fix(cli): handle list response for json/yaml output

Handle the case with the CLI where a list response is returned from
GitLab and json/yaml output is requested.

Add a functional CLI test to validate it works.

Closes: #2287

2 files changed, 48 insertions, 4 deletions

diff --git a/gitlab/v4/cli.py b/gitlab/v4/cli.py
index a4f4e2c..1a6ea39 100644
--- a/gitlab/v4/cli.py
+++ b/gitlab/v4/cli.py
@@ -387,9 +387,9 @@ def extend_parser(parser: argparse.ArgumentParser) -> argparse.ArgumentParser:
 
 
 def get_dict(
-    obj: Union[str, gitlab.base.RESTObject], fields: List[str]
+    obj: Union[str, Dict[str, Any], gitlab.base.RESTObject], fields: List[str]
 ) -> Union[str, Dict[str, Any]]:
-    if isinstance(obj, str):
+    if not isinstance(obj, gitlab.base.RESTObject):
         return obj
 
     if fields:
@@ -406,7 +406,7 @@ class JSONPrinter:
 
     @staticmethod
     def display_list(
-        data: List[Union[str, gitlab.base.RESTObject]],
+        data: List[Union[str, Dict[str, Any], gitlab.base.RESTObject]],
         fields: List[str],
         **_kwargs: Any,
     ) -> None:
@@ -431,7 +431,7 @@ class YAMLPrinter:
 
     @staticmethod
     def display_list(
-        data: List[Union[str, gitlab.base.RESTObject]],
+        data: List[Union[str, Dict[str, Any], gitlab.base.RESTObject]],
         fields: List[str],
         **_kwargs: Any,
     ) -> None:
diff --git a/tests/functional/cli/test_cli_repository.py b/tests/functional/cli/test_cli_repository.py
index 7f521b4..90adc5e 100644
--- a/tests/functional/cli/test_cli_repository.py
+++ b/tests/functional/cli/test_cli_repository.py
@@ -1,3 +1,7 @@
+import json
+import time
+
+
 def test_project_create_file(gitlab_cli, project):
     file_path = "README"
     branch = "main"
@@ -45,6 +49,46 @@ def test_list_all_commits(gitlab_cli, project):
     assert len(ret_all.stdout) > len(ret.stdout)
 
 
+def test_commit_merge_requests(gitlab_cli, project, merge_request, wait_for_sidekiq):
+    """This tests the `project-commit merge-requests` command and also tests
+    that we can print the result using the `json` formatter"""
+    # create and then merge a merge-request
+    mr = merge_request(source_branch="test_commit_merge_requests")
+    merge_result = mr.merge(should_remove_source_branch=True)
+    wait_for_sidekiq(timeout=60)
+    # Wait until it is merged
+    mr_iid = mr.iid
+    for _ in range(60):
+        mr = project.mergerequests.get(mr_iid)
+        if mr.merged_at is not None:
+            break
+        time.sleep(0.5)
+    assert mr.merged_at is not None
+    time.sleep(0.5)
+    wait_for_sidekiq(timeout=60)
+
+    commit_sha = merge_result["sha"]
+    cmd = [
+        "-o",
+        "json",
+        "project-commit",
+        "merge-requests",
+        "--project-id",
+        project.id,
+        "--id",
+        commit_sha,
+    ]
+    ret = gitlab_cli(cmd)
+    assert ret.success
+
+    json_list = json.loads(ret.stdout)
+    assert isinstance(json_list, list)
+    assert len(json_list) == 1
+    mr_dict = json_list[0]
+    assert mr_dict["id"] == mr.id
+    assert mr_dict["iid"] == mr.iid
+
+
 def test_revert_commit(gitlab_cli, project):
     commit = project.commits.list()[0]