Re: Is there a way to make a field both foreignKey or allow user to fill it in themself?

On 1/03/2018 3:20 PM, Matemática A3K wrote:
>
>
> On Wed, Feb 28, 2018 at 12:46 AM, Mike Dewhirst <miked@dewhirst.com.au
> <mailto:miked@dewhirst.com.au>> wrote:
>
> On 28/02/2018 1:58 PM, Alexander Joseph wrote:
>
> Sorry, I think my question was confusing. What I want to do is
> allow the user to either select a user from a drop down list
> of users from the ForeignKey in the Users model, or if there
> is not a user suitable to select in the drop down, they can
> manually type in a name themselves.
>
>
> In the same field that would require a hack of the first water. 
> Way above my pay grade. For me, anything which equates an existing
> user object with a string typed in is likely to end in misery.
>
> Otherwise a separate CharField for the typed in name and null=True
> and blank=True in the ForeignKey ought to work.
>
> Mike
>
>
> Indeed, what you can also do - besides the nullable FK, is process
> that in the Form where if the FK is null and the the charfield is not
> None, then create a User (maybe non active) with that name and assign
> it to the FK.

It will depend on the use-case requirements but I think that could get
slightly messy. You need to ensure you are not creating duplicate
people. For example you would likely need case-insensitive names.



>
>
> Thanks for your reply
>
>
>
> On Tuesday, February 27, 2018 at 7:45:51 PM UTC-7, Mike
> Dewhirst wrote:
>
>     On 28/02/2018 1:26 AM, Alexander Joseph wrote:
>     > Is there a way to make a form field or model field
> either a foreign
>     > key reference or allow the user to fill in something
> themselves?
>     I'm
>     > making a fixed assets app and each fixed asset has an
> owner field,
>     > which I would like to assign to an app user if possible,
> and if not
>     > possible be able to fill in a name myself.
>
>     Yes. Make the ForeignKey in the model null=True and
> blank=True so
>     it can
>     exist all alone. Then you can limit_choices_to whatever
> whatever
>     suits
>     your requirements ...
>
> https://docs.djangoproject.com/en/1.11/ref/models/fields/#django.db.models.ForeignKey.limit_choices_to
> <https://docs.djangoproject.com/en/1.11/ref/models/fields/#django.db.models.ForeignKey.limit_choices_to>
>    
> <https://docs.djangoproject.com/en/1.11/ref/models/fields/#django.db.models.ForeignKey.limit_choices_to
> <https://docs.djangoproject.com/en/1.11/ref/models/fields/#django.db.models.ForeignKey.limit_choices_to>>
>
>
>     hth
>     Mike
>
>
>     >
>     > Thanks
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