Hello,
I asked this question on Reddit and StackOverflow without any luck getting
an answer. Here is the StackOverflow question
<https://stackoverflow.com/questions/45599453/set-up-a-composite-key-using-a-foreign-key-and-another-column-with-python-sqlalc>.
I'll paste it below again.
I have two tables set up in Python with sqlalchemy using mySQL. They look
something like this:
from sqlalchemy import *
from sqlalchemy.orm import *
from sqlalchemy.ext.declarative import declarative_base
class Test(Base):
__tablename__ = 'test'
id = Column(Integer, primary_key=True)
questions = relationship('Question', cascade='all,delete', backref=
'test', uselist=True)
class Question(Base):
__tablename__ = 'question'
testID = Column(Integer, ForeignKey('test.id', ondelete='CASCADE'))
sequence = Column(Integer, primary_key=True)
text = Column(String(500))
Right now when I run my code and get the tables set up, they look like this:
testID|sequence|text
1 | 1 | text
1 | 2 | text
1 | 3 | text
1 | 4 | text
2 | 5 | text
2 | 6 | text
2 | 7 | text
But I want them to look like this:
testID|sequence|text
1 | 1 | text
1 | 2 | text
1 | 3 | text
1 | 4 | text
2 | 1 | text
2 | 2 | text
2 | 3 | text
I know that sequence is auto-incrementing because it is the first int
primary key, but I only want it to auto-increment until there's a new
testID.
I *could* leave it and just sort them later, but I'd really like to set it
up where sequence resets with every new testID. I'm pretty new to
sqlAlchemy so I may be missing something obvious. Any help is appreciated.
Thanks.
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
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