Class: ViewModel::Migration

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

Defined Under Namespace

Classes: Builder, NoPathError, OneWayError, StrictMigrationError, UnspecifiedVersionError

Constant Summary collapse

REFERENCE_ONLY_KEYS = 
[
  ViewModel::TYPE_ATTRIBUTE,
  ViewModel::ID_ATTRIBUTE,
  ViewModel::VERSION_ATTRIBUTE,
].freeze

Instance Method Summary collapse

Instance Method Details

#down(view, _references) ⇒ Object

Raises:



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# File 'lib/view_model/migration.rb', line 23

def down(view, _references)
  raise ViewModel::Migration::OneWayError.new(view[ViewModel::TYPE_ATTRIBUTE], :down)
end

#up(view, _references) ⇒ Object 



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# File 'lib/view_model/migration.rb', line 15

def up(view, _references)
  # Only a reference-only view may be (trivially) migrated up without an
  # explicit migration.
  if (view.keys - REFERENCE_ONLY_KEYS).present?
    raise ViewModel::Migration::OneWayError.new(view[ViewModel::TYPE_ATTRIBUTE], :up)
  end
end