Class: Miguel::Migrator

Inherits:
Object
  • Object
show all
Defined in:
lib/miguel/migrator.rb

Overview

Class for generating database migration from one schema to another.

Instance Method Summary collapse

Instance Method Details

#change_migration(from, to, out = Dumper.new) ⇒ Object

Generate one way Sequel migration.



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# File 'lib/miguel/migrator.rb', line 221

def change_migration( from, to, out = Dumper.new )
  out.dump "Sequel.migration" do
    out.dump "change" do
      changes( from, to, out )
    end
  end
end

#changes(from, to, out = Dumper.new) ⇒ Object

Generate code for changing one schema to another.



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# File 'lib/miguel/migrator.rb', line 194

def changes( from, to, out = Dumper.new )
  from_keys = prepare_keys( from.tables )
  to_keys = prepare_keys( to.tables )

  old_keys, same_keys, new_keys = separate( from_keys, to_keys )

  from_names = from.table_names
  to_names = to.table_names

  old_names, same_names, new_names = separate( from_names, to_names )

  old_tables = from.named_tables( old_names )
  new_tables = to.named_tables( new_names )

  from_tables = from.named_tables( same_names )
  to_tables = to.named_tables( same_names )

  dump_drop_foreign_keys( out, old_keys )
  dump_drop_tables( out, old_tables )
  dump_alter_tables( out, from_tables, to_tables )
  dump_add_tables( out, new_tables )
  dump_add_foreign_keys( out, new_keys )

  out
end

#full_migration(from, to, out = Dumper.new) ⇒ Object Also known as: migration

Generate both ways Sequel migration.



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# File 'lib/miguel/migrator.rb', line 230

def full_migration( from, to, out = Dumper.new )
  out.dump "Sequel.migration" do
    out.dump "up" do
      changes( from, to, out )
    end
    out.dump "down" do
      changes( to, from, out )
    end
  end
end