chore: factorize json.dumps in an util function.

In order to use the Django JSON Encoder by default.

umap/fields.py

@@ -1,10 +1,11 @@
 import json
 
 import six
-from django.core.serializers.json import DjangoJSONEncoder
 from django.db import models
 from django.utils.encoding import smart_str
 
+from .utils import json_dumps
+
 
 class DictField(models.TextField):
     """
@@ -15,7 +16,7 @@ class DictField(models.TextField):
         if not value:
             value = {}
         if not isinstance(value, six.string_types):
-            value = json.dumps(value, cls=DjangoJSONEncoder)
+            value = json_dumps(value)
         return value
 
     def from_db_value(self, value, expression, connection):

umap/templatetags/umap_tags.py

@@ -1,9 +1,9 @@
-import json
 from copy import copy
 
 from django import template
 from django.conf import settings
-from django.core.serializers.json import DjangoJSONEncoder
+
+from umap.utils import json_dumps
 
 register = template.Library()
 
@@ -26,7 +26,7 @@ def map_fragment(map_instance, **kwargs):
     page = kwargs.pop("page", None) or ""
     unique_id = prefix + str(page) + "_" + str(map_instance.pk)
     return {
-        "map_settings": json.dumps(map_settings, cls=DjangoJSONEncoder),
+        "map_settings": json_dumps(map_settings),
         "map": map_instance,
         "unique_id": unique_id,
     }

umap/utils.py

@@ -1,7 +1,9 @@
 import gzip
+import json
 import os
 
 from django.conf import settings
+from django.core.serializers.json import DjangoJSONEncoder
 from django.urls import URLPattern, URLResolver, get_resolver
 
 
@@ -162,3 +164,8 @@ def merge_features(reference: list, latest: list, incoming: list):
         merged.append(item)
 
     return merged
+
+
+def json_dumps(obj, **kwargs):
+    """Utility using the Django JSON Encoder when dumping objects"""
+    return json.dumps(obj, cls=DjangoJSONEncoder, **kwargs)

umap/views.py

@@ -23,7 +23,6 @@ from django.contrib.staticfiles.storage import staticfiles_storage
 from django.core.exceptions import PermissionDenied
 from django.core.mail import send_mail
 from django.core.paginator import EmptyPage, PageNotAnInteger, Paginator
-from django.core.serializers.json import DjangoJSONEncoder
 from django.core.signing import BadSignature, Signer
 from django.core.validators import URLValidator, ValidationError
 from django.http import (
@@ -67,7 +66,14 @@ from .forms import (
     UserProfileForm,
 )
 from .models import DataLayer, Licence, Map, Pictogram, Star, TileLayer
-from .utils import ConflictError, _urls_for_js, gzip_file, is_ajax, merge_features
+from .utils import (
+    ConflictError,
+    _urls_for_js,
+    gzip_file,
+    is_ajax,
+    json_dumps,
+    merge_features,
+)
 
 User = get_user_model()
 
@@ -315,7 +321,7 @@ class UserDownload(DetailView, SearchMixin):
         with zipfile.ZipFile(zip_buffer, "a", zipfile.ZIP_DEFLATED, False) as zip_file:
             for map_ in self.get_maps():
                 umapjson = map_.generate_umapjson(self.request)
-                geojson_file = io.StringIO(json.dumps(umapjson, cls=DjangoJSONEncoder))
+                geojson_file = io.StringIO(json_dumps(umapjson))
                 file_name = f"umap_backup_{map_.slug}_{map_.pk}.umap"
                 zip_file.writestr(file_name, geojson_file.getvalue())
 
@@ -354,7 +360,7 @@ class MapsShowCase(View):
             }
 
         geojson = {"type": "FeatureCollection", "features": [make(m) for m in maps]}
-        return HttpResponse(smart_bytes(json.dumps(geojson, cls=DjangoJSONEncoder)))
+        return HttpResponse(smart_bytes(json_dumps(geojson)))
 
 
 showcase = MapsShowCase.as_view()
@@ -441,9 +447,7 @@ ajax_proxy = AjaxProxy.as_view()
 
 
 def simple_json_response(**kwargs):
-    return HttpResponse(
-        json.dumps(kwargs, cls=DjangoJSONEncoder), content_type="application/json"
-    )
+    return HttpResponse(json_dumps(kwargs), content_type="application/json")
 
 
 # ############## #
@@ -539,9 +543,7 @@ class MapDetailMixin:
             geojson["properties"] = {}
         geojson["properties"].update(properties)
         geojson["properties"]["datalayers"] = self.get_datalayers()
-        context["map_settings"] = json.dumps(
-            geojson, indent=settings.DEBUG, cls=DjangoJSONEncoder
-        )
+        context["map_settings"] = json_dumps(geojson, indent=settings.DEBUG)
         self.set_preconnect(geojson["properties"], context)
         return context
 
@@ -1105,7 +1107,7 @@ class DataLayerUpdate(FormLessEditMixin, GZipMixin, UpdateView):
 
             # Replace the uploaded file by the merged version.
             self.request.FILES["geojson"].file = BytesIO(
-                json.dumps(merged, cls=DjangoJSONEncoder).encode("utf-8")
+                json_dumps(merged).encode("utf-8")
             )
 
             # Mark the data to be reloaded by form_valid