tripal/tripal_stock/tripal_stock.module

<?php

/**
 * @file
 * Implements Tripal Stock Module hooks
 */

/**
 * @defgroup tripal_stock Stock Module
 * @{
 * Provides functions for managing chado stocks including creating details pages for each stock
 *
 * The Tripal Stock Module provides functionality for adding, editing, deleting and accessing chado
 * stocks. The stock module was designed to store information about stock collections in a
 * laboratory. What is called a stock could also be called a strain or an accession. There is a lot
 * in common between a Drosophila stock and a Saccharomyces strain and an Arabidopsis line. They all
 * come from some taxon, have genotypes, physical locations in the lab, some conceivable
 * relationship with a publication, some conceivable relationship with a sequence feature (such as a
 * transgene), and could be described by some ontology term. For more information about the chado
 * Stock Module see the GMOD Wiki Page (http://gmod.org/wiki/Chado_Stock_Module)
 * @}
 * @ingroup tripal_modules
 */
require("tripal_stock-administration.inc");

require("tripal_stock.api.inc");
require("other_module_api_functions.inc");

require("tripal_stock-secondary_tables.inc");
require("tripal_stock-properties.inc");
require("tripal_stock-relationships.inc");
require("tripal_stock-db_references.inc");

/**
 * Implements hook_menu(): Adds menu items for the tripal_stock
 *
 * @return
 *   Menu definitions for the tripal_stock
 *
 * @ingroup tripal_stock
 */
function tripal_stock_menu() {
  $items = array();

  //Administrative settings menu-----------------
  $items['admin/tripal/tripal_stock'] = array(
    'title' => 'Stocks',
    'description' => 'Basic Description of Tripal Stock Module Functionality',
    'page callback' => 'tripal_stock_module_description_page',
    'access arguments' => array('administer site configuration'),
    'type' => MENU_NORMAL_ITEM
  );

  $items['admin/tripal/tripal_stock/configuration'] = array(
    'title' => 'Configuration',
    'description' => 'Settings for Chado Stocks',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('tripal_stock_admin'),
    'access arguments' => array('administer site configuration'),
    'type' => MENU_NORMAL_ITEM
  );

  // Adding Secondary Properties-----------------
  $items['node/%cs_node/properties'] = array(
    'title' => 'Add Properties & Synonyms',
    'description' => 'Settings for Chado Stocks',
    'page callback' => 'tripal_stock_add_ALL_property_page',
    'page arguments' => array(1),
    'access arguments' => array('create chado_stock content'),
    'type' => MENU_CALLBACK
  );

  $items['node/%cs_node/db_references'] = array(
    'title' => 'Add Database References',
    'description' => 'Settings for Chado Stocks',
    'page callback' => 'tripal_stock_add_ALL_dbreferences_page',
    'page arguments' => array(1),
    'access arguments' => array('create chado_stock content'),
    'type' => MENU_CALLBACK
  );

  $items['node/%cs_node/relationships'] = array(
    'title' => 'Add Relationships',
    'description' => 'Settings for Chado Stocks',
    'page callback' => 'tripal_stock_add_ALL_relationships_page',
    'page arguments' => array(1),
    'access arguments' => array('create chado_stock content'),
    'type' => MENU_CALLBACK
  );

  //Edit/Deleting Secondary Properties-------------
  $items['node/%cs_node/edit_properties'] = array(
    'title' => 'Edit Properties',
    'description' => 'Settings for Chado Stocks',
    'page callback' => 'tripal_stock_edit_ALL_properties_page',
    'page arguments' => array(1),
    'access arguments' => array('edit chado_stock content'),
    'type' => MENU_LOCAL_TASK,
    'weight' => 8,
  );

    $items['node/%cs_node/edit_relationships'] = array(
    'title' => 'Edit Relationships',
    'description' => 'Settings for Chado Stocks',
    'page callback' => 'tripal_stock_edit_ALL_relationships_page',
    'page arguments' => array(1),
    'access arguments' => array('edit chado_stock content'),
    'type' => MENU_LOCAL_TASK,
    'weight' => 9,
  );

