require 'stringio' require 'active_support/core_ext/big_decimal' module ActiveRecord # = Active Record Schema Dumper # # This class is used to dump the database schema for some connection to some # output format (i.e., ActiveRecord::Schema). class SchemaDumper #:nodoc: private_class_method :new ## # :singleton-method: # A list of tables which should not be dumped to the schema. # Acceptable values are strings as well as regexp. # This setting is only used if ActiveRecord::Base.schema_format == :ruby cattr_accessor :ignore_tables @@ignore_tables = [] def self.dump(connection=ActiveRecord::Base.connection, stream=STDOUT) new(connection).dump(stream) stream end def dump(stream) header(stream) tables(stream) trailer(stream) stream end private def initialize(connection) @connection = connection @types = @connection.native_database_types @version = Migrator::current_version rescue nil end def header(stream) define_params = @version ? "version: #{@version}" : "" if stream.respond_to?(:external_encoding) && stream.external_encoding stream.puts "# encoding: #{stream.external_encoding.name}" end stream.puts <
e stream.puts "# Could not dump table #{table.inspect} because of following #{e.class}" stream.puts "# #{e.message}" stream.puts end stream end def default_string(value) case value when BigDecimal value.to_s when Date, DateTime, Time "'#{value.to_s(:db)}'" else value.inspect end end def indexes(table, stream) if (indexes = @connection.indexes(table)).any? add_index_statements = indexes.map do |index| statement_parts = [ ('add_index ' + remove_prefix_and_suffix(index.table).inspect), index.columns.inspect, ('name: ' + index.name.inspect), ] statement_parts << 'unique: true' if index.unique index_lengths = (index.lengths || []).compact statement_parts << ('length: ' + Hash[index.columns.zip(index.lengths)].inspect) unless index_lengths.empty? index_orders = (index.orders || {}) statement_parts << ('order: ' + index.orders.inspect) unless index_orders.empty? statement_parts << ('where: ' + index.where.inspect) if index.where ' ' + statement_parts.join(', ') end stream.puts add_index_statements.sort.join("\n") stream.puts end end def remove_prefix_and_suffix(table) table.gsub(/^(#{ActiveRecord::Base.table_name_prefix})(.+)(#{ActiveRecord::Base.table_name_suffix})$/, "\\2") end end end