/usr/lib/ruby/vendor_ruby/sequel/extensions/schema_dumper.rb is in ruby-sequel 3.33.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# in a Sequel::Migration format, so they can be restored on another
# database (which can be the same type or a different type than
# the current database). The main interface is through
# Sequel::Database#dump_schema_migration.
module Sequel
class Database
# Dump indexes for all tables as a migration. This complements
# the :indexes=>false option to dump_schema_migration. Options:
# * :same_db - Create a dump for the same database type, so
# don't ignore errors if the index statements fail.
def dump_indexes_migration(options={})
ts = tables(options)
<<END_MIG
Sequel.migration do
up do
#{ts.sort_by{|t| t.to_s}.map{|t| dump_table_indexes(t, :add_index, options)}.reject{|x| x == ''}.join("\n\n").gsub(/^/o, ' ')}
end
down do
#{ts.sort_by{|t| t.to_s}.map{|t| dump_table_indexes(t, :drop_index, options)}.reject{|x| x == ''}.join("\n\n").gsub(/^/o, ' ')}
end
end
END_MIG
end
# Return a string that contains a Sequel::Migration subclass that when
# run would recreate the database structure. Options:
# * :same_db - Don't attempt to translate database types to ruby types.
# If this isn't set to true, all database types will be translated to
# ruby types, but there is no guarantee that the migration generated
# will yield the same type. Without this set, types that aren't
# recognized will be translated to a string-like type.
# * :indexes - If set to false, don't dump indexes (they can be added
# later via dump_index_migration).
def dump_schema_migration(options={})
ts = tables(options)
<<END_MIG
Sequel.migration do
up do
#{ts.sort_by{|t| t.to_s}.map{|t| dump_table_schema(t, options)}.join("\n\n").gsub(/^/o, ' ')}
end
down do
drop_table(#{ts.sort_by{|t| t.to_s}.inspect[1...-1]})
end
end
END_MIG
end
# Return a string with a create table block that will recreate the given
# table's schema. Takes the same options as dump_schema_migration.
def dump_table_schema(table, options={})
table = table.value.to_s if table.is_a?(SQL::Identifier)
raise(Error, "must provide table as a Symbol, String, or Sequel::SQL::Identifier") unless [String, Symbol].any?{|c| table.is_a?(c)}
s = schema(table).dup
pks = s.find_all{|x| x.last[:primary_key] == true}.map{|x| x.first}
options = options.merge(:single_pk=>true) if pks.length == 1
m = method(:column_schema_to_generator_opts)
im = method(:index_to_generator_opts)
begin
indexes = indexes(table).sort_by{|k,v| k.to_s} if options[:indexes] != false
rescue Sequel::NotImplemented
nil
end
gen = Schema::Generator.new(self) do
s.each{|name, info| send(*m.call(name, info, options))}
primary_key(pks) if !@primary_key && pks.length > 0
indexes.each{|iname, iopts| send(:index, iopts[:columns], im.call(table, iname, iopts))} if indexes
end
commands = [gen.dump_columns, gen.dump_constraints, gen.dump_indexes].reject{|x| x == ''}.join("\n\n")
"create_table(#{table.inspect}#{', :ignore_index_errors=>true' if !options[:same_db] && options[:indexes] != false && indexes && !indexes.empty?}) do\n#{commands.gsub(/^/o, ' ')}\nend"
end
private
# If a database default exists and can't be converted, return the string with the inspect
# method modified so that .lit is always appended after it, only if the
# :same_db option is used.
def column_schema_to_ruby_default_fallback(default, options)
if default.is_a?(String) && options[:same_db] && use_column_schema_to_ruby_default_fallback?
default = default.to_s
def default.inspect
"#{super}.lit"
end
default
end
end
# Convert the given name and parsed database schema into an array with a method
# name and arguments to it to pass to a Schema::Generator to recreate the column.
def column_schema_to_generator_opts(name, schema, options)
if options[:single_pk] && schema_autoincrementing_primary_key?(schema)
type_hash = options[:same_db] ? {:type=>schema[:db_type]} : column_schema_to_ruby_type(schema)
if type_hash == {:type=>Integer} || type_hash == {:type=>"integer"}
[:primary_key, name]
else
[:primary_key, name, type_hash]
end
else
col_opts = options[:same_db] ? {:type=>schema[:db_type]} : column_schema_to_ruby_type(schema)
type = col_opts.delete(:type)
col_opts.delete(:size) if col_opts[:size].nil?
col_opts[:default] = if schema[:ruby_default].nil?
column_schema_to_ruby_default_fallback(schema[:default], options)
else
schema[:ruby_default]
end
col_opts.delete(:default) if col_opts[:default].nil?
col_opts[:null] = false if schema[:allow_null] == false
[:column, name, type, col_opts]
