From 8cbbbeb1630ff4d5732f2287b4985df84681af47 Mon Sep 17 00:00:00 2001
From: Tayler Sokalski <tsokalski@users.noreply.github.com>
Date: Mon, 17 Jul 2023 11:54:06 -0400
Subject: [PATCH] Fix conversion of Marshmallow field to OAS parameter to
 specify the deprecated flag on the parameter, not its schema.

---
 AUTHORS.rst                            | 1 +
 src/apispec/ext/marshmallow/openapi.py | 2 ++
 tests/test_ext_marshmallow_openapi.py  | 5 +++++
 3 files changed, 8 insertions(+)

diff --git a/AUTHORS.rst b/AUTHORS.rst
index 02662ceb..17bea2b9 100644
--- a/AUTHORS.rst
+++ b/AUTHORS.rst
@@ -77,3 +77,4 @@ Contributors (chronological)
 - Edwin Erdmanis `@vorticity <https://github.com/vorticity>`_
 - Mounier Florian `@paradoxxxzero <https://github.com/paradoxxxzero>`_
 - Renato Damas `@codectl <https://github.com/codectl>`_
+- Tayler Sokalski `@tsokalski <https://github.com/tsokalski>`_
diff --git a/src/apispec/ext/marshmallow/openapi.py b/src/apispec/ext/marshmallow/openapi.py
index a27bc4f7..22ff6ef0 100644
--- a/src/apispec/ext/marshmallow/openapi.py
+++ b/src/apispec/ext/marshmallow/openapi.py
@@ -197,6 +197,8 @@ def _field2parameter(
         else:
             if "description" in prop:
                 ret["description"] = prop.pop("description")
+            if "deprecated" in prop:
+                ret["deprecated"] = prop.pop("deprecated")
             ret["schema"] = prop
 
         for param_attr_func in self.parameter_attribute_functions:
diff --git a/tests/test_ext_marshmallow_openapi.py b/tests/test_ext_marshmallow_openapi.py
index 2617329b..ed7fb0ef 100644
--- a/tests/test_ext_marshmallow_openapi.py
+++ b/tests/test_ext_marshmallow_openapi.py
@@ -245,6 +245,11 @@ def test_field_required(self, openapi):
         res = openapi._field2parameter(field, name="field", location="query")
         assert res["required"] is True
 
+    def test_field_deprecated(self, openapi):
+        field = fields.Str(metadata={"deprecated": True})
+        res = openapi._field2parameter(field, name="field", location="query")
+        assert res["deprecated"] is True
+
     def test_schema_partial(self, openapi):
         class UserSchema(Schema):
             field = fields.Str(required=True)