如何从呈现器中筛选出属性/集合？

Question

例如，我有一个代表，如下所示：

module AccountRepresenter

  include Roar::Representer::JSON
  include Roar::Representer::Feature::Hypermedia

  property :id
  property :name

  collection :assets, :extend => AssetRepresenter, :class => Asset
end

在控制器中，我将其用作：

respond_with @accounts, represent_with: AccountsRepresenter

对于另一个动作，我不希望collection :assets出现。我试过了

respond_with @accounts, represent_with: AccountsRepresenter, exclude: :assets

但不起作用。我应该如何将争论传递给陈述者？

Answer 1

Roar使用的是下面可表示的(https://github.com/apotonick/representable#conditions)。您可以执行以下操作以具有条件功能：

respond_with @accounts, represent_with: AccountsRepresenter, exclude: [:assets]

然后

module AccountRepresenter

  include Roar::Representer::JSON
  include Roar::Representer::Feature::Hypermedia

  property :id
  property :name

  collection :assets, extend: AssetRepresenter, if: lambda { |opts| !opts[:exclude].includes?(:assets)] }
end