diff options
| author | Paveł Tyślacki <pavel.tyslacki@gmail.com> | 2018-12-27 22:21:59 +0300 |
|---|---|---|
| committer | Tim Graham <timograham@gmail.com> | 2019-01-12 09:50:20 -0500 |
| commit | b69f8eb04cc8762d3dfd5af5ea1fc58e3f2ebcc3 (patch) | |
| tree | 6662b0cfe731e1912ff157ed46540be87cbec2bc /docs/ref | |
| parent | 1e837c4b2351c83b1c902314ddfdfa15c63bc60d (diff) | |
Fixed #30062 -- Added support for unique conditional constraints.
Diffstat (limited to 'docs/ref')
| -rw-r--r-- | docs/ref/models/constraints.txt | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/docs/ref/models/constraints.txt b/docs/ref/models/constraints.txt index c92d2dde37..acf3375b4a 100644 --- a/docs/ref/models/constraints.txt +++ b/docs/ref/models/constraints.txt @@ -69,3 +69,17 @@ date. .. attribute:: UniqueConstraint.name The name of the constraint. + +``condition`` +------------- + +.. attribute:: UniqueConstraint.condition + +A :class:`Q` object that specifies the condition you want the constraint to +enforce. + +For example, ``UniqueConstraint(fields=['user'], condition=Q(status='DRAFT')`` +ensures that each user only has one draft. + +These conditions have the same database restrictions as +:attr:`Index.condition`. |