Access fields in Django intermediate model
django, model
Solution
The members field in your example is a ManyToManyField, so it's a way to access many people rather than one person. The object that is under the members field is actually a special type of Manager, not a Person:
>>> print my_group.members
<django.db.models.fields.related.ManyRelatedManager object at 0x181f7d0>
To understand better what a Manager is, see the documentation.
To access a person's name you would do for example:
>>> for person in my_group.members.all():
>>> print person.name
You cannot access the fields in your Membership model via the Manager in the members field. To access any of the fields in it you would do:
>>> for membership in my_group.membership_set.all():
>>> print membership.date_joined
And so if you had a field called name in your Membership model, you would access it like this:
>>> for membership in my_group.membership_set.all():
>>> print membership.name
A second way to access a Person's name would be:
>>> for membership in my_group.membership_set.all():
>>> print membership.person.name
Note that `membership_set` is a default name for the manager pointing towards the membership, but it can be changed by specifying `related_name` in the corresponding foreign key. For example if the foreign key from the `Membership` to the `Group` would be defined like such:
group = models.ForeignKey(Group, related_name="group_members")
Then you would access the manager using `group_members`:
>>> for membership in my_group.group_members.all():
>>> print membership.name
Hope that helps a little :)
Problem
I'm creating a Person Group and Membership as described in Django docs for intermediate model. ``` class Person(models.Model): name = models.CharField(max_length=128) def __unicode__(self): return self.name class Group(models.Model): name = models.CharField(max_length=128) members = models.ManyToManyField(Person, through='Membership') def __unicode__(self): return self.name class Membership(models.Model): person = models.ForeignKey(Person) group = models.ForeignKey(Group) date_joined = models.DateField() invite_reason = models.CharField(max_length=64) ``` It is possible to access the Person from a Group object with: ``` >>>Group.members.name ``` Does Django creates another query to fetch the Person? Can I access the `date_joined` field from a Group object? The thing that confuses me is that I would expect to get the Person name field with: ``` >>>Group.members.person.name ``` What happens if a Person has a field 'name' and also the intermediate model have a field 'name'.