add DRF validation with JSON Schema

api/serializers.py

@@ -1,12 +1,28 @@
+import json
 import traceback
 from copy import deepcopy
 
+from django.conf import settings
+from jsonschema.validators import Draft7Validator
 from rest_framework import serializers
+from jsonschema import validate, ValidationError
 
 from diary.models import Diary
 
 
 class DiarySerializer(serializers.ModelSerializer):
+    def validate(self, attrs):
+        with open(settings.BASE_DIR / 'frontend' / 'src' / 'jsonSchemas' / 'diary.json') as f:
+            json_schema = json.load(f)
+
+        errors = Draft7Validator(json_schema).iter_errors(attrs)
+        messages = [e.message for e in errors]
+
+        if messages:
+            raise serializers.ValidationError(messages)
+
+        return attrs
+
     def create(self, validated_data):
         ModelClass = self.Meta.model
 

api/tests/test_serializers.py

@@ -0,0 +1,81 @@
+from api.serializers import DiarySerializer
+
+
+def test_JSONSchemaの仕様を満たす():
+    input_data = {
+        'content': {
+            'name': '3文字',
+            'note': '5文字です'
+        }
+    }
+
+    serializer = DiarySerializer(data=input_data)
+    assert serializer.is_valid()
+    assert serializer.errors == {}
+
+
+def test_nameが2文字():
+    input_data = {
+        'content': {
+            'name': '2字',
+            'note': '5文字です'
+        }
+    }
+
+    serializer = DiarySerializer(data=input_data)
+    assert serializer.is_valid() is False
+    assert serializer.errors['non_field_errors'] == ["'2字' is too short"]
+
+
+def test_noteが4文字():
+    input_data = {
+        'content': {
+            'name': '3文字',
+            'note': '4文字だ'
+        }
+    }
+
+    serializer = DiarySerializer(data=input_data)
+    assert serializer.is_valid() is False
+    assert serializer.errors['non_field_errors'] == ["'4文字だ' is too short"]
+
+
+def test_nameとnoteが短すぎる():
+    input_data = {
+        'content': {
+            'name': '2字',
+            'note': '4文字だ'
+        }
+    }
+
+    serializer = DiarySerializer(data=input_data)
+    assert serializer.is_valid() is False
+    assert serializer.errors['non_field_errors'] == ["'2字' is too short", "'4文字だ' is too short"]
+
+
+def test_nameとnoteが数字():
+    input_data = {
+        'content': {
+            'name': 123,
+            'note': 12345
+        }
+    }
+
+    serializer = DiarySerializer(data=input_data)
+    assert serializer.is_valid() is False
+    assert serializer.errors['non_field_errors'] == ["123 is not of type 'string'", "12345 is not of type 'string'"]
+
+
+def test_追加のプロパティが存在するためNG():
+    input_data = {
+        'content': {
+            'name': '3文字',
+            'note': '5文字です',
+            'additional': '追加したデータ'
+        }
+    }
+
+    serializer = DiarySerializer(data=input_data)
+    assert serializer.is_valid() is False
+    assert serializer.errors['non_field_errors'] \
+           == ["Additional properties are not allowed ('additional' was unexpected)"]

config/test_settings.py

@@ -0,0 +1 @@
+from .settings import *

pyproject.toml

@@ -0,0 +1,2 @@
+[tool.pytest.ini_options]
+DJANGO_SETTINGS_MODULE = "config.test_settings"