Hi,
since the 0.3.7 release a great feature of many to many relationships
disappeared. The following code refers to the Wiki example for many to
many relationships. With 0.3.6 I could either write
session.query(Article).select_by(keywords=politics)
(where 'politics' is the object representing the politics keyword) or
write
session.query(Article).select_by(keyword_name="politics")
With 0.3.7 only the second approach works. Is there an easy way to get
both mappings work again?
There was some discussion about a related issue in the "Issue using
rev 2425" thread - but the solution seemed quite complicated.
The following python script (a slightly modified version of the wiki
example) demonstrates the problem.
Regards,
David
from sqlalchemy import *
from sqlalchemy.orm import *
metadata = MetaData()
articles_table = Table('articles', metadata,
Column('article_id', Integer, primary_key = True),
Column('headline', String(150), key='headline'),
Column('body', TEXT, key='body'),
)
keywords_table = Table('keywords', metadata,
Column('keyword_id', Integer, primary_key = True),
Column('keyword_name', String(50))
)
itemkeywords_table = Table('article_keywords', metadata,
Column('article_id', Integer, ForeignKey("articles.article_id")),
Column('keyword_id', Integer, ForeignKey("keywords.keyword_id"))
)
engine = create_engine('sqlite:///')
metadata.create_all(engine)
class Keyword(object):
def __init__(self, name):
self.keyword_name = name
class Article(object):
pass
mapper(Keyword, keywords_table)
mapper(Article, articles_table, properties = dict(
keywords = relation(Keyword, secondary=itemkeywords_table,
lazy=False)
)
)
session = create_session(bind_to=engine)
politics = Keyword('politics')
entertainment = Keyword('entertainment')
article = Article()
article.headline = 'a headline'
article.body = 'this is the body'
article.keywords.append(politics)
article.keywords.append(entertainment)
session.save(article)
session.flush()
print session.query(Article).select_by(keyword_name="politics")
print session.query(Article).select_by(keywords=politics)
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