Switch from checked_agg_time_dimension to checked_agg_time_dimension_for_measure

.changes/unreleased/Breaking Changes-20230711-162541.yaml

@@ -0,0 +1,6 @@
+kind: Breaking Changes
+body: Migrate from `checked_agg_time_dimension` to `checked_agg_time_dimension_for_measure`
+time: 2023-07-11T16:25:41.337984-07:00
+custom:
+  Author: QMalcolm
+  Issue: None

dbt_semantic_interfaces/implementations/elements/measure.py

@@ -7,7 +7,7 @@
     ModelWithMetadataParsing,
 )
 from dbt_semantic_interfaces.implementations.metadata import PydanticMetadata
-from dbt_semantic_interfaces.references import MeasureReference, TimeDimensionReference
+from dbt_semantic_interfaces.references import MeasureReference
 from dbt_semantic_interfaces.type_enums import AggregationType
 
 
@@ -45,15 +45,6 @@ class PydanticMeasure(HashableBaseModel, ModelWithMetadataParsing):
     non_additive_dimension: Optional[PydanticNonAdditiveDimensionParameters] = None
     agg_time_dimension: Optional[str] = None
 
-    @property
-    def checked_agg_time_dimension(self) -> TimeDimensionReference:  # noqa: D
-        assert self.agg_time_dimension, (
-            f"Aggregation time dimension for measure {self.name} is not set! This should either be set directly on "
-            f"the measure specification in the model, or else defaulted to the primary time dimension in the data "
-            f"source containing the measure."
-        )
-        return TimeDimensionReference(element_name=self.agg_time_dimension)
-
     @property
     def reference(self) -> MeasureReference:  # noqa: D
         return MeasureReference(element_name=self.name)

dbt_semantic_interfaces/implementations/semantic_model.py

@@ -14,6 +14,7 @@
 from dbt_semantic_interfaces.implementations.elements.measure import PydanticMeasure
 from dbt_semantic_interfaces.implementations.metadata import PydanticMetadata
 from dbt_semantic_interfaces.protocols import (
+    Measure,
     ProtocolHint,
     SemanticModel,
     SemanticModelDefaults,
@@ -22,6 +23,7 @@
     LinkableElementReference,
     MeasureReference,
     SemanticModelReference,
+    TimeDimensionReference,
 )
 
 
@@ -167,3 +169,15 @@ def get_entity(self, entity_reference: LinkableElementReference) -> PydanticEnti
                 return entity
 
         raise ValueError(f"No entity with name ({entity_reference}) in semantic_model with name ({self.name})")
+
+    def checked_agg_time_dimension_for_measure(self, measure: Measure):  # noqa: D
+        if self.defaults is not None:
+            default_agg_time_dimesion = self.defaults.agg_time_dimension
+
+        agg_time_dimension_name = measure.agg_time_dimension or default_agg_time_dimesion
+        assert agg_time_dimension_name is not None, (
+            f"Aggregation time dimension for measure {measure.name} is not set! This should either be set directly on "
+            f"the measure specification in the model, or else defaulted to the primary time dimension in the data "
+            f"source containing the measure."
+        )
+        return TimeDimensionReference(element_name=agg_time_dimension_name)

dbt_semantic_interfaces/protocols/measure.py

@@ -3,7 +3,7 @@
 from abc import abstractmethod
 from typing import Optional, Protocol, Sequence
 
-from dbt_semantic_interfaces.references import MeasureReference, TimeDimensionReference
+from dbt_semantic_interfaces.references import MeasureReference
 from dbt_semantic_interfaces.type_enums import AggregationType
 
 
@@ -87,12 +87,6 @@ def non_additive_dimension(self) -> Optional[NonAdditiveDimensionParameters]:  #
     def agg_time_dimension(self) -> Optional[str]:  # noqa: D
         pass
 
-    @property
-    @abstractmethod
-    def checked_agg_time_dimension(self) -> TimeDimensionReference:
-        """Returns the aggregation time dimension, throwing an exception if it's not set."""
-        ...
-
     @property
     @abstractmethod
     def reference(self) -> MeasureReference:

dbt_semantic_interfaces/protocols/semantic_model.py

@@ -11,6 +11,7 @@
     LinkableElementReference,
     MeasureReference,
     SemanticModelReference,
+    TimeDimensionReference,
 )
 
 
@@ -146,5 +147,13 @@ def reference(self) -> SemanticModelReference:
     def metadata(self) -> Optional[Metadata]:  # noqa: D
         pass
 
+    @abstractmethod
+    def checked_agg_time_dimension_for_measure(self, measure: Measure) -> TimeDimensionReference:
+        """Returns the `TimeDimensionReference` what a measure should use for it's `agg_time_dimension`.
+
+        Should raise an exception if a TimeDimensionReference cannot be built
+        """
+        ...
+
 
 SemanticModelT = TypeVar("SemanticModelT", bound=SemanticModel)

dbt_semantic_interfaces/transformations/pydantic_rule_set.py

@@ -10,9 +10,6 @@
 from dbt_semantic_interfaces.transformations.add_input_metric_measures import (
     AddInputMetricMeasuresRule,
 )
-from dbt_semantic_interfaces.transformations.agg_time_dimension import (
-    SetMeasureAggregationTimeDimensionRule,
-)
 from dbt_semantic_interfaces.transformations.boolean_measure import (
     BooleanMeasureAggregationRule,
 )
@@ -43,10 +40,7 @@ def _implements_protocol(self) -> SemanticManifestTransformRuleSet[PydanticSeman
 
