ruby on rails - updating wrong value to database -


I'm just trying to increase the record starting in 1 in 2000, when a new record is created On click. Functions to create a record:

If resource_model == student then @ource.testing_id = id + 2000 end

So if the record has an ID of 1, then I think That would be test_id 2001. But instead 2147483647 (maximum mysql limit?)

How to find out if there is any suggestion? Thank you.

  1. You can not find the record id while creating the id after the recording of the database Knows.

  2. You can not relay the id to give values ​​like 1, 2, 3 ... and so on.

    3. You can get the next testing_id by something like this: 

      if resource_model == student then @ Resource.testing_id = Student.first (: order = & gt; "Test_id DESC"). Test_id + 1 end

    But if two processes get the same value at the same time, then you will have a duplicate test_id


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