Ruby on rails 无法在ElasticSearch中索引非模型字段

我将Rails 6与ElasticSearchRails一起使用。我试图索引函数的结果，但它没有出现在索引中，并且不可搜索。这是我的班级

class Asset < ApplicationRecord

    include Elasticsearch::Model
    include Elasticsearch::Model::Callbacks

    def my_field
       return "this is my field"
    end

    def as_indexed_json(options={})
        as_json(only: [:my_field])
    end



    settings index: {
       number_of_shards: 10,
       max_ngram_diff: 50
   },
   analysis: {
       filter: {
       ngram_filter: {
          type: "ngram",
          min_gram: "3",
          max_gram: "10",
       }
   },
   analyzer: {
      ngram_filter: {
         type: "custom",
         tokenizer: "standard",
         filter: ["lowercase", "ngram_filter"]
       }
   }


  } do
  mapping do

     indexes :my_field, type: "text", analyzer: "standard"

   end
 end

end

---

当我为模型中定义的数据库字段编制索引时，一切正常，但我需要索引的函数的返回值。

您尝试过这个吗，我希望它能正常工作

class Asset < ApplicationRecord
  include Elasticsearch::Model
  include Elasticsearch::Model::Callbacks

  def my_field
    { my_field: "this is my field" }
  end

  def as_indexed_json(options={})
    as_json(only: [:id]).merge(my_field)
  end
end

类别资产

class Asset < ApplicationRecord
  include Elasticsearch::Model
  include Elasticsearch::Model::Callbacks

  def my_field
    { my_field: "this is my field" }
  end

  def as_indexed_json(options={})
    as_json(only: [:id]).merge(my_field)
  end
end