Commits on Mar 28, 2017

1. Improve performance of Taxon promotion rule …

     1) Before #actionable? was bringing all product ids of the rule's taxons
        from the database. On a particular case in a store with 1mil
        products, the promotion was bringing 0.6mil of them, with a query ~ 5sec
        and 5mil ids in Ruby.
   
        After, the exists? query is a milliseconds one.
   
   
     2) Before #eligible? was fetching all parent taxons of each taxon on a
        product, which is not required for the match process.
   
        So, given an order with 10 line items, with each line item having a
        product with 3 taxons, each of them having 2 parent taxons
        would mean 30 queries to the db to fetch the ancestors, bringing a
        total of 60 taxons in Ruby memory.
   
        All of them unnecessary, as the matching processes can be done solely
        based on the rule's taxons, which if 5 would mean 5 queries to the DB
        (self_and_descendants)
   
   
     3) Fix incorrect test on #eligible?#all for taxon child of a taxon rule
        case.
   
        * there were no children tested in the case
   
   
     4) On #eligible?#all, take only the IDs from the DB to
        reduce memory overhead

   

   mtomov committed Mar 28, 2017
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