here is the correct way to construct and append the constraint:
class Sites(Base):
__tablename__ = 'locations'
site_id = Column(Integer, primary_key=True)
site_name = Column(String(16), nullable=False)
data_type = Column(String(12), nullable=False)
source = Column(String(64))
lat = Column(String(9))
lon = Column(String(9))
stream = Column(String(32))
basin = Column(String(32))
comment = Column(String)
Sites.__table__.append_constraint(
CheckConstraint(Sites.data_type.in_(['Biogical', 'Chemical',
'Microbial', 'Physical', 'Multiple']))
)
On Sun, May 6, 2018 at 11:33 AM, Rich Shepard <rshep...@appl-ecosys.com> wrote:
> On Fri, 4 May 2018, Mike Bayer wrote:
>
>> you're looking for a table-level check constraint with IN:
>> table.append_constraint(
>> CheckConstraint(table.c.data_type.in_('A', 'B', 'C'))
>> )
>
>
> Mike,
>
> I'm missing how to properly use the above in my models.py module.
>
> For example:
>
> class Sites(Base):
> __tablename__ = 'locations'
>
> site_id = Column(Integer, primary_key=True)
> site_name = Column(String(16), nullable=False)
> data_type = Column(String(12), nullable=False)
> source = Column(String(64))
> lat = Column(String(9))
> lon = Column(String(9))
> stream = Column(String(32))
> basin = Column(String(32))
> comment = Column(String)
>
> locations.append.constraint(
> CheckConstraint(locations.data_type_in('Biogical', 'Chemical',
> 'Microbial', 'Physical', 'Multiple'))
> )
>
> Python shows me this error:
>
> Traceback (most recent call last):
> File "./openEDMS.py", line 18, in <module>
> import models
> File "/home/rshepard/development/openEDMS/models.py", line 20, in <module>
> class Sites(Base):
> File "/home/rshepard/development/openEDMS/models.py", line 37, in Sites
> CheckConstraint(locations.data_type_in('Biogical', 'Chemical',
> 'Microbial', 'Physical', 'Multiple'))
> NameError: name 'locations' is not defined
>
> If I change the table-level constraint from the tablename (locations) to
> the class name (Sites) python gives me the equivalent NameError. What syntax
> error have I made here?
>
> Regards,
>
>
> Rich
>
> --
> SQLAlchemy - The Python SQL Toolkit and Object Relational Mapper
>
> http://www.sqlalchemy.org/
>
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