On Monday 19 June 2017 04:00:42 Priyanka Thakur wrote:
> On Monday, 19 June 2017 16:05:06 UTC+5:30, m712 - Developer wrote:
> > Melvyn was not saying whether you were checking for None. If `value`
> > is i.e. "some string" your to_python method will return `None`. You
> > should do something like this:
> >
> > ```
> >
> > if value in ('t', ...): return True
> > elif value in ('f', ...): return False
> > else: return bool(value) # You can change this
> >
> > ```
That's correct for to_python. But personally, I would raise an exception in
from_db_value, since
that indicates data corruption.
In your case, there are only a handful of allowed values that should come from
the database.
Anything else, will indicate somebody messing with your data or upgrades of one
of the
libraries in between Django and the database changed it's output format. Both
of which will
require attention.
This is one advantage of from_db_value and to_python separation.
--
Melvyn Sopacua
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