require "stringio" 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 if ActiveRecord::Base.schema_format == :ruby. # Only strings are accepted if ActiveRecord::Base.schema_format == :sql. cattr_accessor :ignore_tables, default: [] class << self def dump(connection = ActiveRecord::Base.connection, stream = STDOUT, config = ActiveRecord::Base) new(connection, generate_options(config)).dump(stream) stream end private def generate_options(config) { table_name_prefix: config.table_name_prefix, table_name_suffix: config.table_name_suffix } end end def dump(stream) header(stream) extensions(stream) tables(stream) trailer(stream) stream end private def initialize(connection, options = {}) @connection = connection @version = Migrator::current_version rescue nil @options = options end # turns 20170404131909 into "2017_04_04_131909" def formatted_version stringified = @version.to_s return stringified unless stringified.length == 14 stringified.insert(4, "_").insert(7, "_").insert(10, "_") end def define_params @version ? "version: #{formatted_version}" : "" end def header(stream) 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 # Keep it for indexing materialized views def indexes(table, stream) if (indexes = @connection.indexes(table)).any? add_index_statements = indexes.map do |index| table_name = remove_prefix_and_suffix(index.table).inspect " add_index #{([table_name] + index_parts(index)).join(', ')}" end stream.puts add_index_statements.sort.join("\n") stream.puts end end def indexes_in_create(table, stream) if (indexes = @connection.indexes(table)).any? index_statements = indexes.map do |index| " t.index #{index_parts(index).join(', ')}" end stream.puts index_statements.sort.join("\n") end end def index_parts(index) index_parts = [ index.columns.inspect, "name: #{index.name.inspect}", ] index_parts << "unique: true" if index.unique index_parts << "length: { #{format_options(index.lengths)} }" if index.lengths.present? index_parts << "order: { #{format_options(index.orders)} }" if index.orders.present? index_parts << "where: #{index.where.inspect}" if index.where index_parts << "using: #{index.using.inspect}" if !@connection.default_index_type?(index) index_parts << "type: #{index.type.inspect}" if index.type index_parts << "comment: #{index.comment.inspect}" if index.comment index_parts end def foreign_keys(table, stream) if (foreign_keys = @connection.foreign_keys(table)).any? add_foreign_key_statements = foreign_keys.map do |foreign_key| parts = [ "add_foreign_key #{remove_prefix_and_suffix(foreign_key.from_table).inspect}", remove_prefix_and_suffix(foreign_key.to_table).inspect, ] if foreign_key.column != @connection.foreign_key_column_for(foreign_key.to_table) parts << "column: #{foreign_key.column.inspect}" end if foreign_key.custom_primary_key? parts << "primary_key: #{foreign_key.primary_key.inspect}" end if foreign_key.name !~ /^fk_rails_[0-9a-f]{10}$/ parts << "name: #{foreign_key.name.inspect}" end parts << "on_update: #{foreign_key.on_update.inspect}" if foreign_key.on_update parts << "on_delete: #{foreign_key.on_delete.inspect}" if foreign_key.on_delete " #{parts.join(', ')}" end stream.puts add_foreign_key_statements.sort.join("\n") end end def format_colspec(colspec) colspec.map { |key, value| "#{key}: #{value}" }.join(", ") end def format_options(options) options.map { |key, value| "#{key}: #{value.inspect}" }.join(", ") end def remove_prefix_and_suffix(table) table.gsub(/^(#{@options[:table_name_prefix]})(.+)(#{@options[:table_name_suffix]})$/, "\\2") end def ignored?(table_name) [ActiveRecord::Base.schema_migrations_table_name, ActiveRecord::Base.internal_metadata_table_name, ignore_tables].flatten.any? do |ignored| ignored === remove_prefix_and_suffix(table_name) end end end end