[Rails] how to give the condition between Id field and name field

Hi,
Am having a table with quetion_id , nominees and vote_count. In which
the values for question_id and nominees are prepopulated from other
tables with vote_count as zero.

If the users select some nominees the vote count should be incresed by
one. The problem is How to connect the question_id and nominees like for
this question_id this nominee is selected .

can some one give example for this situation..
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