From 98eff0cef58840bceeea4e3dfc418638a4739578 Mon Sep 17 00:00:00 2001
From: "T. Franzel" <tfranzel@users.noreply.github.com>
Date: Tue, 26 Dec 2023 22:40:49 +0100
Subject: [PATCH] coerse Decimal to float format explicitly #1134

this is to prevent accidental scientific notation and
thus introducing !!float yaml tag that NOBODY likes.
---
 drf_spectacular/renderers.py |  2 +-
 tests/test_validators.py     | 11 +++++++++++
 tests/test_validators.yml    | 14 ++++++++++++++
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/drf_spectacular/renderers.py b/drf_spectacular/renderers.py
index d3ee898c..1e4c0373 100644
--- a/drf_spectacular/renderers.py
+++ b/drf_spectacular/renderers.py
@@ -30,7 +30,7 @@ def multiline_str_representer(dumper, data):
 
         def decimal_representer(dumper, data):
             # prevent emitting "!! float" tags on fractionless decimals
-            value = str(data)
+            value = f'{data:f}'
             if '.' in value:
                 return dumper.represent_scalar('tag:yaml.org,2002:float', value)
             else:
diff --git a/tests/test_validators.py b/tests/test_validators.py
index 0f244444..e330288d 100644
--- a/tests/test_validators.py
+++ b/tests/test_validators.py
@@ -1,5 +1,6 @@
 import sys
 from datetime import timedelta
+from decimal import Decimal
 from unittest import mock
 
 import pytest
@@ -53,6 +54,16 @@ class XSerializer(serializers.Serializer):
             decimal_places=1,
             validators=[validators.DecimalValidator(max_digits=4, decimal_places=2)],
         )
+        decimal_validator_decimal = serializers.DecimalField(
+            max_digits=9,
+            decimal_places=7,
+            validators=[validators.MinValueValidator(Decimal("0.0000000001"))]
+        )
+        decimal_min_value_decimal = serializers.DecimalField(
+            decimal_places=2,
+            max_digits=5,
+            min_value=Decimal('0.000000000000000000000001'),
+        )
 
         # The following only apply for `array` type:
         list_max_length = serializers.ListField(validators=[validators.MaxLengthValidator(200)])
diff --git a/tests/test_validators.yml b/tests/test_validators.yml
index c68d8654..2754e259 100644
--- a/tests/test_validators.yml
+++ b/tests/test_validators.yml
@@ -126,6 +126,18 @@ components:
           minimum: -100
           exclusiveMaximum: true
           exclusiveMinimum: true
+        decimal_validator_decimal:
+          type: number
+          format: double
+          maximum: 100
+          minimum: 0.0000000001
+          exclusiveMaximum: true
+        decimal_min_value_decimal:
+          type: number
+          format: double
+          maximum: 1000
+          minimum: 0.000000000000000000000001
+          exclusiveMaximum: true
         list_max_length:
           type: array
           items: {}
@@ -183,6 +195,8 @@ components:
       - decimal_decimal
       - decimal_max_value
       - decimal_min_value
+      - decimal_min_value_decimal
+      - decimal_validator_decimal
       - dict_max_length
       - dict_min_length
       - file_extension