[英]Search on nested array using NEST(ElasticSearch)
I want to filter data in nested array using Nest.我想使用 Nest 过滤嵌套数组中的数据。 Given I have following classes:鉴于我有以下课程:
public class Package
{
public IEnumerable<PackageItem> PackageItems { get; set; }
}
public class PackageItem
{
public string Title { get; set; }
public decimal Price { get; set; }
}
and I have index these data in ElasticSearch using NEST: Here is my data:我使用 NEST 在 ElasticSearch 中索引了这些数据:这是我的数据:
"hits" : [
{
"_index" : "packages",
"_type" : "_doc",
"_id" : "cf08b05c-c8b5-45cb-bca8-17267c3613fb",
"_score" : 1.0,
"_source" : {
"id" : "cf08b05c-c8b5-45cb-bca8-17267c3613fb",
"PackageItems" : [
{
"Title" : "some-title",
"price" : 100000.0
},
{
"Title" : "some-title",
"price" : 200000.0
}
]
}
},
{
"_index" : "packages",
"_type" : "_doc",
"_id" : "39436cb3-483e-4fb4-92e4-4e06ecad27a1",
"_score" : 1.0,
"_source" : {
"id" : "39436cb3-483e-4fb4-92e4-4e06ecad27a1",
"PackageItems" : [
{
"Title" : "some-title",
"price" : 100000.0
},
{
"Title" : "some-title",
"price" : 400000.0
}
]
}
},
{
"_index" : "packages",
"_type" : "_doc",
"_id" : "cd5d3587-838b-46ec-babc-d756c5587396",
"_score" : 1.0,
"_source" : {
"id" : "cd5d3587-838b-46ec-babc-d756c5587396",
"PackageItems" : [
{
"Title" : "some-title",
"price" : 300000.0
},
{
"Title" : "some-title",
"price" : 500000.0
}
]
}
}
]
I want to filter packages with minimumPackageItemPrice:100000 and maximumPackageItemPrice:400000.我想过滤具有 minimumPackageItemPrice:100000 和 maximumPackageItemPrice:400000 的包。 What query should I execute using NEST?我应该使用 NEST 执行什么查询?
The result should be like this:结果应该是这样的:
"hits" : [
{
"_index" : "packages",
"_type" : "_doc",
"_id" : "cf08b05c-c8b5-45cb-bca8-17267c3613fb",
"_score" : 1.0,
"_source" : {
"id" : "cf08b05c-c8b5-45cb-bca8-17267c3613fb",
"PackageItems" : [
{
"Title" : "some-title",
"price" : 100000.0
},
{
"Title" : "some-title",
"price" : 200000.0
}
]
}
},
{
"_index" : "inventories",
"_type" : "_doc",
"_id" : "39436cb3-483e-4fb4-92e4-4e06ecad27a1",
"_score" : 1.0,
"_source" : {
"id" : "39436cb3-483e-4fb4-92e4-4e06ecad27a1",
"PackageItems" : [
{
"Title" : "some-title",
"price" : 100000.0
},
{
"Title" : "some-title",
"price" : 400000.0
}
]
}
}
]
To trigger range queries on Elasticsearch through NEST
, you can make use of the range query.要通过NEST
触发 Elasticsearch 上的范围查询,您可以使用范围查询。 The approach is that you can construct a range query for your scenario and trigger that query through the NEST
client's search method.方法是您可以为您的场景构建一个范围查询,并通过NEST
客户端的搜索方法触发该查询。
// This method builds the range query where price should be between
// 100000.0 and 400000.0 (inclusive range in this case)
private static QueryContainer BuildNestedRangeQuery()
{
return new QueryContainerDescriptor<Package>()
.Nested(n =>
n.Path(p => p.PackageItems)
.Query(q => q
.Range(r => r
.Field(f => f.PackageItems.FirstOrDefault().Price)
.GreaterThanOrEquals(100000.0)
.LessThanOrEquals(400000.0))
)
)
)
}
Search can be triggered through the NEST
client as shown below.搜索可以通过NEST
客户端触发,如下所示。 This may vary according to your own implementation.这可能会根据您自己的实现而有所不同。 However, the above range query remains the same.但是,上述范围查询保持不变。
// Replace T with type of your choice and client is NEST client
var result = client.Search<T>(
.From(0)
.Size(20)
.Query(q => BuildNestedRangeQuery())
// other methods that you want to chain go here
)
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