Quick Start

1. Implement hook_chado_custom_search to tell the API about the search you would like to create.

/**
 * Implement hook_chado_custom_search().
 *
 * This hook simply lists the machine name of the searches so that we can find
 * the info hook. We've done this for performance reasons.
 */
function example_ccsearch_chado_custom_search() {
  $searches = [];

  $searches['BreedingCrossSearch'] = 'Breeding Cross Search';

  return $searches;
}

2. Create a class which extends ChadoCustomSearch. At a minimum you need to set the editable static constants and the getQuery() method. Just copy this basic search and change it to suit your needs.
3. Clear the cache, navigate to the path defined in the class and enjoy your custom search!