aminghadersohi commented on code in PR #35018:
URL: https://github.com/apache/superset/pull/35018#discussion_r2334555965
##########
superset/daos/base.py:
##########
@@ -251,3 +455,205 @@ def filter_by(cls, **filter_by: Any) -> list[T]:
cls.id_column_name, data_model
).apply(query, None)
return query.filter_by(**filter_by).all()
+
+ @classmethod
+ def apply_column_operators(
+ cls, query: Any, column_operators: Optional[List[ColumnOperator]] =
None
+ ) -> Any:
+ """
+ Apply column operators (list of ColumnOperator) to the query using
+ ColumnOperatorEnum logic. Raises ValueError if a filter references a
+ non-existent column.
+ """
+ if not column_operators:
+ return query
+ for c in column_operators:
+ if not isinstance(c, ColumnOperator):
+ continue
+ col = c.col
+ opr = c.opr
+ value = c.value
+ if not col or not hasattr(cls.model_cls, col):
+ model_name = cls.model_cls.__name__ if cls.model_cls else
"Unknown"
+ logging.error(
+ f"Invalid filter: column '{col}' does not exist on
{model_name}"
+ )
+ raise ValueError(
+ f"Invalid filter: column '{col}' does not exist on
{model_name}"
+ )
+ column = getattr(cls.model_cls, col)
+ try:
+ # Always use ColumnOperatorEnum's apply method
+ operator_enum = ColumnOperatorEnum(opr)
+ query = query.filter(operator_enum.apply(column, value))
+ except Exception as e:
+ logging.error(f"Error applying filter on column '{col}': {e}")
+ raise
+ return query
+
+ @classmethod
+ def get_filterable_columns_and_operators(cls) -> Dict[str, List[str]]:
+ """
+ Returns a dict mapping filterable columns (including hybrid/computed
fields if
+ present) to their supported operators. Used by MCP tools to
dynamically expose
+ filter options. Custom fields supported by the DAO but not present on
the model
+ should be documented here.
+ """
+
+ mapper = inspect(cls.model_cls)
+ columns = {c.key: c for c in mapper.columns}
+ # Add hybrid properties
+ hybrids = {
+ name: attr
+ for name, attr in vars(cls.model_cls).items()
+ if isinstance(attr, hybrid_property)
+ }
+ # You may add custom fields here, e.g.:
+ # custom_fields = {"tags": ["eq", "in_", "like"], ...}
+ custom_fields: Dict[str, List[str]] = {}
+
+ filterable = {}
+ for name, col in columns.items():
+ if isinstance(col.type, (sa.String, sa.Text)):
+ filterable[name] = TYPE_OPERATOR_MAP["string"]
+ elif isinstance(col.type, (sa.Boolean,)):
+ filterable[name] = TYPE_OPERATOR_MAP["boolean"]
+ elif isinstance(col.type, (sa.Integer, sa.Float, sa.Numeric)):
+ filterable[name] = TYPE_OPERATOR_MAP["number"]
+ elif isinstance(col.type, (sa.DateTime, sa.Date, sa.Time)):
+ filterable[name] = TYPE_OPERATOR_MAP["datetime"]
+ else:
+ # Fallback to eq/ne/null
+ filterable[name] = ["eq", "ne", "is_null", "is_not_null"]
+ # Add hybrid properties as string fields by default
+ for name in hybrids:
+ filterable[name] = TYPE_OPERATOR_MAP["string"]
+ # Add custom fields
+ filterable.update(custom_fields)
+ return filterable
+
+ @classmethod
+ def _build_query(
+ cls,
+ column_operators: Optional[List[ColumnOperator]] = None,
+ search: Optional[str] = None,
+ search_columns: Optional[List[str]] = None,
+ custom_filters: Optional[Dict[str, BaseFilter]] = None,
+ skip_base_filter: bool = False,
+ data_model: Optional[SQLAInterface] = None,
+ ) -> Any:
+ """
+ Build a SQLAlchemy query with base filter, column operators, search,
and
+ custom filters.
+ """
+ if data_model is None:
+ data_model = SQLAInterface(cls.model_cls, db.session)
+ query = data_model.session.query(cls.model_cls)
+ query = cls._apply_base_filter(
+ query, skip_base_filter=skip_base_filter, data_model=data_model
+ )
+ if search and search_columns:
+ search_filters = []
+ for column_name in search_columns:
+ if hasattr(cls.model_cls, column_name):
+ column = getattr(cls.model_cls, column_name)
+ search_filters.append(cast(column,
Text).ilike(f"%{search}%"))
+ if search_filters:
+ query = query.filter(or_(*search_filters))
+ if custom_filters:
+ for filter_class in custom_filters.values():
+ query = filter_class.apply(query, None)
+ if column_operators:
+ query = cls.apply_column_operators(query, column_operators)
+ return query
+
+ @classmethod
+ def list( # noqa: C901
+ cls,
+ column_operators: Optional[List[ColumnOperator]] = None,
+ order_column: str = "changed_on",
+ order_direction: str = "desc",
+ page: int = 0,
+ page_size: int = 100,
+ search: Optional[str] = None,
+ search_columns: Optional[List[str]] = None,
+ custom_filters: Optional[Dict[str, BaseFilter]] = None,
+ columns: Optional[List[str]] = None,
+ ) -> Tuple[List[Any], int]:
+ """
+ Generic list method for filtered, sorted, and paginated results.
+ If columns is specified, returns a list of tuples (one per row),
+ otherwise returns model instances.
+ """
+ data_model = SQLAInterface(cls.model_cls, db.session)
+
+ column_attrs = []
+ relationship_loads = []
+ if columns is None:
+ columns = []
+ for name in columns:
+ attr = getattr(cls.model_cls, name, None)
+ if attr is None:
+ continue
+ prop = getattr(attr, "property", None)
+ if isinstance(prop, ColumnProperty):
+ column_attrs.append(attr)
+ elif isinstance(prop, RelationshipProperty):
+ relationship_loads.append(joinedload(attr))
Review Comment:
i had some initial trouble with using relations, so they aren't used right
now by the mcp service in its discovery tools. but thats a good flag to
revisit. i will write back my findings.
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