Hi Melvyn,
Finally i had breakthrough and saw the root cause.
The issue is that i haven't defined any default value for this Custom field
in the model class.
As per Django 1.10 documentation, the default value of Boolean Field is
None if "default" value is not defined. Hence "None" value.
Though surprising thing is , that when data is getting inserted , it's
invoking proper custom field methods and inserting the value "0", but once
the object is saved i.e. serializer.save () , the instance returned is
containing the value "None" which it is getting from "to_representation "
method.
Regards,
Priyanka
On Monday, 19 June 2017 22:51:44 UTC+5:30, Melvyn Sopacua wrote:
>
> 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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