Fix partial parsing bug with singular tests (#12224)

.changes/unreleased/Fixes-20251128-102129.yaml

@@ -0,0 +1,6 @@
+kind: Fixes
+body: Fix bug in partial parsing when updating a model with a schema file that is referenced by a singular test
+time: 2025-11-28T10:21:29.911147Z
+custom:
+    Author: mattogburke
+    Issue: "12223"

core/dbt/parser/partial.py

@@ -11,7 +11,13 @@ from dbt.contracts.files import (
     parse_file_type_to_parser,
 )
 from dbt.contracts.graph.manifest import Manifest
-from dbt.contracts.graph.nodes import AnalysisNode, ModelNode, SeedNode, SnapshotNode
+from dbt.contracts.graph.nodes import (
+    AnalysisNode,
+    GenericTestNode,
+    ModelNode,
+    SeedNode,
+    SnapshotNode,
+)
 from dbt.events.types import PartialParsingEnabled, PartialParsingFile
 from dbt.node_types import NodeType
 from dbt_common.context import get_invocation_context
@@ -970,7 +976,7 @@ class PartialParsing:
             for child_id in self.saved_manifest.child_map[unique_id]:
                 if child_id.startswith("test") and child_id in self.saved_manifest.nodes:
                     child_test = self.saved_manifest.nodes[child_id]
-                    if child_test.attached_node:
+                    if isinstance(child_test, GenericTestNode) and child_test.attached_node:
                         if child_test.attached_node in self.saved_manifest.nodes:
                             attached_node = self.saved_manifest.nodes[child_test.attached_node]
                             self.update_in_saved(attached_node.file_id)

tests/functional/partial_parsing/fixtures.py

@@ -553,6 +553,12 @@ select * from renamed
 
 """
 
+customers_yml = """
+models:
+  - name: customers
+    description: "This table contains customer data"
+"""
+
 model_four2_sql = """
 select fun from {{ ref('model_one') }}
 
@@ -689,6 +695,17 @@ select 1 as id, 101 as user_id, 'pending' as status
 
 """
 
+orders_sql_modified = """
+select 1 as id, 101 as user_id, 'completed' as status
+
+"""
+
+orders_singular_test_sql = """
+select * from {{ ref('orders') }}
+where status = 'invalid'
+
+"""
+
 orders_downstream_sql = """
 select * from {{ ref('orders') }}
 

tests/functional/partial_parsing/test_partial_parsing.py

@@ -65,7 +65,9 @@ from tests.functional.partial_parsing.fixtures import (
     my_macro2_sql,
     my_macro_sql,
     my_test_sql,
+    orders_singular_test_sql,
     orders_sql,
+    orders_sql_modified,
     raw_customers_csv,
     ref_override2_sql,
     ref_override_sql,
@@ -669,7 +671,7 @@ class TestSnapshots:
         assert len(results) == 1
 
 
-class TestTests:
+class TestGenericTests:
     @pytest.fixture(scope="class")
     def models(self):
         return {
@@ -723,6 +725,39 @@ class TestTests:
         assert expected_nodes == list(manifest.nodes.keys())
 
 
+class TestSingularTests:
+    @pytest.fixture(scope="class")
+    def models(self):
+        return {
+            "orders.sql": orders_sql,
+            "schema.yml": generic_schema_yml,
+        }
+
+    @pytest.fixture(scope="class")
+    def tests(self):
+        # Make sure "generic" directory is created
+        return {"generic": {"readme.md": ""}}
+
+    def test_pp_singular_tests(self, project):
+
+        # initial run
+        results = run_dbt()
+        assert len(results) == 1
+        manifest = get_manifest(project.project_root)
+        expected_nodes = ["model.test.orders", "test.test.unique_orders_id.1360ecc70e"]
+        assert expected_nodes == list(manifest.nodes.keys())
+
+        # add singular test in test-path
+        write_file(orders_singular_test_sql, project.project_root, "tests", "singular_test.sql")
+        results = run_dbt(["--partial-parse", "run"])
+        assert len(results) == 1
+
+        # modify model being tested by singular test
+        write_file(orders_sql_modified, project.project_root, "models", "orders.sql")
+        results = run_dbt(["--partial-parse", "run"])
+        assert len(results) == 1
+
+
 class TestExternalModels:
     @pytest.fixture(scope="class")
     def external_model_node(self):