Question

我在NEST 2.3中使用Elastisearch.NET。我想使用属性映射，但我只想索引某些属性。据我所知，所有属性都被编入索引，除非您使用例如[String（Ignore = true）]忽略它们。默认情况下是否可以忽略所有属性并仅索引附加了nest属性的属性？像JSON.NETs MemberSerialization.OptIn

Answer 1

您可以使用自定义序列化程序来忽略未标记为NEST ElasticsearchPropertyAttributeBase派生属性的任何属性。

void Main()
{
    var pool = new SingleNodeConnectionPool(new Uri("http://localhost:9200"));
    var connectionSettings = new ConnectionSettings(
        pool, 
        new HttpConnection(), 
        new SerializerFactory(s => new CustomSerializer(s)));

    var client = new ElasticClient(connectionSettings);

    client.CreateIndex("demo", c => c
        .Mappings(m => m
            .Map<Document>(mm => mm
                .AutoMap()
            )
        )
    );
}

public class Document
{
    [String]
    public string Field1 { get; set;}

    public string Field2 { get; set; }

    [Number(NumberType.Integer)]
    public int Field3 { get; set; }

    public int Field4 { get; set; }
}

public class CustomSerializer : JsonNetSerializer
{
    public CustomSerializer(IConnectionSettingsValues settings, Action<JsonSerializerSettings, IConnectionSettingsValues> settingsModifier) : base(settings, settingsModifier) { }

    public CustomSerializer(IConnectionSettingsValues settings) : base(settings) { }

    public override IPropertyMapping CreatePropertyMapping(MemberInfo memberInfo)
    {
        // if cached before, return it
        IPropertyMapping mapping;
        if (Properties.TryGetValue(memberInfo.GetHashCode(), out mapping)) 
            return mapping;

        // let the base method handle any types from NEST
        // or Elasticsearch.Net
        if (memberInfo.DeclaringType.FullName.StartsWith("Nest.") ||
            memberInfo.DeclaringType.FullName.StartsWith("Elasticsearch.Net."))
            return base.CreatePropertyMapping(memberInfo);

        // Determine if the member has an attribute
        var attributes = memberInfo.GetCustomAttributes(true);
        if (attributes == null || !attributes.Any(a => typeof(ElasticsearchPropertyAttributeBase).IsAssignableFrom(a.GetType())))
        {
            // set an ignore mapping
            mapping = new PropertyMapping { Ignore = true };
            Properties.TryAdd(memberInfo.GetHashCode(), mapping);
            return mapping;
        }

        // Let base method handle remaining
        return base.CreatePropertyMapping(memberInfo);
    }
}

产生以下请求

PUT http://localhost:9200/demo?pretty=true 
{
  "mappings": {
    "document": {
      "properties": {
        "field1": {
          "type": "string"
        },
        "field3": {
          "type": "integer"
        }
      }
    }
  }
}

Elastisearch.net房产选择？

1 个答案: