Rails - Nov 2012 - strange query like SELECT * FROM [Primary Key] = 0

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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