Re: Proper approach to updating model object with 100 attributes.

On 6/29/10 4:20 PM, Ray Cote wrote:
> Hi Tim:
>
> Thanks for the pointers.
> I think the setattr is probably safest way to deal with the Django models.
>
> --Ray
>
> ----- Original Message -----
> From: "Tim Chase"<django.users@tim.thechases.com>
> To: django-users@googlegroups.com
> Cc: "Ray Cote"<rgacote@appropriatesolutions.com>
> Sent: Tuesday, June 29, 2010 2:03:05 PM GMT -05:00 US/Canada Eastern
> Subject: Re: Proper approach to updating model object with 100 attributes.
>
> On 06/29/2010 12:01 PM, Ray Cote wrote:
>
>> Hi List:
>>
>> I have a Django model with over 100 fields in it that is loaded from a data feed.
>> Each row in the model has a unique field, let's call it item_id.
>> When loading new data, I'm first checking to see if item_id is in the table,
>> if it is, I want to update it with the new data from the new 100 fields.
>>
>> To date, I've done things like:
>>
>> obj = Model.objects.get(item_id = item_id_from_field)
>>
>> and then.
>> obj.field1 = new_field1
>> etc.
>>
>> However, for 100 fields, I'd like to find something a bit cleaner than listing 100 fieldnames.
>> The data for the new 100 fields is in a nice dictionary.
>>
>> When I create a new item, I'm able to do this:
>> obj = MyModel(**dictionary_of_field_values)
>>
>> Is there something similar I can do with my obj once the data is retrieved?
>>
> Well, you could do something like
>
> for name, value in dictionary_of_field_values.items():
> setattr(obj, name, value)
>
> or possibly even just
>
> obj.__dict__.update(dictionary_of_field_values)
>
> (I'm not sure how this interacts with Django's meta-class
> yumminess, but it works for regular Python classes)
>
> -tkc
>
>
>
>
>
Perhaps you could use django.forms.models.model_to_dict() method? that
is if you have existing object already and you need to retrieve it's
attributes into a nice dict.
PS. If I misunderstood your question, disregard everything i wrote and
do accept my apologies :)

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