OK working, have an other problem but I will open a new thread about it. Thank you.
Julien. On 09/28/2010 09:20 PM, Julien Iguchi-Cartigny wrote: > Thank you for your fast reply and bug fix. I will test this tonight. > > Cheers, > > Julien. > > On Tue, Sep 28, 2010 at 6:46 PM, Michael Bayer <mike...@zzzcomputing.com> > wrote: >> this is a bug, ticket #1930, fixed in r36755ba72782. Note that a similar >> issue exists for joined table inheritance, and a scheme like the below will >> continue to fail if __tablename__ is added to subclasses (this is ticket >> #1931). The specific "scheme" is that the attribute name of the column in >> the mixin does not match the column name itself. >> >> http://www.sqlalchemy.org/trac/ticket/1930 >> http://www.sqlalchemy.org/trac/ticket/1931 >> >> >> >> On Sep 28, 2010, at 12:06 PM, Julien Iguchi-Cartigny wrote: >> >>> Hello Michael, >>> >>> Sorry I missing something but still trap in this problem. >>> >>> As far as I am: >>> >>> class AbstractContainer(Base,AbstractNamed): >>> __tablename__ = 'CM_MEMBER_CONTAINER_T' >>> id = Column('MEMBER_CONTAINER_ID',Integer,primary_key=True) >>> discriminator = Column('CLASS_DISCR', String(100)) >>> __mapper_args__ = {'polymorphic_on': discriminator } >>> >>> class CourseSet(AbstractContainer): >>> >>> @classproperty >>> def __mapper_args__(self): >>> args = dict() >>> args.update(AbstractContainer.__mapper_args__) >>> args.update({'polymorphic_identity': >>> 'org.sakaiproject.coursemanagement.impl.CourseSetCmImpl'}) >>> return args >>> >>> The inheritance pass is : Course <- AbstractContainer <- AbstractNamed >>> <- AbstractPersistence (see my first email for the definitions of the >>> last two classes). >>> >>> Still having some trouble: >>> >>> sqlalchemy.exc.ArgumentError: Column 'VERSION' on class <class >>> '__main__.CourseSet'> conflicts with existing column >>> 'CM_MEMBER_CONTAINER_T.VERSION' >>> >>> It I understand correctly, AbstractContainer has already mapped all >>> columns declared in parent classes. So CourseSet tries to remap >>> everything (it herits from Base) but it fails because all column are >>> already mapped. >>> >>> So I must say something like "hey, let just reuse mapping and table >>> definitions from AbstractContainer" but how can i do this ? >>> >>> It seems it is very simple from the POV of the documentation, so I >>> must deduce the problem comes from the multiple inheritance. >>> >>> Cheers, >>> >>> Julien. >>> >>> PS: This is the full listing of my code: >>> >>> from sqlalchemy import create_engine, Column, String, Date, Integer >>> from sqlalchemy.orm import sessionmaker >>> from sqlalchemy.ext.declarative import declarative_base >>> from sqlalchemy.ext.declarative import has_inherited_table >>> from sqlalchemy.util import classproperty >>> >>> engine = create_engine( >>> 'mysql://xxx:y...@localhost:3306/zzz?charset=utf8&use_unicode=0', >>> pool_recycle=3600, echo=True) >>> >>> Base = declarative_base() >>> >>> class AbstractPersistent(object): >>> version = Column('VERSION', Integer) >>> last_modified_by = Column('LAST_MODIFIED_BY', String(255)) >>> last_modified_date = Column('LAST_MODIFIED_DATE', Date) >>> created_by = Column('CREATED_BY', String(255)) >>> created_date = Column('CREATED_DATE', Date) >>> >>> def __repr__(self): >>> return "<AbstractPersistent('%s','%s', '%s','%s','%s')>" % \ >>> (self.version, self.last_modified_by, >>> self.last_modified_date, >>> self.created_by, self.created_date) >>> >>> class AbstractNamed(AbstractPersistent): >>> eid = Column('ENTERPRISE_ID', String(255)) >>> title = Column('TITLE', String(255)) >>> description = Column('DESCRIPTION', String(255)) >>> >>> def __repr__(self): >>> return "<AbstractNamed('%s','%s', '%s')>" % \ >>> (self.eid, self.title, self.description) + \ >>> super(AbstractNamed, self).