Class: Hydra::Migrate::Migration

Inherits:
Object
  • Object
show all
Defined in:
lib/hydra/migrate/migration.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(migrator) ⇒ Migration

Returns a new instance of Migration.



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# File 'lib/hydra/migrate/migration.rb', line 31

def initialize(migrator)
  self.class.actions.each { |action| migrator.define_migration(*action) }
end

Class Method Details

.actions ⇒ Object 



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# File 'lib/hydra/migrate/migration.rb', line 5

def actions
  @actions ||= []
end

.migrate(opts = {}, &block) ⇒ Object 



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# File 'lib/hydra/migrate/migration.rb', line 22

def migrate opts={}, &block
  unless opts.is_a?(Hash) and opts.length == 1
    raise ArgumentError, "migrate <from_version> => <to_version>"
  end

  actions << [{:for=>target_class, :from=>opts.keys.first, :to=>opts.values.first}, block]
end

.migrates(klass) ⇒ Object 



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# File 'lib/hydra/migrate/migration.rb', line 9

def migrates klass
  unless klass.is_a?(Class) and klass.ancestors.include?(Hydra::ModelMixins::Migratable)
    raise TypeError, "Unknown migratable class: #{klass.to_s}"
  end
  @target_class = klass
end

.target_class ⇒ Object 



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# File 'lib/hydra/migrate/migration.rb', line 16

def target_class
  return @target_class if @target_class
  klass = Module.const_get(self.name.sub(/Migration$/,'').to_sym)
  migrates klass
end