method
copy_table_indexes
v3.2.8 -
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Class: ActiveRecord::ConnectionAdapters::SQLiteAdapter
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copy_table_indexes(from, to, rename = {})
protected
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# File activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb, line 517 def copy_table_indexes(from, to, rename = {}) #:nodoc: indexes(from).each do |index| name = index.name if to == "altered_#{from}" name = "temp_#{name}" elsif from == "altered_#{to}" name = name[5..-1] end to_column_names = columns(to).map { |c| c.name } columns = index.columns.map {|c| rename[c] || c }.select do |column| to_column_names.include?(column) end unless columns.empty? # index name can't be the same opts = { :name => name.gsub(/_(#{from})_/, "_#{to}_") } opts[:unique] = true if index.unique add_index(to, columns, opts) end end end