Fix conversion of Marshmallow field to OAS parameter to specify the deprecated flag on the parameter, not its schema.

Author: tsokalski

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>`_

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:

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)