Quick validation question

Rails
1

Hi, I have a model which contains a boolean value. I would like to set
a validation which only allows this value to be set to true for one
record at a time in the table. Is it possible to do this with
validates_uniqueness? or is there another way?

Any help would be appreciated, thanks.

2

Is it possible to do this with

validates_uniqueness?

validates_uniqueness on a boolean would be great if you only ever want 2
records in your table…

Perhaps doing a quick count of records with the value set before saving
your current create/update would achieve what you want.

3

Dan S. wrote:

Hi, I have a model which contains a boolean value. I would like to set
a validation which only allows this value to be set to true for one
record at a time in the table. Is it possible to do this with
validates_uniqueness? or is there another way?

validates_uniqueness_of :is_root, :if => :is_root should work.

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