On Behalf Of Chirag Mistry:
# only want a list which contains modules M1 and M2 for MyClass. If we
# call ¡ÈMyClass.ancestors¡É which returns all the modules which 
# are include directly or indirectly in this class and all parent class 

how about subtracting fr there =)

something like, 

irb(main):026:0> C2.ancestors - (Class.new.ancestors + [C2])
=> [M2, M1]

sorry if my answer sound stupid. 

kind regards -botp