Method __init__

lib/sqlalchemy/orm/context.py:3190–3255

(
        self,
        compile_state,
        column,
        entities_collection,
        parententity,
        raw_column_index,
        is_current_entities,
        parent_bundle=None,
    )

    )

    def __init__(
        self,
        compile_state,
        column,
        entities_collection,
        parententity,
        raw_column_index,
        is_current_entities,
        parent_bundle=None,
    ):
        annotations = column._annotations

        _entity = parententity

        # an AliasedClass won't have proxy_key in the annotations for
        # a column if it was acquired using the class' adapter directly,
        # such as using AliasedInsp._adapt_element().  this occurs
        # within internal loaders.

        orm_key = annotations.get("proxy_key", None)
        proxy_owner = annotations.get("proxy_owner", _entity)
        if orm_key:
            self.expr = getattr(proxy_owner.entity, orm_key)
            self.translate_raw_column = False
        else:
            # if orm_key is not present, that means this is an ad-hoc
            # SQL ColumnElement, like a CASE() or other expression.
            # include this column position from the invoked statement
            # in the ORM-level ResultSetMetaData on each execute, so that
            # it can be targeted by identity after caching
            self.expr = column
            self.translate_raw_column = raw_column_index is not None

        self.raw_column_index = raw_column_index

        if is_current_entities:
            if parent_bundle:
                self._label_name = orm_key if orm_key else column._proxy_key
            else:
                self._label_name = compile_state._label_convention(
                    column, col_name=orm_key
                )
        else:
            self._label_name = None

        _entity._post_inspect
        self.entity_zero = self.entity_zero_or_selectable = ezero = _entity
        self.mapper = mapper = _entity.mapper

        if parent_bundle:
            parent_bundle._entities.append(self)
        else:
            entities_collection.append(self)

        compile_state._has_orm_entities = True

        self.column = column