Quick method to display the names of your PostgreSQL tables and their pkeys and sequences.

check_table_and_sequence_names.rb

def check_table_and_sequence_names
  connection = ActiveRecord::Base.connection
  if connection.adapter_name == "PostgreSQL"
    table_names = connection.tables.keep_if { |t| t !~ /schema_migrations/ }
    table_names.map { |t| [t, connection.pk_and_sequence_for(t)].flatten }
  end
end

check_table_and_sequence_names
# => [["tablename", "primarykeyname", "sequencename"]]