tripal/legacy/tripal_project/theme/tripal_project.theme.inc

<?php
/**
 *
 *
 * @ingroup tripal_legacy_project
 */
function tripal_project_preprocess_tripal_project_relationships(&$variables) {
  $project = $variables['node']->project;

  // expand the project object to include the project relationships.
  $options = [
    'return_array' => 1,
    // we don't want to fully recurse we only need information about the
    // relationship type and the object and subject projects
    'include_fk' => [
      'type_id' => 1,
      'object_project_id' => 1,
      'subject_project_id' => 1,
    ],
  ];
  $project = chado_expand_var($project, 'table', 'project_relationship', $options);

  // get the subject relationships
  $srelationships = $project->project_relationship->subject_project_id;
  $orelationships = $project->project_relationship->object_project_id;

  // combine both object and subject relationshisp into a single array
  $relationships = [];
  $relationships['object'] = [];
  $relationships['subject'] = [];

  // iterate through the object relationships
  if ($orelationships) {
    foreach ($orelationships as $relationship) {
      $rel = new stdClass();
      $rel->record = $relationship;

      // get the relationship and child types
      $rel_type = t(preg_replace('/_/', " ", $relationship->type_id->name));

      // get the node id of the subject
      $sql = "SELECT nid FROM {chado_project} WHERE project_id = :project_id";
      $n = db_query($sql, [':project_id' => $relationship->subject_project_id->project_id])->fetchObject();
      if ($n) {
        $rel->record->nid = $n->nid;
      }

      $relationships['object'][$rel_type][] = $rel;
    }
  }

  // now add in the subject relationships
  if ($srelationships) {
    foreach ($srelationships as $relationship) {
      $rel = new stdClass();
      $rel->record = $relationship;

      $rel_type = t(preg_replace('/_/', " ", $relationship->type_id->name));

      // get the node id of the subject
      $sql = "SELECT nid FROM {chado_project} WHERE project_id = :project_id";
      $n = db_query($sql, [':project_id' => $relationship->object_project_id->project_id])->fetchObject();
      if ($n) {
        $rel->record->nid = $n->nid;
      }

      $relationships['subject'][$rel_type][] = $rel;
    }
  }
  $project->all_relationships = $relationships;
}