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Index: db/migrate/091_change_changesets_revision_to_string.rb

===================================================================

--- db/migrate/091_change_changesets_revision_to_string.rb	(revision 11125)

+++ db/migrate/091_change_changesets_revision_to_string.rb	(working copy)

@@ -1,6 +1,8 @@

 class ChangeChangesetsRevisionToString < ActiveRecord::Migration

   def self.up

-    remove_index  :changesets, :name => :changesets_repos_rev

+    if index_exists? :chengesets, :changesets_repos_rev

+    	remove_index  :changesets, :name => :changesets_repos_rev

+    end

     change_column :changesets, :revision, :string, :null => false

     add_index :changesets, [:repository_id, :revision], :unique => true, :name => :changesets_repos_rev

   end