SOLR: Copy record from second field if 1st field is null or not available

Question

Followed by this question: SOLR: how to copy data to another field with filtered values?

I have these types of values in solr

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Answer 1

Below is the way you can try and get the things working for you. Implementing a conditional copyField implemenation as below.

package mysolr;

import java.io.IOException;

import org.apache.solr.common.SolrInputDocument;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.response.SolrQueryResponse;
import org.apache.solr.update.AddUpdateCommand;
import org.apache.solr.update.processor.UpdateRequestProcessor;
import org.apache.solr.update.processor.UpdateRequestProcessorFactory;

public class ConditionalCopyProcessorFactory extends UpdateRequestProcessorFactory
{
  @Override
  public UpdateRequestProcessor getInstance(SolrQueryRequest req, SolrQueryResponse rsp, UpdateRequestProcessor next)
  {
    return new ConditionalCopyProcessor(next);
  }
}

class ConditionalCopyProcessor extends UpdateRequestProcessor
{
  public ConditionalCopyProcessor( UpdateRequestProcessor next) {
    super( next );
  }

  @Override
  public void processAdd(AddUpdateCommand cmd) throws IOException {
    SolrInputDocument doc = cmd.getSolrInputDocument();

    Object v = doc.getFieldValue( "Price" );
    if( v == "AUD" ) {
      Object priceSaleObject = doc.getFieldValue( "PriceSale" );
      float priceSale = Float.parseFloat( priceSaleObject.toString() );
      doc.addField("CustomPrice", priceSale);
      //addField(String name,Object value)
    }

    // pass it up the chain
    super.processAdd(cmd);
  }
}

With this code you need to create a jar named "ConditionalCopyProcessorFactory.jar".

In the solrConfig.xml, please add the following changes.

<lib dir="${solr.install.dir:../../../..}/plugins/" regex="ConditionalCopyProcessorFactory.jar" />

<updateRequestProcessorChain name="add-unknown-fields-to-the-schema" default="${update.autoCreateFields:true}"
           processor="uuid,remove-blank,field-name-mutating,parse-boolean,parse-long,parse-double,parse-date,add-schema-fields">
    <processor class="mysolr.ConditionalCopyProcessorFactory"/>
    <processor class="solr.LogUpdateProcessorFactory"/>
    <processor class="solr.DistributedUpdateProcessorFactory"/>
    <processor class="solr.RunUpdateProcessorFactory"/>
</updateRequestProcessorChain>