feat: add pydantic model for Problem response schema

fastapi_rfc7807/schema.py

@@ -0,0 +1,15 @@
+"""Pydantic model for the Problem response schema."""
+
+from typing import Optional
+
+from pydantic import BaseModel
+
+
+class Problem(BaseModel):
+    """Model of the RFC7807 Problem response schema."""
+
+    type: str
+    title: str
+    status: Optional[int]
+    detail: Optional[str]
+    instance: Optional[str]

requirements.txt

@@ -4,7 +4,6 @@
 #
 #    pip-compile --output-file=requirements.txt setup.py
 #
-dataclasses==0.7          # via pydantic
 fastapi==0.60.1           # via fastapi_rfc7807 (setup.py)
-pydantic==1.6.1           # via fastapi
+pydantic==1.6.1           # via fastapi, fastapi_rfc7807 (setup.py)
 starlette==0.13.6         # via fastapi, fastapi_rfc7807 (setup.py)

setup.py

@@ -42,6 +42,7 @@
     install_requires=[
         'fastapi',
         'starlette',
+        'pydantic',
     ],
     keywords=[
         'fastapi', 'errors', 'middleware', 'rfc7807',