On 11-11-19 03:15 PM, Matt Jones wrote:
On Nov 19, 2011, at 2:19 PM, Donald R. Ziesig wrote:
Hi All!
I thought I saw the solution to this problem a long time ago, but I can't seem
to find it now.
I have a table of Properties with belongs_to Agents. I want to restrict the
uniqueness of the property's name only to a specific Agent such that Agent1 had
Properties A, B and C and Agent2 adds a property B - right now that is rejected
as being a duplicate, but it shouldn't fail. I can do this with a bit of
hacking, but there should be an easy way to do it.
in the Agents model:
fields do
name :string, :unique, :required
*
*
end
has_many :properties
in the Properties model:
fields do
name :string, :unique, :required #I should be able to add something here
I think.
*
*
end
belongs to :agent
What am I missing here?
The :unique option in the field declaration is a shortcut - it doesn't accept
all the options that the underlying Rails validation does. If you remove it and
write out the full validation (on Property):
validates_uniqueness_of :name, :scope => :agent_id
BTW, the new Rails 3 (Hobo 1.3) way of doing this is:
validates :name, :uniqueness => {:scope => :agent_id}
The advantage of this format it that you can put all the validations for
a field into the same directive.
Cheers,
Henry
it should do exactly what you're describing.
--Matt Jones
--
Henry Baragar
Instantiated Software
416-907-8454 x42
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