[Rails] custom query to db

Hi all,
I have problem regarding querying database in rails database.
Senerio:
There are 2 models 'user' and 'interests'
Association between them is has_and_belongs_to_many

Now If I want to list common interests between two users. How do I query
db.
I think, we have to write custom plsql statement.
Can I know your thoughts.

Thank you,
Aashish

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