Sorting on Multiple Fields

问题

Does Nest support sorting on multiple fields? For example, say I want to sort first by FieldA ascending and then by FieldB descending.

My current approach looks something like this:

searchDescriptor.Sort(s =>s.OnField("FieldA").Ascending().OnField("FieldB").Descending());

But the "FieldB".Descending() part seems to be the only sort option that is sent to elasticsearch.

Does anyone know if there is another way to accomplish this?

回答1:

You are adding multiple fields on the same sort descriptor, which is overriding the previous value. Instead, you need to specify a new sort descriptor for each field:

searchDescriptor
    .Sort(s => s
        .OnField("FieldA")
        .Ascending()
    )
    .Sort(s => s
        .OnField("FieldB")
        .Descending()
    )

回答2:

I recent version of Nest the correct way of sortin on multiple fileds would be:

.Sort(s => s
    Field(f => f
        .Field("FieldA")
        .Order(SortOrder.Ascending)
    )
    .Field(f => f
        .Field("FieldB")
        .Order(SortOrder.Ascending)
    )
);

回答3:

for sorting on multiple dynamic fields, SortDescriptor can be useful.

        var sortDescriptor = new SortDescriptor<{YourType}>();

        sortDescriptor.Field(f => f.YourFieldName, Nest.SortOrder.Ascending);

        // If Field Name is Dynamic
        sortDescriptor.Field(
            "someOtherFieldName",
            Nest.SortOrder.Descending);         

        var searchResponse = await client.SearchAsync<{YourType}>(x => x
        .Query(y => query)
        .Sort(s => sortDescriptor)
        .From(from)
        .Size(size)
        );

回答4:

searchDescriptor
    .Sort(s => s
          .Ascending(a => a.OrgId)
          .Descending(d => d.CreateTimeInUtc)
    );

回答5:

You can use it like this. You also can use the names from your model.

   EsClient.Search<Business>(s => s
      .Query (qq=> {...})
      .Sort(sort => sort.OnField(s => s.Name).Descending())
      .Sort(sort => sort.OnField(s => s.Age).Descending())
    )

来源：https://stackoverflow.com/questions/25894560/sorting-on-multiple-fields

标签

nest