Hi, everyone,

I am a beginner in ruby programming and I have a minor question about
data checking, if someone who could give me a suggestion that would be
great.

The system needs to prevent a duplicated record happened in database,
the record is consisted of two fields which are column A and column B.
Supposing a record has been saved in database that the A=1, B=1.
Afterward, the same set of record can not be accepted again, for
example, record: A=1, B=2 and A=2, B=1 both are acceptable. In other
words, record: A=1, B=1 can not be saved in database.

So how to check and prevent a new record that has the same columns with
same values tend to be saved in database?


Frank
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