Class: Cassie::Schema::VersionLoader

Inherits:
Object
  • Object
show all
Defined in:
lib/cassie/schema/version_loader.rb

Direct Known Subclasses

VersionFileLoader, VersionObjectLoader

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#filename ⇒ Object (readonly)

Returns the value of attribute filename.



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# File 'lib/cassie/schema/version_loader.rb', line 5

def filename
  @filename
end

#version ⇒ Object (readonly)

Returns the value of attribute version.



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# File 'lib/cassie/schema/version_loader.rb', line 5

def version
  @version
end

Instance Method Details

#load ⇒ Version, Boolean

Requires the ruby file, thus loading the Migration class into the ObjectSpace.

Returns:

  • (Version, Boolean) —

    The Version object if successful. In other words, if object representing the version returns a Cassie::Schema::Migration object. Otherwise returns false.

Raises:

  • (NameError) —

    if the migration class could not be loaded



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# File 'lib/cassie/schema/version_loader.rb', line 14

def load
  return false unless filename
  require filename

  begin
    # ensure the migration class is now defined
    version.migration_class_name.constantize
    if version.migration.is_a?(Cassie::Schema::Migration)
      version
    else
      false
    end
  rescue NameError
    raise NameError.new("Expected #{version.migration_class_name} to be defined in #{filename}, but it was not.")
  end
end