__repr__() >>> >>> class AbstractContainer(Base,AbstractNamed): >>> __tablename__ = 'CM_MEMBER_CONTAINER_T' >>> id = Column('MEMBER_CONTAINER_ID',Integer,primary_key=True) >>> discriminator = Column('CLASS_DISCR', String(100)) >>> __mapper_args__ = {'polymorphic_on': discriminator } >>> >>> class AcademicSession(Base,AbstractNamed): >>> __tablename__ = 'CM_ACADEMIC_SESSION_T' >>> id = Column('ACADEMIC_SESSION_ID',Integer,primary_key=True) >>> start_date = Column('START_DATE', Date) >>> end_date = Column('END_DATE', Date) >>> >>> def __repr__(self): >>> return "<AcademicSession('%s','%s', '%s')>" % \ >>> (self.id, self.start_date, self.end_date) + \ >>> super(AcademicSession, self).__repr__() >>> >>> class CourseSet(AbstractContainer): >>> >>> @classproperty >>> def __mapper_args__(self): >>> args = dict() >>> args.update(AbstractContainer.__mapper_args__) >>> args.update({'polymorphic_identity': >>> 'org.sakaiproject.coursemanagement.impl.CourseSetCmImpl'}) >>> return args >>> >>> if __name__ == "__main__": >>> Session = sessionmaker(bind=engine) >>> session = Session() >>> academic_sessions = session.query(AcademicSession).all() >>> print(academic_sessions) >>> course_sets = session.query(CourseSet).all() >>> print(course_sets) >>> >>> >>> >>> On 27 sep, 23:55, Michael Bayer <mike...@zzzcomputing.com> wrote: >>>> On Sep 27, 2010, at 5:10 PM, Julien Iguchi-Cartigny wrote: >>>> >>>>> But How can i do ? It seems i need to define the table in >>>>> AsbtractContainer but every time I've an error about already defined >>>>> column. >>>> Your original setup seems as though you'd like both CourseSet and >>>> CanonicalCourse to be mapped to the same table using single table >>>> inheritance. Therefore they both must extend a class that is mapped to >>>> the target table. So in this case you'd like AbstractContainer to be >>>> mapped, meaning the "Base" superclass should be moved from CourseSet and >>>> CanonicalCourse onto AbstractContainer. >>>> >>>> You can then query for AbstractContainer subclasses using >>>> session.query(AbstractContainer). >>>> >>>> >>>> >>>> >>>> >>>>> Cheers, >>>>> Julien. >>>>> On Mon, Sep 27, 2010 at 10:30 PM, Michael Bayer >>>>> <mike...@zzzcomputing.com> wrote: >>>>>> On Sep 27, 2010, at 4:21 PM, Julien Iguchi-Cartigny wrote: >>>>>>> Thank you Michael. This solves the problem and... shows a new one. >>>>>>> So this is my update CourseSet >>>>>>> class CourseSet(Base,AbstractContainer): >>>>>>> @classproperty >>>>>>> def __mapper_args__(self): >>>>>>> args = dict() >>>>>>> args.update(AbstractContainer.__mapper_args__) >>>>>>> args.update({'polymorphic_identity': >>>>>>> 'org.sakaiproject.coursemanagement.impl.CourseSetCmImpl'}) >>>>>>> return args >>>>>>> Because there is several discriminant values, I need to create other >>>>>>> ones: >>>>>>> class CanonicalCourse(Base,AbstractContainer): >>>>>>> @classproperty >>>>>>> def __mapper_args__(self): >>>>>>> args = dict() >>>>>>> args.update(AbstractContainer.__mapper_args__) >>>>>>> args.update({'polymorphic_identity': >>>>>>> 'org.sakaiproject.coursemanagement.impl.CanonicalCourseCmImpl'}) >>>>>>> return args >>>>>>> But this last one will fail, i've the following error message: >>>>>>> sqlalchemy.exc.InvalidRequestError: Table 'CM_MEMBER_CONTAINER_T' is >>>>>>> already defined for this MetaData instance. Specify >>>>>>> 'useexisting=True' to redefine options and columns on an existing >>>>>>> Table object. >>>>>>> I could use useexisting=True but i don't know if it's the right >>>>>>> solution. Any ideas ? >>>>>> that has to do with a Table() statement, or alternatively how you are >>>>>> configuring __table_name__, neither of which are indicated here, so you >>>>>> need to ensure that distinct table names are used whenever a table name >>>>>> is declared. >>>>>>> Cheers, >>>>>>> Julien. >>>>>>> On Mon, Sep 27, 2010 at 1:02 AM, Michael Bayer >>>>>>> <mike...@zzzcomputing.com> wrote: >>>>>>>> On Sep 26, 2010, at 6:38 PM, Julien Iguchi-Cartigny wrote: >>>>>>>>> Hi, >>>>>>>>> I'm trying to use polymorphic_on with several inheritances: >>>>>>>>> engine = create_engine( >>>>>>>>> >>>>>>>>> 'mysql://xxx:y...