diff options
Diffstat (limited to 'docs/ref/models/fields.txt')
| -rw-r--r-- | docs/ref/models/fields.txt | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/docs/ref/models/fields.txt b/docs/ref/models/fields.txt index 2fad2d64b7..4acf47c188 100644 --- a/docs/ref/models/fields.txt +++ b/docs/ref/models/fields.txt @@ -1715,6 +1715,13 @@ that control how the relationship functions. .. note:: + If you don't want multiple associations between the same instances, add + a :class:`~django.db.models.UniqueConstraint` including the from and to + fields. Django's automatically generated many-to-many tables include + such a constraint. + + .. note:: + Recursive relationships using an intermediary model and defined as symmetrical (that is, with :attr:`symmetrical=True <ManyToManyField.symmetrical>`, which is the default) can't determine @@ -1746,7 +1753,9 @@ that control how the relationship functions. points (i.e. the target model instance). This class can be used to query associated records for a given model - instance like a normal model. + instance like a normal model:: + + Model.m2mfield.through.objects.all() .. attribute:: ManyToManyField.through_fields |