Support building DbtDag without setting paths in ProjectConfig

cosmos/config.py

@@ -91,6 +91,13 @@ def __post_init__(self, dbt_project_path: str | Path | None) -> None:
         # allows us to initiate this attribute from Path objects and str
         self.dbt_ls_path = Path(self.dbt_ls_path) if self.dbt_ls_path else None
 
+    @property
+    def project_name(self) -> str:
+        if self.project_path:
+            return Path(self.project_path).stem
+        else:
+            return ""
+
     def validate_dbt_command(self, fallback_cmd: str | Path = "") -> None:
         """
         When using LoadMode.DBT_LS, the dbt executable path is necessary for rendering.

cosmos/converter.py

@@ -158,7 +158,7 @@ def validate_initial_user_config(
         )
 
 
-def validate_adapted_user_config(
+def validate_changed_config_paths(
     execution_config: ExecutionConfig | None, project_config: ProjectConfig, render_config: RenderConfig | None
 ):
     """
@@ -226,7 +226,7 @@ def __init__(
             render_config.project_path = project_config.dbt_project_path
             execution_config.project_path = project_config.dbt_project_path
 
-        validate_adapted_user_config(execution_config, project_config, render_config)
+        validate_changed_config_paths(execution_config, project_config, render_config)
 
         env_vars = copy.deepcopy(project_config.env_vars or operator_args.get("env"))
         dbt_vars = copy.deepcopy(project_config.dbt_vars or operator_args.get("vars"))
@@ -298,7 +298,7 @@ def __init__(
             execution_mode=execution_config.execution_mode,
             task_args=task_args,
             test_indirect_selection=execution_config.test_indirect_selection,
-            dbt_project_name=project_config.project_name,
+            dbt_project_name=render_config.project_name,
             on_warning_callback=on_warning_callback,
             render_config=render_config,
         )

tests/test_converter.py

@@ -413,6 +413,41 @@ def test_converter_multiple_calls_same_operator_args(
     assert operator_args == original_operator_args
 
 
+@patch("cosmos.config.ProjectConfig.validate_project")
+@patch("cosmos.converter.build_airflow_graph")
+@patch("cosmos.converter.DbtGraph.load")
+def test_validate_converter_fetches_project_name_from_render_config(
+    mock_dbt_graph_load, mock_build_airflow_graph, mock_validate_project
+):
+    """
+    Allow DbtToAirflowConverter to work when using:
+     - RenderMode.DBT_LS
+     - ExecutionConfig(dbt_project_path)
+     - RenderConfig(dbt_project_path)
+    In other words, when ProjectConfig does not contain name.
+
+    This scenario can be useful when using ExecutionMode.KUBERNETES or other similar ones and was found out during:
+    https://github.com/astronomer/astronomer-cosmos/pull/1297
+    """
+    execution_config = ExecutionConfig(dbt_project_path="/data/project1")
+    project_config = ProjectConfig()
+    profile_config = MagicMock()
+    render_config = RenderConfig(dbt_project_path="/home/usr/airflow/project1")
+
+    with DAG("test-id", start_date=datetime(2022, 1, 1)) as dag:
+        DbtToAirflowConverter(
+            dag=dag,
+            nodes=nodes,
+            project_config=project_config,
+            profile_config=profile_config,
+            execution_config=execution_config,
+            render_config=render_config,
+        )
+
+    mock_build_airflow_graph.assert_called_once()
+    assert mock_build_airflow_graph.call_args.kwargs["dbt_project_name"] == "project1"
+
+
 @pytest.mark.parametrize("invocation_mode", [None, InvocationMode.SUBPROCESS, InvocationMode.DBT_RUNNER])
 @patch("cosmos.config.ProjectConfig.validate_project")
 @patch("cosmos.converter.validate_initial_user_config")