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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.default.nil?
(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)
indexes = @connection.indexes(table)
indexes.each do |index|
stream.print " add_index #{index.table.inspect}, #{index.columns.inspect}, :name => #{index.name.inspect}"
stream.print ", :unique => true" if index.unique
stream.puts
end
stream.puts unless indexes.empty?
end
end
end
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