150 lines
4.9 KiB
Ruby
150 lines
4.9 KiB
Ruby
require 'stringio'
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require 'bigdecimal'
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module ActiveRecord
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# This class is used to dump the database schema for some connection to some
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# output format (i.e., ActiveRecord::Schema).
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class SchemaDumper #:nodoc:
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private_class_method :new
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# A list of tables which should not be dumped to the schema.
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# Acceptable values are strings as well as regexp.
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# This setting is only used if ActiveRecord::Base.schema_format == :ruby
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cattr_accessor :ignore_tables
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@@ignore_tables = []
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def self.dump(connection=ActiveRecord::Base.connection, stream=STDOUT)
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new(connection).dump(stream)
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stream
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end
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def dump(stream)
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header(stream)
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tables(stream)
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trailer(stream)
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stream
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end
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private
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def initialize(connection)
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@connection = connection
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@types = @connection.native_database_types
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@info = @connection.select_one("SELECT * FROM schema_info") rescue nil
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end
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def header(stream)
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define_params = @info ? ":version => #{@info['version']}" : ""
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stream.puts <<HEADER
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# This file is autogenerated. Instead of editing this file, please use the
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# migrations feature of ActiveRecord to incrementally modify your database, and
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# then regenerate this schema definition.
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ActiveRecord::Schema.define(#{define_params}) do
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HEADER
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end
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def trailer(stream)
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stream.puts "end"
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end
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def tables(stream)
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@connection.tables.sort.each do |tbl|
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next if ["schema_info", ignore_tables].flatten.any? do |ignored|
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case ignored
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when String: tbl == ignored
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when Regexp: tbl =~ ignored
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else
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raise StandardError, 'ActiveRecord::SchemaDumper.ignore_tables accepts an array of String and / or Regexp values.'
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end
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end
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table(tbl, stream)
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end
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end
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def table(table, stream)
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columns = @connection.columns(table)
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begin
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tbl = StringIO.new
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if @connection.respond_to?(:pk_and_sequence_for)
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pk, pk_seq = @connection.pk_and_sequence_for(table)
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end
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pk ||= 'id'
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tbl.print " create_table #{table.inspect}"
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if columns.detect { |c| c.name == pk }
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if pk != 'id'
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tbl.print %Q(, :primary_key => "#{pk}")
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end
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else
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tbl.print ", :id => false"
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end
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tbl.print ", :force => true"
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tbl.puts " do |t|"
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column_specs = columns.map do |column|
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raise StandardError, "Unknown type '#{column.sql_type}' for column '#{column.name}'" if @types[column.type].nil?
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next if column.name == pk
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spec = {}
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spec[:name] = column.name.inspect
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spec[:type] = column.type.inspect
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spec[:limit] = column.limit.inspect if column.limit != @types[column.type][:limit] && column.type != :decimal
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spec[:precision] = column.precision.inspect if !column.precision.nil?
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spec[:scale] = column.scale.inspect if !column.scale.nil?
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spec[:null] = 'false' if !column.null
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spec[:default] = default_string(column.default) if !column.default.nil?
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(spec.keys - [:name, :type]).each{ |k| spec[k].insert(0, "#{k.inspect} => ")}
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spec
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end.compact
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keys = [:name, :type, :limit, :precision, :scale, :default, :null] & column_specs.map{ |spec| spec.keys }.inject([]){ |a,b| a | b }
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lengths = keys.map{ |key| column_specs.map{ |spec| spec[key] ? spec[key].length + 2 : 0 }.max }
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format_string = lengths.map{ |len| "%-#{len}s" }.join("")
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column_specs.each do |colspec|
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values = keys.zip(lengths).map{ |key, len| colspec.key?(key) ? colspec[key] + ", " : " " * len }
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tbl.print " t.column "
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tbl.print((format_string % values).gsub(/,\s*$/, ''))
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tbl.puts
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end
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tbl.puts " end"
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tbl.puts
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indexes(table, tbl)
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tbl.rewind
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stream.print tbl.read
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rescue => e
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stream.puts "# Could not dump table #{table.inspect} because of following #{e.class}"
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stream.puts "# #{e.message}"
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stream.puts
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end
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stream
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end
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def default_string(value)
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case value
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when BigDecimal
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value.to_s
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when Date, DateTime, Time
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"'" + value.to_s(:db) + "'"
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else
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value.inspect
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end
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end
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def indexes(table, stream)
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indexes = @connection.indexes(table)
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indexes.each do |index|
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stream.print " add_index #{index.table.inspect}, #{index.columns.inspect}, :name => #{index.name.inspect}"
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stream.print ", :unique => true" if index.unique
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stream.puts
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end
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stream.puts unless indexes.empty?
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end
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end
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end
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