Ruby on Rails

I am use ROR v= 2.3.4

in my console.  i found a strange query SELECT * FROM [Primary Key(id)] = 0,
because of i had changed the id[Primary Key] from int to varchar. ruby on rails still query the db on int like 0 use int not '0'.
such kind query cost too much db resource. and i don't konw how to prevent such query.

please help.

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