AR changes to support creating ordered (asc, desc) indexes #3529
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jonleighton
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Nov 5, 2011
AR changes to support creating ordered (asc, desc) indexes
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Allows to have AR migrations that create indexes with specified per-column order (asc, desc) for some extra performance fine-tuning, e.g. http://stackoverflow.com/questions/743858/sql-server-indexes-ascending-or-descending-what-difference-does-it-make . Supported by most SQL databases.
add_index(:accounts, [:branch_id, :party_id], :order => {:branch_id => :desc, :part_id => :asc})
generates
CREATE INDEX by_branch_desc_party ON accounts(branch_id DESC, party_id ASC)
(this is to replace pull request 3351)