Module: Heimdallr::ResourceImplementation

Defined in:
lib/heimdallr/resource.rb

Class Method Summary collapse

Class Method Details

.action_type(action, options) ⇒ Object 



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# File 'lib/heimdallr/resource.rb', line 123

def action_type(action, options)
  if options[:related]
    :related_record
  else
    action = action.to_sym
    case action
    when :index
      :collection
    when :new, :create
      :new_record
    when :show, :edit, :update, :destroy
      :record
    else
      if options[:collection] && options[:collection].include?(action)
        :collection
      elsif options[:new] && options[:new].include?(action)
        :new_record
      else
        :record
      end
    end
  end
end

.authorize(controller, options) ⇒ Object 



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# File 'lib/heimdallr/resource.rb', line 70

def authorize(controller, options)
  value = controller.instance_variable_get(ivar_name(controller, options))
  return unless value

  controller.instance_variable_set(ivar_name(controller, options.merge(:insecure => true)), value)

  value = value.restrict(controller.security_context)
  controller.instance_variable_set(ivar_name(controller, options), value)

  case controller.params[:action]
  when 'new', 'create'
    value.assign_attributes(value.reflect_on_security[:restrictions].fixtures[:create])

    unless value.reflect_on_security[:operations].include? :create
      raise Heimdallr::AccessDenied, "Cannot create model"
    end

  when 'edit', 'update'
    value.assign_attributes(value.reflect_on_security[:restrictions].fixtures[:update])

    unless value.reflect_on_security[:operations].include? :update
      raise Heimdallr::AccessDenied, "Cannot update model"
    end

  when 'destroy'
    unless value.destroyable?
      raise Heimdallr::AccessDenied, "Cannot delete model"
    end
  end unless options[:related]
end

.class_name(options) ⇒ Object 



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# File 'lib/heimdallr/resource.rb', line 155

def class_name(options)
  if options.kind_of? Hash
    options[:resource]
  else
    options.to_s
  end.classify
end

.ivar_name(controller, options) ⇒ Object 



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# File 'lib/heimdallr/resource.rb', line 115

def ivar_name(controller, options)
  if action_type(controller.params[:action], options) == :collection
    :"@#{variable_name(options).pluralize}"
  else
    :"@#{variable_name(options)}"
  end
end

.load(controller, options) ⇒ Object 



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# File 'lib/heimdallr/resource.rb', line 17

def load(controller, options)
  unless controller.instance_variable_defined?(ivar_name(controller, options))
    if options.has_key? :through
      target = load_target(controller, options)

      if target
        if options[:singleton]
          scope = target.send(:"#{variable_name(options)}")
        else
          scope = target.send(:"#{variable_name(options).pluralize}")
        end
      elsif options[:shallow]
        scope = class_name(options).constantize.scoped
      else
        raise "Cannot fetch #{options[:resource]} via #{options[:through]}"
      end
    else
      scope = class_name(options).constantize.scoped
    end

    loaders = {
      collection: -> {
        controller.instance_variable_set(ivar_name(controller, options), scope)
      },

      new_record: -> {
        controller.instance_variable_set(
          ivar_name(controller, options),
          scope.new(controller.params[params_key_name(options)] || {})
        )
      },

      record: -> {
        controller.instance_variable_set(
          ivar_name(controller, options),
          scope.find([:"#{params_key_name(options)}_id", :id].map{|key| controller.params[key] }.reject(&:blank?)[0])
        )
      },

      related_record: -> {
        unless controller.params[:"#{params_key_name(options)}_id"].blank?
          controller.instance_variable_set(
            ivar_name(controller, options),
            scope.find(controller.params[:"#{params_key_name(options)}_id"])
          )
        end
      }
    }

    loaders[action_type(controller.params[:action], options)].()
  end
end

.load_target(controller, options) ⇒ Object 



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# File 'lib/heimdallr/resource.rb', line 101

def load_target(controller, options)
  Array.wrap(options[:through]).map do |parent|
    loaded = controller.instance_variable_get(:"@#{variable_name parent}")
    unless loaded
      load(controller, :resource => parent.to_s, :related => true)
      loaded = controller.instance_variable_get(:"@#{variable_name parent}")
    end
    if loaded && options[:authorize_chain]
      authorize(controller, :resource => parent.to_s, :related => true)
    end
    controller.instance_variable_get(:"@#{variable_name parent}")
  end.reject(&:nil?).first
end

.params_key_name(options) ⇒ Object 



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# File 'lib/heimdallr/resource.rb', line 163

def params_key_name(options)
  if options.kind_of? Hash
    options[:resource]
  else
    options.to_s
  end.split('/').last
end

.prepare_options(klass, options) ⇒ Object 



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# File 'lib/heimdallr/resource.rb', line 7

def prepare_options(klass, options)
  options = options.merge :resource => (options[:resource] || klass.name.sub(/Controller$/, '').underscore).to_s

  filter_options = {}
  filter_options[:only]   = options.delete(:only)   if options.has_key?(:only)
  filter_options[:except] = options.delete(:except) if options.has_key?(:except)

  [ options, filter_options ]
end

.variable_name(options) ⇒ Object 



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# File 'lib/heimdallr/resource.rb', line 147

def variable_name(options)
  if options.kind_of? Hash
    options[:resource]
  else
    options.to_s
  end.parameterize('_')
end