--- /dev/null
+require 'stringio'
+require 'bigdecimal'
+
+module ActiveRecord
+ # 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
+
+ # 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}" : ""
+
+ stream.puts <<HEADER
+# This file is auto-generated from the current state of the database. Instead of editing this file,
+# please use the migrations feature of Active Record to incrementally modify your database, and
+# then regenerate this schema definition.
+#
+# Note that this schema.rb definition is the authoritative source for your database schema. If you need
+# to create the application database on another system, you should be using db:schema:load, not running
+# all the migrations from scratch. The latter is a flawed and unsustainable approach (the more migrations
+# you'll amass, the slower it'll run and the greater likelihood for issues).
+#
+# It's strongly recommended to check this file into your version control system.
+
+ActiveRecord::Schema.define(#{define_params}) do
+
+HEADER
+ end
+
+ def trailer(stream)
+ stream.puts "end"
+ end
+
+ def tables(stream)
+ @connection.tables.sort.each do |tbl|
+ next if ['schema_migrations', ignore_tables].flatten.any? do |ignored|
+ case ignored
+ when String; tbl == ignored
+ when Regexp; tbl =~ ignored
+ else
+ raise StandardError, 'ActiveRecord::SchemaDumper.ignore_tables accepts an array of String and / or Regexp values.'
+ end
+ end
+ table(tbl, stream)
+ end
+ end
+
+ def table(table, stream)
+ columns = @connection.columns(table)
+ begin
+ tbl = StringIO.new
+
+ if @connection.respond_to?(:pk_and_sequence_for)
+ pk, pk_seq = @connection.pk_and_sequence_for(table)
+ end
+ pk ||= 'id'
+
+ tbl.print " create_table #{table.inspect}"
+ if columns.detect { |c| c.name == pk }
+ if pk != 'id'
+ tbl.print %Q(, :primary_key => "#{pk}")
+ end
+ else
+ tbl.print ", :id => false"
+ end
+ tbl.print ", :force => true"
+ tbl.puts " do |t|"
+
+ column_specs = columns.map do |column|
+ raise StandardError, "Unknown type '#{column.sql_type}' for column '#{column.name}'" if @types[column.type].nil?
+ next if column.name == pk
+ spec = {}
+ spec[:name] = column.name.inspect
+ spec[:type] = column.type.to_s
+ spec[:limit] = column.limit.inspect if column.limit != @types[column.type][:limit] && column.type != :decimal
+ spec[:precision] = column.precision.inspect if !column.precision.nil?
+ spec[:scale] = column.scale.inspect if !column.scale.nil?
+ spec[:null] = 'false' if !column.null
+ spec[:default] = default_string(column.default) if column.has_default?
+ (spec.keys - [:name, :type]).each{ |k| spec[k].insert(0, "#{k.inspect} => ")}
+ spec
+ end.compact
+
+ # find all migration keys used in this table
+ keys = [:name, :limit, :precision, :scale, :default, :null] & column_specs.map(&:keys).flatten
+
+ # figure out the lengths for each column based on above keys
+ lengths = keys.map{ |key| column_specs.map{ |spec| spec[key] ? spec[key].length + 2 : 0 }.max }
+
+ # the string we're going to sprintf our values against, with standardized column widths
+ format_string = lengths.map{ |len| "%-#{len}s" }
+
+ # find the max length for the 'type' column, which is special
+ type_length = column_specs.map{ |column| column[:type].length }.max
+
+ # add column type definition to our format string
+ format_string.unshift " t.%-#{type_length}s "
+
+ format_string *= ''
+
+ column_specs.each do |colspec|
+ values = keys.zip(lengths).map{ |key, len| colspec.key?(key) ? colspec[key] + ", " : " " * len }
+ values.unshift colspec[:type]
+ tbl.print((format_string % values).gsub(/,\s*$/, ''))
+ tbl.puts
+ end
+
+ tbl.puts " end"
+ tbl.puts
+
+ indexes(table, tbl)
+
+ tbl.rewind
+ stream.print tbl.read
+ rescue => 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|
+ statment_parts = [ ('add_index ' + index.table.inspect) ]
+ statment_parts << index.columns.inspect
+ statment_parts << (':name => ' + index.name.inspect)
+ statment_parts << ':unique => true' if index.unique
+
+ ' ' + statment_parts.join(', ')
+ end
+
+ stream.puts add_index_statements.sort.join("\n")
+ stream.puts
+ end
+ end
+ end
+end
\ No newline at end of file
projects / depot.git / blobdiff