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petyosi/rails-306-slowdown.rb

Created April 8, 2011 08:44
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rails-306-slowdown.rb
A.count # ~ 2000
# in 3.0.4 this was very fast, although loading 2000k records - they had only one field loaded anyway.
# but in 3.0.6 this jumped from 1k ms to 15k ms.
A.includes(:b => :c).where('c.active').select('distinct field').map(&:field)
# fixed with something like that
A.joins(:b => :c).where('c.active').select('distinct field').map(&:field)
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