The uniqueness for a field

Rails
1

Rails 3.1.3

Say, I have tables, Video and Script. Their association is

Video:1 — n:Script

Also, Script has a field called ‘value’, (which is decimal, but the type
is not important here).

I want every ‘value’ to be unique for EACH Video. In other words,

Video1 : script-value=1, script-value=2, script-value=4 …

is OK. But NOT

Video1 : script-value=2, script-value=2, script-value=4 …

If I set ‘:value, uniqueness => true’ in Script.rb, a critical problem
occurs.
script-value s are unique for EACH Video, but they are not for all
Videos.

Video1 : script-value:1, script-value:2, script-value:4 …
Video2 : script-value:1, script-value:7, script-value:9 …
…

Video1 and Video2 has the same script-values (=1), from which
‘uniqueness => true’ setting prevents.

Is there anyway to allow Videos to have the same 'value’s, which however
are distinct from each other among the values that a single Video
possesses?

soichi

2

Thanks!

validates :value, :uniqueness => { :scope => :video_id }

solves the problem.

soichi

3

On 18 March 2012 10:52, Soichi I. [email protected] wrote:

Is there anyway to allow Videos to have the same 'value’s, which however
are distinct from each other among the values that a single Video
possesses?

GIYF: