tripal/legacy/tripal_project/theme/templates/tripal_project_relationships.tpl.php

<?php
/* Typically in a Tripal template, the data needed is retrieved using a call to
 * chado_expand_var function.  For example, to retrieve all 
 * of the project relationships for this node, the following function call would be made:
 * 
 *   $project = chado_expand_var($project,'table','project_relationship');
 * 
 * However, this function call can be extremely slow when there are numerous relationships.
 * This is because the chado_expand_var function is recursive and expands 
 * all data following the foreign key relationships tree.  Therefore, to speed retrieval
 * of data, a special variable is provided to this template:
 * 
 *   $project->all_relationships;
 *   
 * This variable is an array with two sub arrays with the keys 'object' and 'subject'.  The array with
 * key 'object' contains relationships where the project is the object, and the array with
 * the key 'subject' contains relationships where the project is the subject
 */
$project = $variables['node']->project;

$all_relationships = $project->all_relationships;
$object_rels = $all_relationships['object'];
$subject_rels = $all_relationships['subject'];

if (count($object_rels) > 0 or count($subject_rels) > 0) { ?>
    <div class="tripal_project-data-block-desc tripal-data-block-desc">This
        project is related to the following other projects:
    </div> <?php

  // the $headers array is an array of fields to use as the colum headers.
  // additional documentation can be found here
  // https://api.drupal.org/api/drupal/includes%21theme.inc/function/theme_table/7
  $headers = ['Relationship'];

  // the $rows array contains an array of rows where each row is an array
  // of values for each column of the table in that row.  Additional documentation
  // can be found here:
  // https://api.drupal.org/api/drupal/includes%21theme.inc/function/theme_table/7
  $rows = [];

  // first add in the subject relationships.  
  foreach ($subject_rels as $rel_type => $objects) {
    foreach ($objects as $object) {
      // link the project to it's node
      $object_name = $object->record->object_project_id->name;
      if (property_exists($object->record, 'nid')) {
        $object_name = l($object_name, "node/" . $object->record->nid, ['attributes' => ['target' => "_blank"]]);
      }
      $rows[] = [
        "$project->name is a \"$rel_type\" of $object_name",
      ];
    }
  }

  // second add in the object relationships.  
  foreach ($object_rels as $rel_type => $subjects) {
    foreach ($subjects as $subject) {
      // link the project to it's node
      $subject_name = $subject->record->subject_project_id->name;
      if (property_exists($subject->record, 'nid')) {
        $subject_name = l($subject_name, "node/" . $subject->record->nid, ['attributes' => ['target' => "_blank"]]);
      }
      $rows[] = [
        "$subject_name is a \"$rel_type\" of $project->name",
      ];
    }
  }
  // the $table array contains the headers and rows array as well as other
  // options for controlling the display of the table.  Additional
  // documentation can be found here:
  // https://api.drupal.org/api/drupal/includes%21theme.inc/function/theme_table/7
  $table = [
    'header' => $headers,
    'rows' => $rows,
    'attributes' => [
      'id' => 'tripal_project-table-relationship-subject',
      'class' => 'tripal-data-table',
    ],
    'sticky' => FALSE,
    'caption' => '',
    'colgroups' => [],
    'empty' => '',
  ];

  // once we have our table array structure defined, we call Drupal's theme_table()
  // function to generate the table.
  print theme_table($table);
}