class PactBroker::DB::DataMigrations::SetLatestVersionSequenceValue

Public Class Methods

call(connection) click to toggle source
# File lib/pact_broker/db/data_migrations/set_latest_version_sequence_value.rb, line 7
def self.call connection
  if columns_exist?(connection)
    max_order = connection[:versions].max(:order) || 0
    sequence_row = connection[:version_sequence_number].first
    if sequence_row.nil? || sequence_row[:value] <= max_order
      new_value = max_order + 100
      connection[:version_sequence_number].insert(value: new_value)
      # Make sure there is only ever one row in case there is a race condition
      connection[:version_sequence_number].exclude(value: new_value).delete
    end
  end
end
column_exists?(connection, table, column) click to toggle source
# File lib/pact_broker/db/data_migrations/set_latest_version_sequence_value.rb, line 25
def self.column_exists?(connection, table, column)
  connection.table_exists?(table) && connection.schema(table).find{|col| col.first == column }
end
columns_exist?(connection) click to toggle source
# File lib/pact_broker/db/data_migrations/set_latest_version_sequence_value.rb, line 20
def self.columns_exist?(connection)
  column_exists?(connection, :versions, :order) &&
    column_exists?(connection, :version_sequence_number, :value)
end