I have a database table that will be empty now and later will have rows
in it.
Once I have rows, I want to create a SingleSelectWidget that allows
users to choose rows.
In the mean time, if the database table is empty, I don't want to
display the select form in my template.
I wrote this goofy function that either returns a select widget, or
None, depending on if the underlying table is empty:
def mk_select(t, c, widgetname):
"""
Return None or a select widget that uses table ID for value.
t is table.
c is column to be used for the label.
"""
rows = t.select()
if rows.count() > 0:
s = widgets.SingleSelectField(widgetname,
options=[(x.id, getattr(x, c))
for x in rows])
else: s = None
return s
carriers=mk_select(model.Carrier, 'carriername', 'carrier')
Then in my template, I do this:
<tr
py:if="carriers"><td>Carrier</td><td>${carriers.display()}</td></tr>
This strikes me as really ugly.
What am I doing wrong?
Matt
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