Rails重置所有Postgres序列？

Question

The following works in the Rails 3 console to reset Postgres sequences:

ActiveRecord::Base.connection.reset_pk_sequence!('menucontrols')
ActiveRecord::Base.connection.reset_pk_sequence!('statuscodes')
ActiveRecord::Base.connection.reset_pk_sequence!('wostatuses')
ActiveRecord::Base.connection.reset_pk_sequence!('taskstatuses')
ActiveRecord::Base.connection.reset_pk_sequence!('priorities')
ActiveRecord::Base.connection.reset_pk_sequence!('actcodes')

Is there a command that would reset ALL of them instead of having to do each one individually?

Thanks for the help!

Answer 1

This is easier

ActiveRecord::Base.connection.tables.each do |t|
  ActiveRecord::Base.connection.reset_pk_sequence!(t)
end

Answer 2

I found one way to do it from this posting: Reset PostgreSQL

I placed the following into seed.rb and ran rake db:seed

ActiveRecord::Base.connection.tables.each do |table|
  result = ActiveRecord::Base.connection.execute("SELECT id FROM #{table} ORDER BY id DESC LIMIT 1") rescue ( puts "Warning: not procesing table #{table}. Id is missing?" ; next )
  ai_val = result.any? ? result.first['id'].to_i + 1 : 1
  puts "Resetting auto increment ID for #{table} to #{ai_val}"
  ActiveRecord::Base.connection.execute("ALTER SEQUENCE #{table}_id_seq RESTART WITH #{ai_val}")
end