[sqlalchemy] Re: Strange lazy-load query
On 7 Mar, 15:55, Michael Bayer mike...@zzzcomputing.com wrote: the left outer join means there is a lazy=False or lazy='joinedload' on the relationship, or in this case since its sporadic, the parent Invoice is likely being loaded with an option like joinedload(Product.vat). The options specified in Query get attached to lazy loaders later in the chain, if the given joinedload() chain doesn't start from the entity being queried (which is probably the case if the query uses joinedload() and not joinedload_all()). Problem solved, many thanks :) -- 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.
Re: [sqlalchemy] Declarative Class registry ?
there's no registry of tables to mappers. You'd need to track that yourself, or otherwise scan through all mappers (non-public attribute sqlalchemy.orm._mapper_registry) looking for tables (each mapper has a .local_table attribute). Note that many mappers can be created against a single table. To track yourself: from sqlalchemy.orm import mapper as _mapper import collections my_registry_of_tables = collections.defaultdict(set) def mapper(cls, table=None, *arg, **kw): my_registry_of_tables[table].add(cls) return _mapper(cls, table, *arg, **kw) from sqlalchemy.ext.declarative import declarative_base Base = declarative_base(mapper=mapper) On Mar 7, 2011, at 11:51 PM, James Mills wrote: Hello, Given a scenario where you're using declarative_base(...) and defining classes Is there a way to ask SA what the mapper class (declarative) is for a given table by inspecting something in metadata[table_name] ? cheers James -- 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.
Re: [sqlalchemy] Declarative Class registry ?
On Wed, Mar 9, 2011 at 2:16 AM, Michael Bayer mike...@zzzcomputing.com wrote: there's no registry of tables to mappers. You'd need to track that yourself, or otherwise scan through all mappers (non-public attribute sqlalchemy.orm._mapper_registry) looking for tables (each mapper has a .local_table attribute). Note that many mappers can be created against a single table. To track yourself: from sqlalchemy.orm import mapper as _mapper import collections my_registry_of_tables = collections.defaultdict(set) def mapper(cls, table=None, *arg, **kw): my_registry_of_tables[table].add(cls) return _mapper(cls, table, *arg, **kw) from sqlalchemy.ext.declarative import declarative_base Base = declarative_base(mapper=mapper) Thanks Michael. cheers James -- -- James Mills -- -- Problems are solved by method -- 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.
