Merge branch 'fix-create-element-browser' into 'master'

Avoid thousands of SQL queries when opening CreateElement in a browser

Closes #634

See merge request !1194

arkindex/documents/serializers/elements.py

@@ -364,19 +364,33 @@ class ElementCreateSerializer(ElementLightSerializer):
     Serialize an Element with a possible parent and image
     """
     type = serializers.SlugField(source='type.slug')
-    corpus = serializers.PrimaryKeyRelatedField(queryset=Corpus.objects.none())
+    corpus = serializers.PrimaryKeyRelatedField(
+        queryset=Corpus.objects.none(),
+        style={'base_template': 'input.html'},
+    )
     image = serializers.PrimaryKeyRelatedField(
         queryset=Image.objects.using('default').all().select_related('server'),
         required=False,
         help_text='Link this element to an image by UUID via a polygon.',
+        style={'base_template': 'input.html'},
+    )
+    parent = serializers.PrimaryKeyRelatedField(
+        queryset=Element.objects.none(),
+        required=False,
+        allow_null=True,
+        style={'base_template': 'input.html'},
     )
-    parent = serializers.PrimaryKeyRelatedField(queryset=Element.objects.none(), required=False, allow_null=True)
     polygon = LinearRingField(
         required=False,
         help_text='Set the polygon linking this element to the image. '
                   '`image` must be set when this field is set. Defaults to a rectangle taking up the whole image.',
     )
-    worker_version = serializers.PrimaryKeyRelatedField(queryset=WorkerVersion.objects.all(), required=False, allow_null=True)
+    worker_version = serializers.PrimaryKeyRelatedField(
+        queryset=WorkerVersion.objects.all(),
+        required=False,
+        allow_null=True,
+        style={'base_template': 'input.html'},
+    )
 
     class Meta(ElementLightSerializer.Meta):
         model = Element