On Mon, Mar 11, 2019 at 2:18 PM Rich Shepard <rshep...@appl-ecosys.com> wrote:
>
>
>
> > I'm not sure exactly what you mean here. You can write a function that
> > iterates over the rows and selects the attributes that you want.
>
> Simon,
>
> Let me try to be more clear.
>
> There's a database table named 'organizations', and an SA model class
> associated with it. One of the columns in the organization class, industry,
> is defined as:
>
> industry = Column(String, default='Other',
> ForeignKey('industries.ind_name', onupdate="CASCADE",
> ondelete="RESTRICT"))
>
> The industry classe is defined prior to the organization class:
>
> class Industries(Base):
> __tablename__ = 'industries'
>
> ind_name = Column(String, primary_key=True)
>
> When I query the database table using psql,
> select * from industries order by ind_name;
> psql displays this:
>
> ind_name
> -----------------
> Attorney
> Business
> Consultant
> Energy
> Farming
> Forest products
> Government
> Livestock
> Manufacturing
> Maritime
> Mining
> Other
> (12 rows)
>
> My assumption is that SA will return the same results. I want to present
> these names in the tkinter form for the organizations class within a
> ttk.Combobox by dropping the first two, and last, rows and making a list of
> the ind_name strings. There is another column in this class (and one in
> another class) where acceptable values for those variables are also in
> lookup tables.
>
> What is the most efficient way to do this? I thought that a function which
> ignores the first two rows then addes all but the last to a list would do
> the job so confirmation is helpful.
>
> If I'm still not explaining well enough I'll try again. :-)
>
> Regards,
>
> Rich
Using your Industries class, a function to return that list of names
could look like this:
def get_industry_names(session):
q = session.query(Industries)
return [i.ind_name for i in q.all()]
Does that do what you want?
Simon
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