Django Foreign Key - mysql

Question

I am trying to generate a report across 2 models/ tables. Here they are:
class Members(models.Model):
username = models.CharField(max_length=30,null=True, unique=True)
email = models.CharField(max_length=100,null=True, unique=True)
name = models.CharField(max_length=30,null=True)
phone = models.CharField(max_length=30,null=True)
and
class Report(models.Model):
report_text = models.CharField(max_length=500)
reporter_id = models.IntegerField(db_index=True)
reported_id = models.IntegerField(db_index=True)
date_created = models.DateTimeField(null=True)
date_read = models.DateTimeField(null=True)
The 2 tables obviously have auto increment IDs as the primary key.
The report will look like this:
Reported Phone | Reported Name | Report | Date Reported | Date Report Read
Everyone reported on will be in the member table. The reporter ID is the ID of the member who logged the report. The reported_id is the ID of the person the report is on. I need to do a join across the 2 models to get the members name and their phone number. I can't quite work it out form the doc. I believe I should make the reported_id and reporter_id both foreign keys to the Members table primary key ID field. How do I do that and what code will extract the report for all entries submitted by a specific reporter?
Do I user reported_id = models.ForeignKey(Members) and do the same for reporter_id. It seems odd as I don't specify the field that the field is foreign to. The ORM is supposed to make it easier (and it usually does!). I could do it with a join in SQL but this has got me stumped.
I hope the question makes sense.
Thanks in advance
Rich

Answer 1

How do I do that and what code will
extract the report for all entries
submitted by a specific reporter?
Yes, do reported_id = models.ForeignKey(Members)
The field will be the target models primary key, which is in your case id since you haven't specified one.
You will need to specify a related_name for one of these fields to prevent a name clash for the reverse foreign key accessor.
After setting up the foreign key field, to get all objects related via that foreign key, use the related_name to query the related model.
http://docs.djangoproject.com/en/dev/topics/db/queries/#following-relationships-backward
For example, if you set up your model as:
reporter = models.ForeignKey(Members, related_name="reports_by_me")
reported = models.ForeignKey(Members, related_name="reports_by_others")
You could access all related Report models via that foreign key by
member_instance.reports_by_me.all()
member_instance.reports_by_others.all()