Drupal 7: Alter apache solr query with custom module

Drupal 7: Alter apache solr query with custom module

# Add the following function in MyModule to override $query solr object
# This will change q param to sm_field_location:ha noi
function mymodule_apachesolr_query_alter(DrupalSolrQueryInterface $query) {
  // print_r($query)
	// print  $query->getParam('q');
	$query->replaceParam('q', 'sm_field_location:ha noi');
	print  $query->getParam('q');
	//print $query->q;
}

# Notes: sm_field_location must be indexed to be allowed field query first


References:
http://findsupport.xyz/question/27039724/solr-search-in-multiple-fields-in-drupal-7
https://gist.github.com/thuannvn/82c2166dcfc000bc5d5b