Rails 3: Validate combined values
- by Cimm
In Rails 2.x you can use validations to make sure you have a unique combined value like this:
validates_uniqueness_of :husband, :scope => :wife
In the corresponding migration it could look like this:
add_index :family, [:husband, :wife], :unique => true
This would make sure the husband/wife combination is unique in the database. Now, in Rails 3 the validation syntax changed and the scope attribute seems to be gone. It now looks like:
validates :husband, :presence => true
Any idea how I can achieve the combined validation in Rails 3? The Rails 2.x validations still work in Rails 3 so I can still use the first example but it looks so "old", are there better ways?
