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Call sum on the scope directly, rather than relying on method_missing…

… and calculate
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1 parent ca77858 commit 140b269fb7aee85e6da32da5305f771099d35af5 @jonleighton jonleighton committed Jan 24, 2011
Showing with 2 additions and 2 deletions.
  1. +2 −2 activerecord/lib/active_record/associations/association_collection.rb
4 activerecord/lib/active_record/associations/association_collection.rb
@@ -125,9 +125,9 @@ def destroy_all
# Calculate sum using SQL, not Enumerable
def sum(*args)
if block_given?
- calculate(:sum, *args) { |*block_args| yield(*block_args) }
+ scoped.sum(*args) { |*block_args| yield(*block_args) }
Ruby on Rails member
pixeltrix added a note Aug 24, 2012

This line should've been:

load_target.sum(*args) { |*block_args| yield(*block_args) }

as ActiveRecord::Relation#sum will call to_a on the scope anyway so we don't save on loading the records and we have the additional overhead of creating the scope. Also it bypasses association specific behaviour like setting inverse instances on associations. :cry:

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- calculate(:sum, *args)
+ scoped.sum(*args)

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