Ticket #4214: db-api.patch

File db-api.patch, 749 bytes (added by david@…, 12 years ago)

patch that explains how to update a foreign key field

  • db-api.txt

     
    134134
    135135The ``save()`` method has no return value.
    136136
     137How to update a Foreign Key field
     138---------------------------------
     139
     140To update a foreign key field, assign a compatible database object to the field.
     141
     142Given a models.py contained this definition
     143
     144        class Blog(models.Model):
     145                ...
     146                owner = models.ForeignKey('Owner')
     147
     148This example would update ``Blog`` instance ``b5`` to point to "Jill" as the owner for the blog::
     149
     150        p = Owner.objects.create(name="Jill")
     151        b5.owner = p
     152        b5.save()
     153
    137154How Django knows to UPDATE vs. INSERT
    138155-------------------------------------
    139156
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