Support persisting docs for materialized_view materializations (#98)

Co-authored-by: Anders <anders.swanson@dbtlabs.com>
Co-authored-by: Colin <colin.rogers@dbtlabs.com>

.changes/unreleased/Fixes-20240626-163930.yaml

@@ -0,0 +1,6 @@
+kind: Fixes
+body: Fix `persist_docs` for `materialized_view` materializations. Previously, using this configuration with materialized view models would lead to an error.
+time: 2024-06-26T16:39:30.455995+02:00
+custom:
+    Author: morsapaes
+    Issue: "120"

dbt/include/postgres/macros/adapters.sql

@@ -196,7 +196,12 @@
 
 {% macro postgres__alter_relation_comment(relation, comment) %}
   {% set escaped_comment = postgres_escape_comment(comment) %}
-  comment on {{ relation.type }} {{ relation }} is {{ escaped_comment }};
+  {% if relation.type == 'materialized_view' -%}
+    {% set relation_type = "materialized view" %}
+  {%- else -%}
+    {%- set relation_type = relation.type -%}
+  {%- endif -%}
+  comment on {{ relation_type }} {{ relation }} is {{ escaped_comment }};
 {% endmacro %}
 
 

tests/functional/shared_tests/test_persist_docs.py

@@ -1,8 +1,29 @@
+import pytest
+import json
+
+from dbt.tests.adapter.materialized_view import files
 from dbt.tests.adapter.persist_docs.test_persist_docs import (
     BasePersistDocs,
     BasePersistDocsColumnMissing,
     BasePersistDocsCommentOnQuotedColumn,
 )
+from tests.functional.utils import run_dbt
+
+_MATERIALIZED_VIEW_PROPERTIES__SCHEMA_YML = """
+version: 2
+
+models:
+  - name: my_materialized_view
+    description: |
+      Materialized view model description "with double quotes"
+      and with 'single  quotes' as welll as other;
+      '''abc123'''
+      reserved -- characters
+      80% of statistics are made up on the spot
+      --
+      /* comment */
+      Some $lbl$ labeled $lbl$ and $$ unlabeled $$ dollar-quoting
+"""
 
 
 class TestPersistDocs(BasePersistDocs):
@@ -15,3 +36,30 @@ class TestPersistDocsColumnMissing(BasePersistDocsColumnMissing):
 
 class TestPersistDocsCommentOnQuotedColumn(BasePersistDocsCommentOnQuotedColumn):
     pass
+
+
+class TestPersistDocsWithMaterializedView(BasePersistDocs):
+    @pytest.fixture(scope="class", autouse=True)
+    def seeds(self):
+        return {"my_seed.csv": files.MY_SEED}
+
+    @pytest.fixture(scope="class")
+    def models(self):
+        return {
+            "my_materialized_view.sql": files.MY_MATERIALIZED_VIEW,
+        }
+
+    @pytest.fixture(scope="class")
+    def properties(self):
+        return {
+            "schema.yml": _MATERIALIZED_VIEW_PROPERTIES__SCHEMA_YML,
+        }
+
+    def test_has_comments_pglike(self, project):
+        run_dbt(["docs", "generate"])
+        with open("target/catalog.json") as fp:
+            catalog_data = json.load(fp)
+        assert "nodes" in catalog_data
+        assert len(catalog_data["nodes"]) == 2
+        view_node = catalog_data["nodes"]["model.test.my_materialized_view"]
+        assert view_node["metadata"]["comment"].startswith("Materialized view model description")