaField, DistanceField,
+)
+
+__all__ = [
+    'AreaField', 'DistanceField',
+]

venv/Lib/site-packages/django/contrib/gis/db/models/sql/conversion.py

@@ -0,0 +1,69 @@
+"""
+This module holds simple classes to convert geospatial values from the
+database.
+"""
+from decimal import Decimal
+
+from django.contrib.gis.measure import Area, Distance
+from django.db import models
+
+
+class AreaField(models.FloatField):
+    "Wrapper for Area values."
+    def __init__(self, geo_field):
+        super().__init__()
+        self.geo_field = geo_field
+
+    def get_prep_value(self, value):
+        if not isinstance(value, Area):
+            raise ValueError('AreaField only accepts Area measurement objects.')
+        return value
+
+    def get_db_prep_value(self, value, connection, prepared=False):
+        if value is None:
+            return
+        area_att = connection.ops.get_area_att_for_field(self.geo_field)
+        return getattr(value, area_att) if area_att else value
+
+    def from_db_value(self, value, expression, connection):
+        if value is None:
+            return
+        # If the database returns a Decimal, convert it to a float as expected
+        # by the Python geometric objects.
+        if isinstance(value, Decimal):
+            value = float(value)
+        # If the units are known, convert value into area measure.
+        area_att = connection.ops.get_area_att_for_field(self.geo_field)
+        return Area(**{area_att: value}) if area_att else value
+
+    def get_internal_type(self):
+        return 'AreaField'
+
+
+class DistanceField(models.FloatField):
+    "Wrapper for Distance values."
+    def __init__(self, geo_field):
+        super().__init__()
+        self.geo_field = geo_field
+
+    def get_prep_value(self, value):
+        if isinstance(value, Distance):
+            return value
+        return super().get_prep_value(value)
+
+    def get_db_prep_value(self, value, connection, prepared=False):
+        if not isinstance(value, Distance):
+            return value
+        distance_att = connection.ops.get_distance_att_for_field(self.geo_field)
+        if not distance_att:
+            raise ValueError('Distance measure is supplied, but units are unknown for result.')
+        return getattr(value, distance_att)
+
+    def from_db_value(self, value, expression, connection):
+        if value is None:
+            return
+        distance_att = connection.ops.get_distance_att_for_field(self.geo_field)
+        return Distance(**{distance_att: value}) if distance_att else value
+
+    def get_internal_type(self):
+        return 'DistanceField'