end
end
# Convert the column schema information to a hash of column options, one of which must
# be :type. The other options added should modify that type (e.g. :size). If a
# database type is not recognized, return it as a String type.
def column_schema_to_ruby_type(schema)
case t = schema[:db_type].downcase
when /\A(?:medium|small)?int(?:eger)?(?:\((?:\d+)\))?(?: unsigned)?\z/o
{:type=>Integer}
when /\Atinyint(?:\((\d+)\))?\z/o
{:type =>schema[:type] == :boolean ? TrueClass : Integer}
when /\Abigint(?:\((?:\d+)\))?(?: unsigned)?\z/o
{:type=>Bignum}
when /\A(?:real|float|double(?: precision)?)\z/o
{:type=>Float}
when 'boolean'
{:type=>TrueClass}
when /\A(?:(?:tiny|medium|long|n)?text|clob)\z/o
{:type=>String, :text=>true}
when 'date'
{:type=>Date}
when /\A(?:small)?datetime\z/o
{:type=>DateTime}
when /\Atimestamp(?:\((\d+)\))?(?: with(?:out)? time zone)?\z/o
{:type=>DateTime, :size=>($1.to_i if $1)}
when /\Atime(?: with(?:out)? time zone)?\z/o
{:type=>Time, :only_time=>true}
when /\An?char(?:acter)?(?:\((\d+)\))?\z/o
{:type=>String, :size=>($1.to_i if $1), :fixed=>true}
when /\A(?:n?varchar|character varying|bpchar|string)(?:\((\d+)\))?\z/o
{:type=>String, :size=>($1.to_i if $1)}
when /\A(?:small)?money\z/o
{:type=>BigDecimal, :size=>[19,2]}
when /\A(?:decimal|numeric|number)(?:\((\d+)(?:,\s*(\d+))?\))?\z/o
s = [($1.to_i if $1), ($2.to_i if $2)].compact
{:type=>BigDecimal, :size=>(s.empty? ? nil : s)}
when /\A(?:bytea|(?:tiny|medium|long)?blob|(?:var)?binary)(?:\((\d+)\))?\z/o
{:type=>File, :size=>($1.to_i if $1)}
when 'year'
{:type=>Integer}
else
{:type=>String}
end
end
# Return a string that containing add_index/drop_index method calls for
# creating the index migration.
def dump_table_indexes(table, meth, options={})
return '' unless respond_to?(:indexes)
im = method(:index_to_generator_opts)
indexes = indexes(table).sort_by{|k,v| k.to_s}
gen = Schema::Generator.new(self) do
indexes.each{|iname, iopts| send(:index, iopts[:columns], im.call(table, iname, iopts))}
end
gen.dump_indexes(meth=>table, :ignore_errors=>!options[:same_db])
end
# Convert the parsed index information into options to the Generators index method.
def index_to_generator_opts(table, name, index_opts)
h = {}
h[:name] = name unless default_index_name(table, index_opts[:columns]) == name.to_s
h[:unique] = true if index_opts[:unique]
h
end
# Don't use the "...".lit fallback on MySQL, since the defaults it uses aren't
# valid literal SQL values.
def use_column_schema_to_ruby_default_fallback?
database_type != :mysql
end
end
module Schema
class Generator
# Dump this generator's columns to a string that could be evaled inside
# another instance to represent the same columns
def dump_columns
strings = []
cols = columns.dup
if pkn = primary_key_name
cols.delete_if{|x| x[:name] == pkn}
pk = @primary_key.dup
pkname = pk.delete(:name)
@db.serial_primary_key_options.each{|k,v| pk.delete(k) if v == pk[k]}
strings << "primary_key #{pkname.inspect}#{opts_inspect(pk)}"
end
cols.each do |c|
c = c.dup
name = c.delete(:name)
type = c.delete(:type)
opts = opts_inspect(c)
strings << if type.is_a?(Class)
"#{type.name} #{name.inspect}#{opts}"
else
"column #{name.inspect}, #{type.inspect}#{opts}"
end
end
strings.join("\n")
end
# Dump this generator's constraints to a string that could be evaled inside
# another instance to represent the same constraints
def dump_constraints
cs = constraints.map do |c|
c = c.dup
type = c.delete(:type)
case type
when :check
raise(Error, "can't dump check/constraint specified with Proc") if c[:check].is_a?(Proc)
name = c.delete(:name)
if !name and c[:check].length == 1 and c[:check].first.is_a?(Hash)
"check #{c[:check].first.inspect[1...-1]}"
else
"#{name ? "constraint #{name.inspect}," : 'check'} #{c[:check].map{|x| x.inspect}.join(', ')}"
end
else
cols = c.delete(:columns)
"#{type} #{cols.inspect}#{opts_inspect(c)}"
end
end
cs.join("\n")
end
# Dump this generator's indexes to a string that could be evaled inside
# another instance to represent the same indexes. Options:
# * :add_index - Use add_index instead of index, so the methods
# can be called outside of a generator but inside a migration.
# The value of this option should be the table name to use.
# * :drop_index - Same as add_index, but create drop_index statements.
# * :ignore_errors - Add the ignore_errors option to the outputted indexes
def dump_indexes(options={})
is = indexes.map do |c|
c = c.dup
cols = c.delete(:columns)
if table = options[:add_index] || options[:drop_index]
"#{options[:drop_index] ? 'drop' : 'add'}_index #{table.inspect}, #{cols.inspect}#{', :ignore_errors=>true' if options[:ignore_errors]}#{opts_inspect(c)}"
else
"index #{cols.inspect}#{opts_inspect(c)}"
end
end
is.join("\n")
end
private
def opts_inspect(opts)
if opts[:default]
opts = opts.dup
de = case d = opts.delete(:default)
when BigDecimal, Sequel::SQL::Blob
"#{d.class.name}.new(#{d.to_s.inspect})"
when DateTime, Date
"#{d.class.name}.parse(#{d.to_s.inspect})"
when Time
"#{d.class.name}.parse(#{d.strftime('%H:%M:%S').inspect})"
else
d.inspect
end
", :default=>#{de}#{", #{opts.inspect[1...-1]}" if opts.length > 0}"
else
", #{opts.inspect[1...-1]}" if opts.length > 0
end
end
end
end
end
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