fix: route RequestBodyPlainText to request_body_data instead of request_body_json

RequestBodyPlainText was incorrectly grouped with RequestBodyJsonObject in
_resolve_request_body, causing plain text body values to be routed to
request_body_json. This caused a ValueError('Request body json cannot be
a string') when using RequestBodyPlainText in connector builder.

The fix routes RequestBodyPlainText to request_body_data, which correctly
handles string payloads as plain text request bodies.

Co-Authored-By: Vai Ignatavicius <vaidotas.ignatavicius@airbyte.io>

Author: devin-ai-integration[bot]

airbyte_cdk/sources/declarative/requesters/request_options/interpolated_request_options_provider.py

@@ -101,8 +101,10 @@ def _resolve_request_body(self) -> None:
                 self.request_body_data = self.request_body.value
             elif self.request_body.type == "RequestBodyGraphQL":
                 self.request_body_json = self.request_body.value.dict(exclude_none=True)
-            elif self.request_body.type in ("RequestBodyJsonObject", "RequestBodyPlainText"):
+            elif self.request_body.type == "RequestBodyJsonObject":
                 self.request_body_json = self.request_body.value
+            elif self.request_body.type == "RequestBodyPlainText":
+                self.request_body_data = self.request_body.value
             else:
                 raise ValueError(f"Unsupported request body type: {self.request_body.type}")
 

unit_tests/sources/declarative/requesters/request_options/test_interpolated_request_options_provider.py

@@ -211,14 +211,6 @@ def test_interpolated_request_json(test_name, input_request_json, expected_reque
             RequestBodyJsonObject(type="RequestBodyJsonObject", value={"none_value": "{{ None }}"}),
             {},
         ),
-        (
-            "test_string",
-            RequestBodyPlainText(
-                type="RequestBodyPlainText",
-                value="""{"nested": { "key": "{{ config['option'] }}" }}""",
-            ),
-            {"nested": {"key": "OPTION"}},
-        ),
         (
             "test_nested_objects",
             RequestBodyJsonObject(
@@ -345,6 +337,22 @@ def test_interpolated_request_data(test_name, input_request_data, expected_reque
             ),
             {"2020-01-01 - 12345": "ABC"},
         ),
+        (
+            "test_plain_text_static_value",
+            RequestBodyPlainText(
+                type="RequestBodyPlainText",
+                value="plain text body",
+            ),
+            "plain text body",
+        ),
+        (
+            "test_plain_text_with_interpolation",
+            RequestBodyPlainText(
+                type="RequestBodyPlainText",
+                value="{{ config['option'] }}",
+            ),
+            "OPTION",
+        ),
     ],
 )
 def test_interpolated_request_data_using_request_body(