Atomic-updates.md

Atomic updates

Atomic updates can be used update only specific fields in document. This can help speed up indexing in certain use cases. With SolrNet, atomic updates can be done using AtomicUpdate() methods.

Each individual update is defined by the AtomicUpdateSpec, which has below fields

• field - Name of field
• type - Type of operation to be done
• value - Value to be updated

AtomicUpdate() method requests update on a single document, which can be identified by the first parameter to the method.

Example

Consider a sample document of type Product as below,

public class Product {
    [SolrUniqueKey("id")]
    public string Id { get; set; }

    [SolrField("cat")]
    public ICollection<string> Categories { get; set; }

    [SolrField("sold")]
    public int SoldCount { get; set; }

    [SolrField("inStock")]
    public int InStock { get; set; }
}

Below code can be used to update a document with id mydoc by adding a new category toys and to increment the SoldCount by 14 and decrement InStock count by 6.

ISolrOperations<Product> solr = ...
solr.AtomicUpdate("mydoc",
  new[]
  {
      new AtomicUpdateSpec("cat", AtomicUpdateType.Add, "toys"),
      new AtomicUpdateSpec("sold", AtomicUpdateType.Inc, 14),
      new AtomicUpdateSpec("inStock", AtomicUpdateType.Inc, -6),
  });

Reference

See the Solr wiki for more information.