> Le 24 mars 2017 à 02:00, Mark Mikofski <bwanama...@gmail.com> a écrit :
>
> Hi Xavier,
>
> Thanks for your quick reply. I had to rush off and I didn't get to finish the
> post. Sorry!
>
> Yes, I can make model objects and save them to the database using w =
> Weather(latitude=x, longitude=y, header="blah", datatype=3) and w.save().
There are slightly but significant differences between the .save() and
Weather.objects.create(..)
> The issue only occurs when I test the unique together constraint by posting a
> duplicate.
>
> If the serializer looks like this:
>
> class WeatherSerializer(serializers.ModelSerializer):
> """weather serializer"""
>
> class Meta:
> model = Weather
> exclude = ('lat_long',)
>
> then I can post new records fine. But if I try to post a duplicate that's
> when I get the integrity error, and since the validator is missing from the
> serializer, the server says 500.
The traceback would help understand what we are speaking about.
> If I remove the line `exclude = ('lat_long')` then the serializer _does_ have
> the `UniqueTogetherValidator` which I can see in a Django shell as
> WeatherSerializer().validators
>
> However, now if I try to post a duplicate, instead of getting 500, I do get
> 400, good, but the message is not "non_field_errors": ["The fields lat_long,
> header, datatype must make a unique set."], instead I get "lat_long": ["This
> field is required."]
>
> * I realize I should/could use DecimalField for latitude and longitude and
> that would resolve my problem.
> * I tried using HiddenField but couldn't get it to make the lat_long value
> without knowing the serializer object a priori
> * SerializerMethodField with get_lat_long(obj) method didn't work either
If you have a unique constraint on those fields, serializer will blow because
it enforces the check before saving meaning the field isn’t ready.
Exclude the field, remove the constraint and perform the check by yourself.
Regards,
Xavier Ordoquy,
Linovia.
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