cause test failure using membership operator with node.config

core/dbt/contracts/graph/model_config.py

@@ -2,13 +2,13 @@ from dataclasses import field, Field, dataclass
 from enum import Enum
 from itertools import chain
 from typing import (
-    Any, List, Optional, Dict, Union, Type, TypeVar
+    Any, List, Optional, Dict, Union, Type, TypeVar, Callable
 )
 from dbt.dataclass_schema import (
-    dbtClassMixin, ValidationError, register_pattern,
+    dbtClassMixin, ValidationError, register_pattern
 )
 from dbt.contracts.graph.unparsed import AdditionalPropertiesAllowed
-from dbt.exceptions import InternalException
+from dbt.exceptions import InternalException, CompilationException
 from dbt.contracts.util import Replaceable, list_str
 from dbt import hooks
 from dbt.node_types import NodeType
@@ -204,6 +204,35 @@ class BaseConfig(
         else:
             self._extra[key] = value
 
+    # TODO: uncommenting this fixes test
+    # def __delitem__(self, key):
+    #     if hasattr(self, key):
+    #         msg = (
+    #             'Error, tried to delete config key "{}": Cannot delete '
+    #             'built-in keys'
+    #         ).format(key)
+    #         raise CompilationException(msg)
+    #     else:
+    #         del self._extra[key]
+
+    # def _content_iterator(self, include_condition: Callable[[Field], bool]):
+    #     seen = set()
+    #     for fld, _ in self._get_fields():
+    #         seen.add(fld.name)
+    #         if include_condition(fld):
+    #             yield fld.name
+
+    #     for key in self._extra:
+    #         if key not in seen:
+    #             seen.add(key)
+    #             yield key
+
+    # def __iter__(self):
+    #     yield from self._content_iterator(include_condition=lambda f: True)
+
+    # def __len__(self):
+    #     return len(self._get_fields()) + len(self._extra)
+
     @staticmethod
     def compare_key(
         unrendered: Dict[str, Any],

test/integration/043_custom_aliases_test/macros-configs/macros.sql

@@ -4,7 +4,7 @@
     {%- if custom_alias_name is none -%}
         {{ node.name }}
     {%- else -%}
-        custom_{{ node.config['alias'] | trim }}
+      custom_{{ node.config['alias'] if 'alias' in node.config else '' | trim }}
     {%- endif -%}
 {%- endmacro %}