     @property
     def primary_rules(self) -> Sequence[SemanticManifestTransformRule[PydanticSemanticManifest]]:  # noqa:
-        return (
-            LowerCaseNamesRule(),
-            SetMeasureAggregationTimeDimensionRule(),
-        )
+        return (LowerCaseNamesRule(),)
 
     @property
     def secondary_rules(self) -> Sequence[SemanticManifestTransformRule[PydanticSemanticManifest]]:  # noqa: D

dbt_semantic_interfaces/validations/agg_time_dimension.py

@@ -39,7 +39,7 @@ def _validate_semantic_model(semantic_model: SemanticModel) -> List[ValidationIs
                 ),
                 element_type=SemanticModelElementType.MEASURE,
             )
-            agg_time_dimension_reference = measure.checked_agg_time_dimension
+            agg_time_dimension_reference = semantic_model.checked_agg_time_dimension_for_measure(measure)
             if not SemanticModelValidationHelpers.time_dimension_in_model(
                 time_dimension_name=agg_time_dimension_reference.element_name, semantic_model=semantic_model
             ):

dbt_semantic_interfaces/validations/measures.py

@@ -232,12 +232,9 @@ def validate_manifest(semantic_manifest: SemanticManifestT) -> Sequence[Validati
                 non_additive_dimension = measure.non_additive_dimension
                 if non_additive_dimension is None:
                     continue
+                agg_time_dimension_reference = semantic_model.checked_agg_time_dimension_for_measure(measure)
                 agg_time_dimension = next(
-                    (
-                        dim
-                        for dim in semantic_model.dimensions
-                        if measure.checked_agg_time_dimension.element_name == dim.name
-                    ),
+                    (dim for dim in semantic_model.dimensions if agg_time_dimension_reference.element_name == dim.name),
                     None,
                 )
                 if agg_time_dimension is None:
@@ -253,7 +250,7 @@ def validate_manifest(semantic_manifest: SemanticManifestT) -> Sequence[Validati
                             ),
                             message=(
                                 f"Measure '{measure.name}' has a agg_time_dimension of "
-                                f"{measure.checked_agg_time_dimension.element_name} "
+                                f"{agg_time_dimension_reference.element_name} "
                                 f"that is not defined as a dimension in semantic model '{semantic_model.name}'."
                             ),
                         )

dbt_semantic_interfaces/validations/semantic_manifest_validator.py

@@ -29,7 +29,6 @@
 from dbt_semantic_interfaces.validations.reserved_keywords import ReservedKeywordsRule
 from dbt_semantic_interfaces.validations.semantic_models import (
     SemanticModelDefaultsRule,
-    SemanticModelTimeDimensionWarningsRule,
     SemanticModelValidityWindowRule,
 )
 from dbt_semantic_interfaces.validations.unique_valid_name import UniqueAndValidNameRule
@@ -62,7 +61,6 @@ class SemanticManifestValidator(Generic[SemanticManifestT]):
         DerivedMetricRule[SemanticManifestT](),
         CountAggregationExprRule[SemanticManifestT](),
         SemanticModelMeasuresUniqueRule[SemanticManifestT](),
-        SemanticModelTimeDimensionWarningsRule[SemanticManifestT](),
         SemanticModelValidityWindowRule[SemanticManifestT](),
         DimensionConsistencyRule[SemanticManifestT](),
         ElementConsistencyRule[SemanticManifestT](),

dbt_semantic_interfaces/validations/semantic_models.py

@@ -17,43 +17,6 @@
 logger = logging.getLogger(__name__)
 
 
-class SemanticModelTimeDimensionWarningsRule(
-    SemanticManifestValidationRule[SemanticManifestT], Generic[SemanticManifestT]
-):
-    """Checks time dimensions in semantic models."""
-
-    @staticmethod
-    @validate_safely(whats_being_done="running model validation ensuring time dimensions are defined properly")
-    def validate_manifest(semantic_manifest: SemanticManifestT) -> Sequence[ValidationIssue]:  # noqa: D
-        issues: List[ValidationIssue] = []
-
-        for semantic_model in semantic_manifest.semantic_models:
-            issues.extend(
-                SemanticModelTimeDimensionWarningsRule._validate_semantic_model(semantic_model=semantic_model)
-            )
-        return issues
-
-    @staticmethod
-    @validate_safely(whats_being_done="checking validity of the semantic model's time dimensions")
-    def _validate_semantic_model(semantic_model: SemanticModel) -> List[ValidationIssue]:
-        issues: List[ValidationIssue] = []
-
-        for measure in semantic_model.measures:
-            if measure.agg_time_dimension is None:
-                issues.append(
-                    ValidationError(
-                        context=SemanticModelContext(
-                            file_context=FileContext.from_metadata(metadata=semantic_model.metadata),
-                            semantic_model=SemanticModelReference(semantic_model_name=semantic_model.name),
-                        ),
-                        message=f"Aggregation time dimension not specified for measure named '{measure.name}' in the "
-                        f"semantic model named '{semantic_model.name}'. Please add one",
-                    )
-                )
-
-        return issues
-
-
 class SemanticModelValidityWindowRule(SemanticManifestValidationRule[SemanticManifestT], Generic[SemanticManifestT]):
     """Checks validity windows in semantic models to ensure they comply with runtime requirements."""
 

tests/validations/test_agg_time_dimension.py

@@ -45,6 +45,9 @@ def test_unset_aggregation_time_dimension(simple_semantic_manifest: PydanticSema
         lambda semantic_model: len(semantic_model.measures) > 0,
     )
 
+    if semantic_model_with_measures.defaults is not None:
+        semantic_model_with_measures.defaults.agg_time_dimension = None
+
     semantic_model_with_measures.measures[0].agg_time_dimension = None
 
     with pytest.raises(