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Check if index exists before removing it (#12713). 

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11137 e93f8b46-1217-0410-a6f0-8f06a7374b81
This commit is contained in:
Jean-Philippe Lang 2013-01-06 14:46:51 +00:00
parent 98c8212d71
commit cc47ccb1c2
1 changed files with 21 additions and 2 deletions
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23
db/migrate/091_change_changesets_revision_to_string.rb
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@ -1,13 +1,32 @@
class ChangeChangesetsRevisionToString < ActiveRecord::Migration
def self.up
remove_index :changesets, :name => :changesets_repos_rev
# Some backends (eg. SQLServer 2012) do not support changing the type
# of an indexed column so the index needs to be dropped first
# BUT this index is renamed with some backends (at least SQLite3) for
# some (unknown) reasons, thus we check for the other name as well
# so we don't end up with 2 identical indexes
if index_exists? :changesets, [:repository_id, :revision], :name => :changesets_repos_rev
remove_index :changesets, :name => :changesets_repos_rev
end
if index_exists? :changesets, [:repository_id, :revision], :name => :altered_changesets_repos_rev
remove_index :changesets, :name => :altered_changesets_repos_rev
end
change_column :changesets, :revision, :string, :null => false
add_index :changesets, [:repository_id, :revision], :unique => true, :name => :changesets_repos_rev
end
def self.down
remove_index :changesets, :name => :changesets_repos_rev
if index_exists? :changesets, :changesets_repos_rev
remove_index :changesets, :name => :changesets_repos_rev
end
if index_exists? :changesets, [:repository_id, :revision], :name => :altered_changesets_repos_rev
remove_index :changesets, :name => :altered_changesets_repos_rev
end
change_column :changesets, :revision, :integer, :null => false
add_index :changesets, [:repository_id, :revision], :unique => true, :name => :changesets_repos_rev
end
end