And why do you use the doc property in
data = column_property(A.data, doc="B's data")
and why do you change A.data in class B?
On Fri, Jun 29, 2018 at 4:18 PM, Mike Bayer <mike...@zzzcomputing.com>
wrote:
> a Column is a Core schema construct that is not part of the ORM. The
> ORM maps a Column to your mapped class using a column_property() that
> wraps around it. When you use declarative_base, the declarative
> system is automatically generating these column_property() objects for
> each Column you have by itself.
>
> On Fri, Jun 29, 2018 at 4:16 PM, Marcus Mann <mitymar...@gmail.com> wrote:
> > I guess I am still a little confused about the relationship between
> Column
> > and column_property
> >
> > On Fri, Jun 29, 2018 at 4:14 PM, Mike Bayer <mike...@zzzcomputing.com>
> > wrote:
> >>
> >> On Fri, Jun 29, 2018 at 11:46 AM, Marcus Mann <mitymar...@gmail.com>
> >> wrote:
> >> > When I said description, I just meant a simple string that describes
> the
> >> > object, not a python docstring. Just an example column.
> >>
> >> so....does my example answer your question?
> >>
> >>
> >>
> >>
> >> >
> >> > On Friday, June 29, 2018 at 9:49:07 AM UTC-4, Mike Bayer wrote:
> >> >>
> >> >> your question is getting no answers because it is vague and doesn't
> >> >> provide any code. what's a "description"? you mean a Python
> >> >> docstring ? Python attributes don't have a __doc__ normally, if you
> >> >> mean the "doc" parameter, just make a separate property:
> >> >>
> >> >> class A(Base):
> >> >> __tablename__ = 'a'
> >> >>
> >> >> id = Column(Integer, primary_key=True)
> >> >>
> >> >> data = column_property(Column(String), doc="the data")
> >> >>
> >> >>
> >> >> class B(A):
> >> >> __tablename__ = 'b'
> >> >>
> >> >> id = Column(ForeignKey('a.id'), primary_key=True)
> >> >>
> >> >> data = column_property(A.data, doc="B's data")
> >> >>
> >> >>
> >> >>
> >> >>
> >> >> On Fri, Jun 29, 2018 at 8:41 AM, Marcus Mann <mitym...@gmail.com>
> >> >> wrote:
> >> >> >
> >> >> >
> >> >> > https://stackoverflow.com/questions/51046900/how-to-
> access-override-defaults-on-parents-attribute-in-sql-alchemy
> >> >> >
> >> >> > --
> >> >> > SQLAlchemy -
> >> >> > The Python SQL Toolkit and Object Relational Mapper
> >> >> >
> >> >> > http://www.sqlalchemy.org/
> >> >> >
> >> >> > To post example code, please provide an MCVE: Minimal, Complete,
> and
> >> >> > Verifiable Example. See http://stackoverflow.com/help/mcve for a
> full
> >> >> > description.
> >> >> > ---
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> >> >> > send
> >> >> > an
> >> >> > email to sqlalchemy+...@googlegroups.com.
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> >> >
> >> > --
> >> > SQLAlchemy -
> >> > The Python SQL Toolkit and Object Relational Mapper
> >> >
> >> > http://www.sqlalchemy.org/
> >> >
> >> > To post example code, please provide an MCVE: Minimal, Complete, and
> >> > Verifiable Example. See http://stackoverflow.com/help/mcve for a full
> >> > description.
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> >>
> >> --
> >> SQLAlchemy -
> >> The Python SQL Toolkit and Object Relational Mapper
> >>
> >> http://www.sqlalchemy.org/
> >>
> >> To post example code, please provide an MCVE: Minimal, Complete, and
> >> Verifiable Example. See http://stackoverflow.com/help/mcve for a full
> >> description.
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> >
> >
> > --
> > SQLAlchemy -
> > The Python SQL Toolkit and Object Relational Mapper
> >
> > http://www.sqlalchemy.org/
> >
> > To post example code, please provide an MCVE: Minimal, Complete, and
> > Verifiable Example. See http://stackoverflow.com/help/mcve for a full
> > description.
> > ---
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> --
> SQLAlchemy -
> The Python SQL Toolkit and Object Relational Mapper
>
> http://www.sqlalchemy.org/
>
> To post example code, please provide an MCVE: Minimal, Complete, and
> Verifiable Example. See http://stackoverflow.com/help/mcve for a full
> description.
> ---
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>
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
Example. See http://stackoverflow.com/help/mcve for a full description.
---
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