Active Model Serializer和Paperclip尺寸不同

时间:2014-01-07 02:48:47

标签: ruby-on-rails ruby-on-rails-3.2 paperclip active-model-serializers

我有一个资产模型类,它使用paperclip 3.5.2具有不同的大小:

class AssetSerializer < ActiveModel::Serializer
  attributes :id, :asset # works fine
  # would like to output small but don't seem to be able to
  #attributes :id, :asset, :asset(:small) 
end

这有点令人困惑,因为Paperclip使用了名称类,而模型被称为类(确实令人困惑)。我收到以下错误:

/Users/jt/repos/rails/app/serializers/asset_serializer.rb:2: syntax error, unexpected '(', expecting keyword_end
  attributes :id, :asset, :asset(:small)

它显然不喜欢传递给资产的参数

3 个答案:

答案 0 :(得分:6)

您只需在序列化程序中添加自定义属性

即可

他们在文档https://github.com/rails-api/active_model_serializers#attributes

中有一个示例

以下是您的例子。

class AssetSerializer < ActiveModel::Serializer
  attributes :id, :asset, :asset_small

  def asset_small
    object.asset.url(:small)
  end
end

答案 1 :(得分:0)

我不确定它是否有效,但试试这个: 或者可能围绕define_method来覆盖:asset。

class AssetSerializer < ActiveModel::Serializer
  attributes :id, :asset 

  self._attributes.each do |attribute, value|
    define_method(attribute) do
      object.read_attribute(attribute)
    end
  end
end

答案 2 :(得分:0)

刚刚在课堂上编写方法,并将它们称为......

class Asset < ActiveRecord::Base
  ...
  def asset_small
    asset.url(:small)
  end

  def asset_original
    asset.url
  end
  ...
end

...

class AssetSerializer < ActiveModel::Serializer
  attributes :id, :asset_small, :asset_original
end

并且工作正常。