sure probably, just compile the expression through the dialect and its fine
On Jun 21, 2011, at 3:28 PM, Filip Zyzniewski - Tefnet wrote: > Hi, > > I got an idea today and thought that maybe SQLAlchemy could support that > (copy at http://ideone.com/t42G4 ): > ====================================================== > # Fails with Python-2.7.0 and SQLAlchemy-0.7.1 > > import sqlalchemy > import sqlalchemy.ext.declarative > > Base = sqlalchemy.ext.declarative.declarative_base(mapper = > sqlalchemy.orm.mapper) > > > engine = > sqlalchemy.create_engine('postgres://tefbusiness_test:None@/tefbusiness_test_2', > echo = False) > > session = sqlalchemy.orm.scoped_session( > sqlalchemy.orm.sessionmaker( > bind = engine, > autocommit = False, > ) > ) > > Base.metadata.bind = engine > > class Person(Base): > Id = sqlalchemy.Column( sqlalchemy.types.Integer, primary_key = True, > autoincrement = True) > __tablename__ = 'person' > firstName = sqlalchemy.Column( sqlalchemy.types.String(128), nullable = > False) > lastName = sqlalchemy.Column( sqlalchemy.types.String(128), nullable = > False) > name = sqlalchemy.orm.column_property( > sqlalchemy.func.lower(firstName + ' ' + lastName) > ) > > __table_args__ = (sqlalchemy.schema.Index('foo', name.columns[0]), {}) > > """ > Traceback (most recent call last): > File "column_property_2.py", line 20, in <module> > class Person(Base): > File > "/home/filip/gitsrc/tefobjects/lib/python2.7/site-packages/SQLAlchemy-0.7.1-py2.7.egg/sqlalchemy/ext/declarative.py", > line 1128, in __init__ > _as_declarative(cls, classname, cls.__dict__) > File > "/home/filip/gitsrc/tefobjects/lib/python2.7/site-packages/SQLAlchemy-0.7.1-py2.7.egg/sqlalchemy/ext/declarative.py", > line 1027, in _as_declarative > **table_kw) > File > "/home/filip/gitsrc/tefobjects/lib/python2.7/site-packages/SQLAlchemy-0.7.1-py2.7.egg/sqlalchemy/schema.py", > line 265, in __new__ > table._init(name, metadata, *args, **kw) > File > "/home/filip/gitsrc/tefobjects/lib/python2.7/site-packages/SQLAlchemy-0.7.1-py2.7.egg/sqlalchemy/schema.py", > line 340, in _init > self._init_items(*args) > File > "/home/filip/gitsrc/tefobjects/lib/python2.7/site-packages/SQLAlchemy-0.7.1-py2.7.egg/sqlalchemy/schema.py", > line 64, in _init_items > item._set_parent_with_dispatch(self) > File > "/home/filip/gitsrc/tefobjects/lib/python2.7/site-packages/SQLAlchemy-0.7.1-py2.7.egg/sqlalchemy/events.py", > line 227, in _set_parent_with_dispatch > self._set_parent(parent) > File > "/home/filip/gitsrc/tefobjects/lib/python2.7/site-packages/SQLAlchemy-0.7.1-py2.7.egg/sqlalchemy/schema.py", > line 2112, in _set_parent > ColumnCollectionMixin._set_parent(self, table) > File > "/home/filip/gitsrc/tefobjects/lib/python2.7/site-packages/SQLAlchemy-0.7.1-py2.7.egg/sqlalchemy/schema.py", > line 1808, in _set_parent > self.columns.add(col) > File > "/home/filip/gitsrc/tefobjects/lib/python2.7/site-packages/SQLAlchemy-0.7.1-py2.7.egg/sqlalchemy/sql/expression.py", > line 2115, in add > self[column.key] = column > AttributeError: 'Function' object has no attribute 'key' > """ > ====================================================== > > If Index() could accept clauses as columns, then maybe we could get something > like: > name = sqlalchemy.orm.column_property( > sqlalchemy.func.lower(firstName + ' ' + lastName), > index = True > ) > > Most of the needed pieces are already in place. > PostgreSQL can do stuff like this: > ====================================================== > test=# CREATE INDEX ix_foo ON "teryt_Street" (lower(prename || ' ' || > postname)); > CREATE INDEX > test=# > ====================================================== > > What do you think :)? > > regards, > Filip Zyzniewski > Tefnet > > -- > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To post to this group, send email to sqlalchemy@googlegroups.com. > To unsubscribe from this group, send email to > sqlalchemy+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/sqlalchemy?hl=en. -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
