Spring Data for Apache Solr Extended DisMax Parameters - solr

Question

I am trying to add the params below (qf,bq) in a Solr query generated by Spring Data Solr.
Solr parameters are :
qf => Spring Data Solr Method?
bq => Spring Data Solr Method?
I was able to find the methods below
fq => addFilterQuery
fl => addProjectionOnField
defType => setDefType
qt => setRequestHandler
I saw an open issue qf https://jira.spring.io/browse/DATASOLR-153
How can i add the qf and bq params to Solr query built with Spring Data Solr.
Thanks

Answer 1

You can use the SolrCallback on template level to access the SolrClient and execute the query from there or register your own QueryParser for a custom query type.
Maybe something like:
#Bean
public SolrTemplate solrTemplate(SolrClient client) {
SolrTemplate template = new SolrTemplate(client);
template.registerQueryParser(EdismaxQuery.class, new EdisMaxQueryParser());
return template;
}
class EdismaxQuery extends SimpleQuery {
// ... add stuff you need. Maybe `autoRelax`
}
class EdisMaxQueryParser extends QueryParserBase<EdismaxQuery> {
DefaultQueryParser defaultQueryParser = new DefaultQueryParser();
#Override
public SolrQuery doConstructSolrQuery(EdismaxQuery source) {
// just use the default parser to construct the query string in first place.
SolrQuery target = defaultQueryParser.constructSolrQuery(source);
// add missing parameters
target.add("defType", "edismax");
target.add("qf", source....);
return target;
}
}

Answer 2

There're some changes in Spring Data Solr API 4.0, so you may need to change how you registered your own QueryParser a bit.
#Bean
public SolrTemplate solrTemplate(SolrClient client) {
SolrTemplate template = new SolrTemplate(client);
solrTemplate.registerQueryParser(EdismaxQuery.class, new EdisMaxQueryParser(new SimpleSolrMappingContext()));
return template;
}
public static class EdismaxQuery extends SimpleQuery {
private String defaultField;
private String minimumShouldMatch;
private String boostQuery;
private String queryField;
public EdismaxQuery(String queryString) {
super(queryString);
}
//... typical getter/setter
}
public static class EdisMaxQueryParser extends QueryParserBase<AbstractQueryDecorator> {
private final DefaultQueryParser defaultQueryParser;
public EdisMaxQueryParser(MappingContext<? extends SolrPersistentEntity<?>, SolrPersistentProperty> mappingContext) {
super(mappingContext);
defaultQueryParser = new DefaultQueryParser(mappingContext);
}
#Override
public SolrQuery doConstructSolrQuery(AbstractQueryDecorator queryDecorator, Class<?> domainType) {
// for some reason the API wrapped our query object with NamedObjectsQuery, so we need to unwrapped/get our actual query object first
EdismaxQuery query = (EdismaxQuery) queryDecorator.getDecoratedQuery();
// use defaultQueryParser to populate basic query parameters
SolrQuery solrQuery = defaultQueryParser.doConstructSolrQuery(query, domainType);
// set our own 'extra' parameter
if (query.getDefaultField() != null) {
solrQuery.add("df", query.getDefaultField());
}
if (query.getMinimumShouldMatch() != null) {
solrQuery.add("mm", query.getMinimumShouldMatch());
}
if (query.getQueryField() != null) {
solrQuery.add("qf", query.getQueryField());
}
if (query.getBoostQuery() != null) {
solrQuery.add("bq", query.getBoostQuery());
}
//...
return target;
}
}
Here's how you query with new EdismaxQuery object
EdismaxQuery query = new EdismaxQuery("hello world");
query.setDefType("edismax");
query.setRows(3);
query.setQueryField("text^2");
query.setMinimumShouldMatch("30%");
query.setBoostQuery("date:[NOW/DAY-1YEAR TO NOW/DAY]");
Page<ResultBean> results = solrTemplate.query("collection", query, ResultBean.class);

Answer 3

In order to avoid:
org.springframework.data.solr.core.QueryParserBase$NamedObjectsQuery
cannot be cast to EdismaxQuery
EdisMaxQueryParser should look like this:
class EdisMaxQueryParser extends QueryParserBase {
#Override
public SolrQuery doConstructSolrQuery(SolrDataQuery source) {
// your stuff
}
}

Answer 4

If you are going to add static qf expression to each select query it could be done in solrconfig.xml:
<requestHandler name="/select" class="solr.SearchHandler">
<lst name="defaults">
...
</lst>
<lst name="appends">
<str name="defType">edismax</str>
<str name="qf">offerId^100 vendorCode^100</str>
</lst>
...
</requestHandler>

Answer 5

you can use edismax library for spring-solr https://github.com/KmSYS/edismax-solr-spring
But to overcome the problem of overwrite the registered query parsers at afterPropertiesSet() you need to add following bean at config class,
#Bean
public SolrTemplate solrTemplate(SolrClient client) {
SolrTemplate template = new SolrTemplate(client) {
#Override
public void afterPropertiesSet() {
super.afterPropertiesSet();
registerQueryParser(SimpleEdismaxQuery.class, new EdisMaxQueryParser(new SimpleSolrMappingContext()));
}
};
template.afterPropertiesSet();
return template;
}
Also, sample code at https://github.com/KmSYS/edismax-solr-spring-sample
http://www.kmsys.tech/solr/edixmax-query-parser-template.html