Hi All,
Happy X'max :)
I'm implementing a tag schema using sqlalchemy, I follow the official
document's way:
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"))
)
# class definitions
class Keyword(object):
def __init__(self, name):
self.keyword_name = name
class Article(object):
pass
mapper(Keyword, keywords_table)
# define a mapper that does many-to-many on the 'itemkeywords'
association
# table
mapper(Article, articles_table, properties = dict(
keywords = relation(Keyword, secondary=itemkeywords_table,
lazy=False)
)
)
just that I didn't want to minimize duplication, so I remove all the
table name prefix in the column name, that is instead of "keyword_name"
I choose "name" (since it's in keyword table it must be keyword name),
here's the problem, if I try to get all the articles which have a
specific keyword, the doc says:
# select articles based on a keyword. select_by will handle the extra
joins.
sqlarticles = session.query(Article).select_by(keyword_name='politics')
but since I rename the keyword_name to name, how can I do this query
now ?
or there's no easy way to do it so I should duplicate all the table
name as the prefix in column name(which is ugly IMHO ;))?
Thanks
Qiang
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