Re: How to restrict True value to only one row in table column

Overriding save() is the best place to put that logic and it should work well with the admin also (other way is by means of signals) On Oct 18, 3:45 pm, Tomasz Zieliński wrote: > Maybe you can use something like this: > > http://stackoverflow.com/questions/1346765/unique-constraint-that-all... >

Re: How to restrict True value to only one row in table column

Maybe you can use something like this: http://stackoverflow.com/questions/1346765/unique-constraint-that-allows-empty-values-in-mysql This would probably mean converting is_master to: is_master = models.BooleanField(null=True, blank=True, unique=True) - and possibly overriding save to convert

How to restrict True value to only one row in table column

Hi all, Let's say I have a model like so: class Thing(models.Model): is_master = models.BooleanField() name = models.CharField() Now I want to be sure that only one Thing is_master at any given time. The rest of the Things must not be master and end users shouldn't be able to make a sen