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class ChangeChangesetsRevisionToString < ActiveRecord::Migration[4.2]
def self.up
# 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
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
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