Tan Yi wrote: > Thanks for clarification. Sorry that I do not think I understand > circular dependency and compsite key very well. > > Also can you help me to read the circular dependency error message? I > mean How to find the circle from the error message of "Circular > Dependency". > Here is the error message: > > sqlalchemy.exc.CircularDependencyError: Circular dependency detected > [(DataValues, Groups), (DataValues, DerivedFrom), (Sites, > TexasStream), (Sites, DataValues), (Sites, ReservoirRatingCurve), > (Sites, Reservoir), (TexasStream, HydrologicUnit), (TexasStream, > MajorWaterRight), (TexasStream, Reservoir), (Reservoir, > MajorWaterRight), (Reservoir, ReservoirRatingCurve), (Reservoir, > StorageInformation), (MajorWaterRight, Reservoir), (HydrologicUnit, > Sites)][]
this kind of issue is addressed here: http://www.sqlalchemy.org/docs/mappers.html#rows-that-point-to-themselves-mutually-dependent-rows > > Thanks a lot... > > -- > 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.
