Source code for sqlalchemy_utils.types.ltree

from __future__ import absolute_import

from sqlalchemy import types
from sqlalchemy.dialects.postgresql import ARRAY
from sqlalchemy.dialects.postgresql.base import ischema_names, PGTypeCompiler
from sqlalchemy.sql import expression

from ..primitives import Ltree
from .scalar_coercible import ScalarCoercible


[docs]class LtreeType(types.Concatenable, types.UserDefinedType, ScalarCoercible): """Postgresql LtreeType type. The LtreeType datatype can be used for representing labels of data stored in hierarchial tree-like structure. For more detailed information please refer to http://www.postgresql.org/docs/current/static/ltree.html :: from sqlalchemy_utils import LtreeType class DocumentSection(Base): __tablename__ = 'document_section' id = sa.Column(sa.Integer, autoincrement=True) path = sa.Column(LtreeType) section = DocumentSection(name='Countries.Finland') session.add(section) session.commit() section.path # Ltree('Countries.Finland') .. note:: Using :class:`LtreeType`, :class:`LQUERY` and :class:`LTXTQUERY` types may require installation of Postgresql ltree extension on the server side. Please visit http://www.postgres.org for details. """ class comparator_factory(types.Concatenable.Comparator): def ancestor_of(self, other): if isinstance(other, list): return self.op('@>')(expression.cast(other, ARRAY(LtreeType))) else: return self.op('@>')(other) def descendant_of(self, other): if isinstance(other, list): return self.op('<@')(expression.cast(other, ARRAY(LtreeType))) else: return self.op('<@')(other) def lquery(self, other): if isinstance(other, list): return self.op('?')(expression.cast(other, ARRAY(LQUERY))) else: return self.op('~')(other) def ltxtquery(self, other): return self.op('@')(other) def bind_processor(self, dialect): def process(value): if value: return value.path return process def result_processor(self, dialect, coltype): def process(value): return self._coerce(value) return process def literal_processor(self, dialect): def process(value): value = value.replace("'", "''") return "'%s'" % value return process __visit_name__ = 'LTREE' def _coerce(self, value): if value: return Ltree(value)
class LQUERY(types.TypeEngine): """Postresql LQUERY type. See :class:`LTREE` for details. """ __visit_name__ = 'LQUERY' class LTXTQUERY(types.TypeEngine): """Postresql LTXTQUERY type. See :class:`LTREE` for details. """ __visit_name__ = 'LTXTQUERY' ischema_names['ltree'] = LtreeType ischema_names['lquery'] = LQUERY ischema_names['ltxtquery'] = LTXTQUERY def visit_LTREE(self, type_, **kw): return 'LTREE' def visit_LQUERY(self, type_, **kw): return 'LQUERY' def visit_LTXTQUERY(self, type_, **kw): return 'LTXTQUERY' PGTypeCompiler.visit_LTREE = visit_LTREE PGTypeCompiler.visit_LQUERY = visit_LQUERY PGTypeCompiler.visit_LTXTQUERY = visit_LTXTQUERY