<?php

/**
 * @file
 * Installation functions for Relation Endpoint field type module.
 */

/**
 * Implements hook_field_schema().
 */
function relation_endpoint_field_schema() {
  $columns = array(
    'entity_type' => array(
      'type' => 'varchar',
      'length' => 255,
      'not null' => TRUE,
      'default' => '',
      'description' => 'Entity_type of this relation end-point.',
    ),
    'entity_id' => array(
      'type' => 'int',
      'unsigned' => TRUE,
      'not null' => TRUE,
      'default' => 0,
      'description' => 'Entity_id of this relation end-point.',
    ),
    'r_index' => array(
      'type' => 'int',
      'unsigned' => TRUE,
      'not null' => TRUE,
      'default' => 0,
      'description' => 'The index of this row in this relation. The highest index in the relation is stored as "arity" in the relation table.',
    ),
  );
  return array(
    'columns' => $columns,
    'indexes' => array(
      'relation' => array('entity_type', 'entity_id', 'r_index'),
    ),
  );
}