I'd like to remove all existing constraints from an ActiveRecord::Relation 
and leave the rest in-tact.

I am *not* looking for #unscoped since I would like to keep any joins/order 
clauses around.

Additionally, I would like to re-use the constraints that were removed in 
another query, so the ability to call #to_sql on them would be a very nice 
bonus.


This is the best I've been able to hack together:

Order.where(id: 1).where(id: 2).arel.constraints[0].to_sql

 => "`orders`.`id` = 1 AND `orders`.`id` = 2"

...but that just seems wrong.  As far as I can tell #constraints always has 
one item in it, but I don't know that will always be true.


Thanks!

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