how to intersect two associations in arel?

how to intersect two associations in arel?

References

Reference NO 1

http://stackoverflow.com/questions/15165768/how-to-intersect-two-associations-in-arel

Reference NO 2

http://stackoverflow.com/questions/6435389/intersection-of-two-relations

Reference NO 3

http://stackoverflow.com/questions/16541187/cannot-programmatically-combine-and-and-or-conditions-using-arel

Reference NO 4

http://stackoverflow.com/questions/15789145/how-to-join-on-subqueries-using-arel

Reference NO 5

https://github.com/rails/arel

Reference NO 6

#EANF#

Reference NO 7

#EANF#

Reference NO 8

#EANF#