well the way "out" for the moment is to not use reflection since its
screwing up with schemas.
On Feb 4, 1:27 pm, Andreas Jung <[EMAIL PROTECTED]> wrote:
> I am getting the following error when defining a one-to-many relationship
> using the following code:
>
> db = create_engine('postgres://postgres:[EMAIL PROTECTED]/eCommerce')
>
> metadata = BoundMetaData(db)
> mapperFactory = MapperFactory(metadata)
>
> ProductAward, ProductAwardTable = mapperFactory('ProductAward',
> schema='public')
> ProductFAQAreaUsedFor, ProductFAQAreaUsedForTable =
> mapperFactory('ProductFAQAreaUsedFor')
>
> ProductFAQArea, ProductFAQAreaTable= mapperFactory('ProductFAQArea',
> properties={
> 'faq_used_for' :
> relation(ProductFAQAreaUsedFor),
> })
>
> ProductFAQ, ProductFAQTable = mapperFactory('ProductFAQ', properties={
> 'faq_area' : relation(ProductFAQArea),
> })
>
> ProductScreenshot, ProductScreenshotTable =
> mapperFactory('ProductScreenshot')
>
> ProductInformation, ProductInformationTable =
> mapperFactory('ProductInformation',
> properties={
> 'faqs' : relation(ProductFAQ, backref='pi'),
> 'awards' : relation(ProductAward, backref='pi'),
> 'screenshots' : relation(ProductScreenshot,
> backref='pi')
> })
>
> The MapperFactory implementation looks like this:
>
> def myStr(cls):
> return '%s' % (cls.__name__,)
>
> class MapperFactory(object):
>
> def __init__(self, metadata):
> self.metadata = metadata
>
> def __call__(self, s, schema=None, properties={}):
> table = Table(s, self.metadata, schema=schema, autoload=True)
> newCls = new.classobj(s, (object,), {})
> newCls.__str__ = classmethod(myStr)
> newCls.__repr__ = classmethod(myStr)
> mapper(newCls, table, properties=properties)
> return newCls, table
>
> Note that the first MapperFactory is called with schema='public'. As soon
> as you define a table with schema != None I am running into this error.
> Is there any way out (especially when you have to deal with different
> schemas)?
>
> Andreas
> -----------------
>
> python2.4 07_shop2.py
> Traceback (most recent call last):
> File "07_shop2.py", line 33, in ?
> product =
> session.query(ProductInformation).select_by(SAPMaterialNumber='09172-0500')[0]
> File "build/bdist.macosx-10.3-i386/egg/sqlalchemy/orm/session.py", line
> 203, in query
> File "build/bdist.macosx-10.3-i386/egg/sqlalchemy/orm/mapper.py", line
> 1470, in class_mapper
> File "build/bdist.macosx-10.3-i386/egg/sqlalchemy/orm/mapper.py", line
> 259, in compile
> File "build/bdist.macosx-10.3-i386/egg/sqlalchemy/orm/mapper.py", line
> 279, in _compile_all
> File "build/bdist.macosx-10.3-i386/egg/sqlalchemy/orm/mapper.py", line
> 509, in _initialize_properties
> File "build/bdist.macosx-10.3-i386/egg/sqlalchemy/orm/interfaces.py",
> line 39, in init
> File "build/bdist.macosx-10.3-i386/egg/sqlalchemy/orm/properties.py",
> line 223, in do_init
> sqlalchemy.exceptions.ArgumentError: Error determining primary and/or
> secondary join for relationship 'awards' between mappers
> 'Mapper|ProductInformation|ProductInformation' and
> 'Mapper|ProductAward|ProductAward'. If the underlying error cannot be
> corrected, you should specify the 'primaryjoin' (and 'secondaryjoin', if
> there is an association table present) keyword arguments to the relation()
> function (or for backrefs, by specifying the backref using the backref()
> function with keyword arguments) to explicitly specify the join conditions.
> Nested error is "Table 'public.ProductAwardType' not defined"
>
> application_pgp-signature_part
> 1KDownload
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