Bases: QueryAction
Order Actions is populated by queryset when order_by() is called.
All required params are extracted but kept raw until actual filter clause value
is required -> then the action is converted into text() clause.
Extracted in order to easily change table prefixes on complex relations.
Source code in ormar\queryset\actions\select_action.py
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52 | class SelectAction(QueryAction):
"""
Order Actions is populated by queryset when order_by() is called.
All required params are extracted but kept raw until actual filter clause value
is required -> then the action is converted into text() clause.
Extracted in order to easily change table prefixes on complex relations.
"""
def __init__(
self, select_str: str, model_cls: Type["Model"], alias: str = None
) -> None:
super().__init__(query_str=select_str, model_cls=model_cls)
if alias: # pragma: no cover
self.table_prefix = alias
def _split_value_into_parts(self, order_str: str) -> None:
parts = order_str.split("__")
self.field_name = parts[-1]
self.related_parts = parts[:-1]
@property
def is_numeric(self) -> bool:
return self.get_target_field_type() in [int, float, decimal.Decimal]
def get_target_field_type(self) -> Any:
return self.target_model.Meta.model_fields[self.field_name].__type__
def get_text_clause(self) -> sqlalchemy.sql.expression.TextClause:
alias = f"{self.table_prefix}_" if self.table_prefix else ""
return sqlalchemy.text(f"{alias}{self.field_name}")
def apply_func(
self, func: Callable, use_label: bool = True
) -> sqlalchemy.sql.expression.TextClause:
result = func(self.get_text_clause())
if use_label:
rel_prefix = f"{self.related_str}__" if self.related_str else ""
result = result.label(f"{rel_prefix}{self.field_name}")
return result
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