On Saturday, April 23, 2016 at 10:00:45 AM UTC-4:30, Bruce Whealton wrote:
>
> Hello all,
> So, I setup django in a virtualenv on my Ubuntu environment. I
> was reading the docs and thought I had things right
> for creating the 3 models I wanted with this application. I am using
> Postgresql. I have the Postgresql driver for Python/Django installed
> in the virtualenv. It is a "Contacts" app.
> First question: Do django model fields default to required unless you use
> blank=True, null=True?
> Many of my fields, I want to have optional.
>
> I have a class called Contact, a class called Organization and a class
> called Connection.
> I wanted to use the Organization as a foreign key on the Contact model. I
> could have more than one contact from
> an Organization. The Connection model is inspired by the Google Plus idea
> of "Circles" - e.g. friends,
> family, following, etc. So, this would be a many-to-many relationship.
>
> My problems are (1) I cannot create connections without specifying a
> contact.
> (2) If I was adding a contact using the admin interface, how do I allow no
> value for that foreign field
> or allow for some kind of ajax type of text completion? If a person is
> family or friend, I may not need
> to list an Organization for them.
> (3) I would like to support multiple connection types - e.g. following,
> employer, etc.
>
> So, here is my apps models.py file:
> >>>>
>
> from django.db import models
>
>
> class Contact(models.Model):
> name = models.CharField(max_length=40)
> Organization = models.CharField(max_length=50)
> street_line1 = models.CharField("Street Line 1", max_length=50)
> street_line2 = models.CharField("Street Line 2", max_length=50)
> city = models.CharField(max_length=40)
> state = models.CharField(max_length=40)
> zipcode = models.CharField(max_length=20, blank=True, null=True)
> phone1 = models.CharField(max_length=20)
> phone2 = models.CharField(max_length=20)
> email = models.EmailField(max_length=60)
>
>
> class Organization(models.Model):
> name = models.CharField(max_length=60)
> street_line1 = models.CharField("Street Line 1", max_length=50)
> street_line2 = models.CharField("Street Line 2", max_length=50)
> city = models.CharField(max_length=40)
> state = models.CharField(max_length=40)
> zipcode = models.CharField(max_length=20, blank=True, null=True,)
> phone = models.CharField(max_length=20)
> email = models.EmailField(max_length=60)
> website = models.URLField(max_length=90)
> contact_name = models.ForeignKey(Contact, on_delete=models.CASCADE)
>
>
> class Connection(models.Model):
> type = models.CharField(max_length=60)
> contact_name = models.ManyToManyField(Contact)
>
> >>>
> Thanks in advance for any suggestions,
> Bruce
>
Hi,
1. Do django model fields default to required unless you use blank=True,
null=True?
This may help you understand
that:
http://stackoverflow.com/questions/8609192/differentiate-null-true-blank-true-in-django
2. I think you need a foreign key on Contact to Organization:
class Contact(models.Model):
name = ....
....
organization = models.ForeignKey('Organization', null=True, blank=True)
That way you can have many contacts to a single organization. The
contact_name in Organizations allows only 1 Contact, but you said you need
many.
3. I cannot create connections without specifying a contact.
I don't see why not. Do you get any error?
4. If I was adding a contact using the admin interface, how do I allow no
value for that foreign field
By setting null=True, blank=True for the ForeignKey field. Notice Contact
do not have any ForeignKey in your example.
5. or allow for some kind of ajax type of text completion?
I have used this in the
past: https://django-autocomplete-light.readthedocs.org/en/master/
6. I would like to support multiple connection types - e.g. following,
employer, etc.
You already have a 'type' field in Connections model. First I suggest to
use a different name for the field: type is a reserved Python word.
Second, you can add choices to the field.
from django.utils.translation import ugettext as _
...
class Connection(models.Model):
CHOICES = (('follower', _('Follower')),
('employer', _('Employer')),
('unspecified', _('Unspecified')),
)
connection_type = models.CharField(max_length=20, choices=CHOICES)
contact_name = models.ManyToManyField(Contact)
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