如何将对象从String平面化为SolrInputDocument

Question

我目前正在从某个消息传递服务接收JSON字符串形式的文档。

其中一份文件如下：

{
  "id":"1","name":"Item 1","price":10,
  "producer":{"id":"10","name":"Prod 1",
    "address": {"id":"100","city":"City 1","zipcode":95000}
  }
}

是否需要将此字符串转换为SolrInputDocument以将其提供给Solr？

Answer 1

您不需要将其转换为SolrinPutDocument。参见http://wiki.apache.org/solr/solrj#directly_adding_pojos_to_solr

但Solr不允许嵌套字段。您需要将JSON扁平化，即只保留标量，并且只保留数组（或列表）作为多值字段。您可以这样转换：

{
  "id":"1",
  "name":"Item 1",
  "price":10,
  "producer_id":"10",
  "producer_name":"Prod 1",
  "producer_address_id":"100",
  "producer_address_city": "city1",
  "producer_address_zipcode":95000
}

或者您也可以将生产者地址保留在多值字段中,如下所示：

{
  "id":"1",
  "name":"Item 1",
  "price":10,
  "producer_id":"10",
  "producer_name":"Prod 1",
  "producer_address":["100", "city1", "95000"]
}