create empty group when nothing selected

dbt_meshify/main.py

@@ -178,11 +178,6 @@ def create_group(
     """
     from dbt_meshify.utilities.grouper import ResourceGrouper
 
-    if not (select or exclude or selector):
-        raise Exception(
-            "Groups must be a subset of the resources in your project. Please provide a select, exclude, or selector argument to filter the resources in the project."
-        )
-
     path = Path(project_path).expanduser().resolve()
     project = DbtProject.from_directory(path)
 

dbt_meshify/utilities/grouper.py

@@ -76,9 +76,12 @@ def _generate_resource_group(
             resource_type=NodeType.Group,
         )
 
-        nodes = self.project.select_resources(
-            select=select, exclude=exclude, selector=selector, output_key="unique_id"
-        )
+        if not (select or exclude or selector):
+            nodes = set()
+        else:
+            nodes = self.project.select_resources(
+                select=select, exclude=exclude, selector=selector, output_key="unique_id"
+            )
 
         # Check if any of the selected nodes are already in a group of a different name. If so, raise an exception.
         nodes = set(filter(lambda x: not x.startswith("source"), nodes))

tests/integration/test_create_group_command.py

@@ -19,15 +19,31 @@
 
 
 @pytest.mark.parametrize(
-    "model_yml,start_group_yml,end_group_yml",
+    "model_yml,select,start_group_yml,end_group_yml",
     [
-        (model_yml_shared_model, group_yml_empty_file, expected_group_yml_no_group),
-        (model_yml_shared_model, group_yml_existing_groups, expected_group_yml_existing_groups),
-        (model_yml_shared_model, group_yml_group_predefined, expected_group_yml_no_group),
+        (
+            model_yml_shared_model,
+            "shared_model",
+            group_yml_empty_file,
+            expected_group_yml_no_group,
+        ),
+        (
+            model_yml_shared_model,
+            "shared_model",
+            group_yml_existing_groups,
+            expected_group_yml_existing_groups,
+        ),
+        (
+            model_yml_shared_model,
+            "shared_model",
+            group_yml_group_predefined,
+            expected_group_yml_no_group,
+        ),
+        (model_yml_shared_model, "", group_yml_empty_file, expected_group_yml_no_group),
     ],
-    ids=["1", "2", "3"],
+    ids=["1", "2", "3", "4"],
 )
-def test_create_group_command(model_yml, start_group_yml, end_group_yml):
+def test_create_group_command(model_yml, select, start_group_yml, end_group_yml):
     group_yml_file = proj_path / "models" / "_groups.yml"
     model_yml_file = proj_path / "models" / "_models.yml"
 
@@ -48,7 +64,7 @@ def test_create_group_command(model_yml, start_group_yml, end_group_yml):
         [
             "test_group",
             "--select",
-            "shared_model",
+            select,
             "--project-path",
             proj_path_string,
             "--owner-name",
@@ -68,25 +84,6 @@ def test_create_group_command(model_yml, start_group_yml, end_group_yml):
     assert actual == yaml.safe_load(end_group_yml)
 
 
-def test_group_command_no_selection_syntax():
-    """Test that the command fails if no selection syntax is provided"""
-    runner = CliRunner()
-    result = runner.invoke(
-        create_group,
-        [
-            "test_group",
-            "--project-path",
-            proj_path_string,
-            "--owner-name",
-            "Shaina Fake",
-            "--owner-email",
-            "[email protected]",
-        ],
-    )
-
-    assert result.exit_code == 1
-
-
 @pytest.mark.parametrize(
     "name,email,end_group_yml",
     [