@localhost:3306/zzz?charset=utf8&use_unicode=0', >>>>>>>>> pool_recycle=3600, echo=True) >>>>>>>>> Base = declarative_base() >>>>>>>>> class AbstractPersistent(object): >>>>>>>>> version = Column('VERSION', Integer) >>>>>>>>> last_modified_by = Column('LAST_MODIFIED_BY', String(255)) >>>>>>>>> last_modified_date = Column('LAST_MODIFIED_DATE', Date) >>>>>>>>> created_by = Column('CREATED_BY', String(255)) >>>>>>>>> created_date = Column('CREATED_DATE', Date) >>>>>>>>> class AbstractNamed(AbstractPersistent): >>>>>>>>> eid = Column('ENTERPRISE_ID', String(255)) >>>>>>>>> title = Column('TITLE', String(255)) >>>>>>>>> description = Column('DESCRIPTION', String(255)) >>>>>>>>> class AbstractContainer(AbstractNamed): >>>>>>>>> __tablename__ = 'CM_MEMBER_CONTAINER_T' >>>>>>>>> id = Column('MEMBER_CONTAINER_ID',Integer,primary_key=True) >>>>>>>>> discriminator = Column('CLASS_DISCR', String(100)) >>>>>>>>> __mapper_args__ = {'polymorphic_on': discriminator } >>>>>>>>> class CourseSet(Base,AbstractContainer): >>>>>>>>> __mapper_args__ = {'polymorphic_identity': >>>>>>>>> 'org.sakaiproject.coursemanagement.impl.CourseSetCmImpl'} >>>>>>>> AbstractContainer is not mapped, its a mixin, so its __mapper_args__ >>>>>>>> are not used until a subclass of Base is invoked, which starts up a >>>>>>>> declarative mapping. Your only mapped class then is CourseSet, which >>>>>>>> has its own __mapper_args__ , that override those of AbstractContainer >>>>>>>> - they are ignored. >>>>>>>> To combine __mapper_args__ from a mapped class with those of a mixin, >>>>>>>> see the example >>>>>>>> athttp://www.sqlalchemy.org/docs/orm/extensions/declarative.html?highli.... >>>>>>>> It uses __table_args__ but the same concept of creating a full >>>>>>>> dictionary of arguments applies for __mapper_args__ as well. >>>>>>>> -- >>>>>>>> You received this message because you are subscribed to the Google >>>>>>>> Groups "sqlalchemy" group. >>>>>>>> To post to this group, send email to sqlalch...@googlegroups.com. >>>>>>>> To unsubscribe from this group, send email to >>>>>>>> sqlalchemy+unsubscr...@googlegroups.com. >>>>>>>> For more options, visit this group >>>>>>>> athttp://groups.google.com/group/sqlalchemy?hl=en. >>>>>>> -- >>>>>>> "Trouble-a-cat limited" >>>>>>> -- >>>>>>> You received this message because you are subscribed to the Google >>>>>>> Groups "sqlalchemy" group. >>>>>>> To post to this group, send email to sqlalch...@googlegroups.com. >>>>>>> To unsubscribe from this group, send email to >>>>>>> sqlalchemy+unsubscr...@googlegroups.com. >>>>>>> For more options, visit this group >>>>>>> athttp://groups.google.com/group/sqlalchemy?hl=en. >>>>>> -- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "sqlalchemy" group. >>>>>> To post to this group, send email to sqlalch...@googlegroups.com. >>>>>> To unsubscribe from this group, send email to >>>>>> sqlalchemy+unsubscr...@googlegroups.com. >>>>>> For more options, visit this group >>>>>> athttp://groups.google.com/group/sqlalchemy?hl=en. >>>>> -- >>>>> "Trouble-a-cat limited" >>>>> -- >>>>> You received this message because you are subscribed to the Google Groups >>>>> "sqlalchemy" group. >>>>> To post to this group, send email to sqlalch...@googlegroups.com. >>>>> To unsubscribe from this group, send email to >>>>> sqlalchemy+unsubscr...@googlegroups.com. >>>>> For more options, visit this group >>>>> athttp://groups.google.com/group/sqlalchemy?hl=en. >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "sqlalchemy" group. >>> To post to this group, send email to sqlalch...@googlegroups.com. >>> To unsubscribe from this group, send email to >>> sqlalchemy+unsubscr...@googlegroups.com. >>> For more options, visit this group at >>> http://groups.google.com/group/sqlalchemy?hl=en. >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "sqlalchemy" group. >> To post to this group, send email to sqlalch...@googlegroups.com. >> To unsubscribe from this group, send email to >> sqlalchemy+unsubscr...@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/sqlalchemy?hl=en. >> >> > > -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. 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