Boolean
3 min
Use filters to narrow down search results or for database-like queries.
You can use the Filter method to filter Boolean and nullable Boolean fields in a couple of ways, as shown in the following use cases and examples.
Exists
To search for documents where a Boolean field has a value, use the Exists method. The following search finds blog posts with an Approved property with a value. The following code is similar to the LINQ query Where(x => x.Approved.HasValue).
var searchQuery = client.Search<BlogPost>()
.Filter(x => x.Approved.Exists());You can negate the filter with an exclamation point (!). To find blog posts that lack an Approved property, use the following code.
var searchQuery = client.Search<BlogPost>()
.Filter(x => !x.Approved.Exists());True or false
For exact matching, use the Match method. The following search matches blog posts whose Approved property is true. The LINQ equivalent is Where(x => x.Approved).
var searchQuery = client.Search<BlogPost>()
.Filter(x => x.Approved.Match(true));