Module: HasManyPolymorphs

Defined in:
lib/has_many_polymorphs/railtie.rb,
lib/has_many_polymorphs/autoload.rb

Defined Under Namespace

Classes: Railtie

Constant Summary collapse

MODELS_ROOT =

Searches for models that use has_many_polymorphs or acts_as_double_polymorphic_join and makes sure that they get loaded during app initialization. This ensures that helper methods are injected into the target classes.

Note that you can override DEFAULT_OPTIONS via Rails::Configuration#has_many_polymorphs_options. For example, if you need an application extension to be required before has_many_polymorphs loads your models, add an after_initialize block in config/environment.rb that appends to the 'requirements' key:

Rails::Initializer.run do |config|
  # your other configuration here

  config.after_initialize do
    config.has_many_polymorphs.options['requirements'] << 'lib/my_extension'
  end
end

Rails.root.join('app', 'models')
DEFAULT_OPTIONS = 
{
:file_pattern => "#{MODELS_ROOT}/**/*.rb",
:file_exclusions => ['svn', 'CVS', 'bzr'],
:methods => ['has_many_polymorphs', 'acts_as_double_polymorphic_join'],
:requirements => []}
@@options = 
HashWithIndifferentAccess.new(DEFAULT_OPTIONS)

Class Method Summary collapse

Class Method Details

.setup ⇒ Object

Dispatcher callback to load polymorphic relationships from the top down.



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# File 'lib/has_many_polymorphs/autoload.rb', line 31

def self.setup

  _logger_debug "autoload hook invoked"

  options[:requirements].each do |requirement|
    _logger_warn "forcing requirement load of #{requirement}"
    require requirement
  end

  Dir.glob(options[:file_pattern]).each do |filename|
    next if filename =~ /#{options[:file_exclusions].join("|")}/
    open(filename) do |file|
      if file.grep(/#{options[:methods].join("|")}/).any?
        begin
          # determines the modelname by the directory - this allows the autoload of namespaced models
          modelname = filename[0..-4].gsub("#{MODELS_ROOT.to_s}/", "")
          model = modelname.camelize
          _logger_warn "preloading parent model #{model}"
          model.constantize
        rescue Object => e
          _logger_warn "#{model} could not be preloaded: #{e.inspect} #{e.backtrace}"
        end
      end
    end
  end
end