Hi Michael,
On 02/05/2010 04:16 PM, Michael Bayer wrote:
Simone Orsi wrote:
Hi all,
can anybody explain why this:
session.query(Answer).all() - [Answer('...'), ... ]
works, but this:
session.query(func.sum(Answer.close_answer1)).all()
throws the following error?
*** AttributeError: 'MySQLCompiler' object has no attribute
'mapped_table'
The class 'Answer' is mapped correctly since I can search/insert/
update any records.
Thanks in advance
PS: sqlalchemy-0.5.8
there is likely an object being passed to the library at some point
incorrectly.Can't go any further without a complete stack trace.
here's the class
class Answer(object):
def __init__(self, **kwargs):
self.title = kwargs.get('title')
self.isMandatory = kwargs.get('isMandatory')
self.qtype = kwargs.get('qtype')
self.close_answer1 = kwargs.get('close_answer1')
self.close_answer2 = kwargs.get('close_answer2')
self.close_answer3 = kwargs.get('close_answer3')
self.close_answer4 = kwargs.get('close_answer4')
self.close_answer5 = kwargs.get('close_answer5')
self.close_answer0 = kwargs.get('close_answer0')
self.open_answer = kwargs.get('open_answer')
def __repr__(self):
return Answer('%s') % (self.title)
the table
tables['answers_table'] = Table('answers', metadata,
Column('id', Integer, primary_key=True),
Column('title', String),
Column('isMandatory', Boolean),
Column('qtype', String),
Column('close_answer1', Integer, default=0),
Column('close_answer2', Integer, default=0),
Column('close_answer3', Integer, default=0),
Column('close_answer4', Integer, default=0),
Column('close_answer5', Integer, default=0),
Column('close_answer0', Integer, default=0),
Column('open_answer', Text),
Column('question', Integer, ForeignKey('questions.id')),
Column('questionnaire', Integer,
ForeignKey('questionnaires.id')), )
and the mapper
mappers['answers_table'] = sa.orm.mapper(Answer,
tables['answers_table'],
allow_column_override=True,
properties = { '_question'
: sa.orm.relation(Question),
'_questionnaire' : sa.orm.relation(Questionnaire), })
What I'm tryin to do is to take the sum of every column column_answer*
for the entire table.
As I said I can do this
session.query(Answer).filter_by(questionnaire=questionnaire_sql_id,qtype='closed').all()
as well as other operations w/ that class but when I try to do this
sum = session.query([func.sum(Answer.close_answer1),
...]).filter_by(questionnaire=questionnaire_sql_id,qtype='closed').all()
no way... here's the log:
[...]
Module sqlalchemy.orm.session, line 763, in query
Module sqlalchemy.orm.query, line 68, in __init__
Module sqlalchemy.orm.query, line 74, in __init_mapper
AttributeError: 'MySQLCompiler' object has no attribute 'mapped_table'
Previous lines are Plone-related thus unuseful in this case...
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