I'm trying to implement associative table with extra field on join
table, but faced problems... what is it, that im doing wrong here,
because i get python error:
.
.
.
2007-10-27 14:58:26,816 INFO sqlalchemy.engine.base.Engine.0x..d0 {}
2007-10-27 14:58:26,816 INFO sqlalchemy.engine.base.Engine.0x..d0
COMMIT
ERROR: Internal Python error in the inspect module.
Below is the traceback from this internal error.
Traceback (most recent call last):
File "/usr/lib/python2.4/site-packages/IPython/ultraTB.py", line
462, in text
records = _fixed_getinnerframes(etb, context,self.tb_offset)
File "/usr/lib/python2.4/site-packages/IPython/ultraTB.py", line
118, in _fixed_getinnerframes
records = inspect.getinnerframes(etb, context)
File "inspect.py", line 804, in getinnerframes
framelist.append((tb.tb_frame,) + getframeinfo(tb, context))
File "inspect.py", line 768, in getframeinfo
lines, lnum = findsource(frame)
File "inspect.py", line 437, in findsource
if pat.match(lines[lnum]): break
IndexError: list index out of range
Unfortunately, your original traceback can not be constructed.
*************
countries_table = Table("countries", metadata,
Column("id", Integer, primary_key=True),
Column("alpha2", String(2)),
Column("alpha3", String(3)),
Column("name", Unicode(100)),
)
# association table with additional field
countries_languages = Table("countries_languages", metadata,
Column("country_id", Integer, ForeignKey('countries.id')),
Column("language_id", Integer, ForeignKey('languages.id')),
Column("is_primary", Boolean, default=False), # only one can be
default at time
)
languages_table = Table("languages", metadata,
Column("id", Integer, primary_key=True),
Column("alpha2", String(2)),
Column("name", Unicode(100)),
)
class BaseObject(object):
def __init__(self):
self._repr_ = []
def __repr__(self):
from string import join
str = ', '.join("'%s'" % (self.__dict__[v]) for v in
self._repr_)
return "<%s(%s)>" % (self.__class__, str)
class NameObject(BaseObject):
def __init__(self, name):
self.name = name
BaseObject.__init__(self)
def __repr__(self):
self._repr_ = ["name"]
return BaseObject.__repr__(self)
class Country(NameObject):
def __init__(self, alpha2, alpha3, name):
NameObject.__init__(self, name)
self.alpha2 = alpha2
self.alpha3 = alpha3
class CountryLanguage(object):
def __init__(self, is_primary = False):
self.is_primary = is_primary
class Language(NameObject):
def __init__(self, alpha2, name):
NameObject.__init__(self, name)
self.alpha2 = alpha2
mapper(Country, countries_table, properties={
'post_offices':relation(PostOffice, backref='country'), # one to
many
'languages':relation(CountryLanguage, backref='country'), # many
to many
}
)
mapper(CountryLanguage, countries_languages, properties={
'language':relation(Language, backref="countries")
}
)
mapper(Language, languages_table)
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