Fix OpenAPI zero numeric bounds for list children (#9977)

Co-authored-by: Asif Saif Uddin {"Auvi":"অভি"} <auvipy@gmail.com>

Author: zainnadeem786

rest_framework/schemas/openapi.py

@@ -508,9 +508,9 @@ def map_field(self, field):
         return {'type': FIELD_CLASS_SCHEMA_TYPE.get(field.__class__, 'string')}
 
     def _map_min_max(self, field, content):
-        if field.max_value:
+        if field.max_value is not None:
             content['maximum'] = field.max_value
-        if field.min_value:
+        if field.min_value is not None:
             content['minimum'] = field.min_value
 
     def map_serializer(self, serializer):

tests/schemas/test_openapi.py

@@ -61,7 +61,15 @@ def test_list_field_mapping(self):
             (serializers.ListField(), {'items': {}, 'type': 'array'}),
             (serializers.ListField(child=serializers.BooleanField()), {'items': {'type': 'boolean'}, 'type': 'array'}),
             (serializers.ListField(child=serializers.FloatField()), {'items': {'type': 'number'}, 'type': 'array'}),
+            (serializers.ListField(child=serializers.FloatField(min_value=0.0)),
+             {'items': {'type': 'number', 'minimum': 0.0}, 'type': 'array'}),
+            (serializers.ListField(child=serializers.FloatField(max_value=0.0)),
+             {'items': {'type': 'number', 'maximum': 0.0}, 'type': 'array'}),
             (serializers.ListField(child=serializers.CharField()), {'items': {'type': 'string'}, 'type': 'array'}),
+            (serializers.ListField(child=serializers.IntegerField(min_value=0)),
+             {'items': {'type': 'integer', 'minimum': 0}, 'type': 'array'}),
+            (serializers.ListField(child=serializers.IntegerField(max_value=0)),
+             {'items': {'type': 'integer', 'maximum': 0}, 'type': 'array'}),
             (serializers.ListField(child=serializers.IntegerField(max_value=4294967295)),
              {'items': {'type': 'integer', 'maximum': 4294967295, 'format': 'int64'}, 'type': 'array'}),
             (serializers.ListField(child=serializers.ChoiceField(choices=[('a', 'Choice A'), ('b', 'Choice B')])),