  $items['node/%cs_node/edit_db_references'] = array(
    'title' => 'Edit DB References',
    'description' => 'Settings for Chado Stocks',
    'page callback' => 'tripal_stock_edit_ALL_dbreferences_page',
    'page arguments' => array(1),
    'access arguments' => array('edit chado_stock content'),
    'type' => MENU_LOCAL_TASK,
    'weight' => 10,
  );
  return $items;
}

/**
 * Implements Menu wildcard_load hook
 *
 * Purpose: Allows the node ID of a chado stock to be dynamically
 *   pulled from the path. The node is loaded from this node ID
 *   and supplied to the page as an arguement. This is an example
 *   of dynamic argument replacement using wildcards in the path.
 *
 * @param $nid
 *   The node ID passed in from the path
 *
 * @return
 *   The node object with the passed in nid
 *
 * @ingroup tripal_stock
 */
function cs_node_load($nid) {
  if (is_numeric($nid)) {
    $node = node_load($nid);
    if ($node->type == 'chado_stock') {
      return $node;
    }
  }

  return FALSE;
}

/**
 * Implementation of hook_perm().
 *
 * Purpose: Set the permission types that the chado stock module uses
 *
 * @return
 *   Listing of the possible permission catagories
 *
 * @ingroup tripal_stock
 */
function tripal_stock_perm() {
  return array(
    'access chado_stock content',
    'create chado_stock content',
    'edit chado_stock content',
    'delete chado_stock content'
  );
}

/**
 * Implements hook_access(): Maps permission catagories to actions
 *
 * @param $op
 *   The operation current operation: one of create, update, delete
 * @param $node
 *   The node object the current operation is being performed on
 * @param $account
 *   A user object representing the user for whom the operation is to be performed
 *
 * @return
 *   TRUE grants access; FALSE denies it
 *
 * @ingroup tripal_stock
 */
function chado_stock_access($op, $node, $account) {
  if ($op == 'create') {
    if (!user_access('create chado_stock content', $account)) {
      return FALSE;
    }
  }
  if ($op == 'update') {
    if (!user_access('edit chado_stock content', $account)) {
      return FALSE;
    }
  }
  if ($op == 'delete') {
    if (!user_access('delete chado_stock content', $account)) {
      return FALSE;
    }
  }
  if ($op == 'view') {
    if (!user_access('access chado_stock content', $account)) {
      return FALSE;
    }
  }
  return NULL;
}

/**
 * Implements hook_views_api()
 *
 * Purpose: Essentially this hook tells drupal that there is views support for
 *  for this module which then includes tripal_stock.views.inc where all the
 *  views integration code is
 *
 * @return
 *   An array with fields important for views integration
 *
 * @ingroup tripal_stock
 */
function tripal_stock_views_api() {
  return array(
    'api' => 2.0,
  );
}

/**
 * Implements hook_theme(): Register themeing functions for this module
 *
 * @return
 *   An array of themeing functions to register
 *
 * @ingroup tripal_stock
 */
function tripal_stock_theme() {
  return array(

    // Property edit forms--------------------------
    'tripal_stock_edit_ALL_properties_form' => array(
      'arguments' => array('form'),
      'function' => 'theme_tripal_stock_edit_ALL_properties_form',
    ),
    'tripal_stock_edit_ALL_db_references_form' => array(
      'arguments' => array('form'),
      'function' => 'theme_tripal_stock_edit_ALL_db_references_form',
    ),
    'tripal_stock_edit_ALL_relationships_form' => array(
      'arguments' => array('form'),
      'function' => 'theme_tripal_stock_edit_ALL_relationships_form',
    ),
    // Block Templates------------------------------
    'tripal_stock_base' => array(
      'arguments' => array('node' => NULL),
      'template' => 'tripal_stock_base',
    ),
    'tripal_stock_properties' => array(
      'arguments' => array('node' => NULL),
      'template' => 'tripal_stock_properties',
    ),
    'tripal_stock_references' => array(
      'arguments' => array('node' => NULL),
      'template' => 'tripal_stock_references',
    ),
    'tripal_stock_relationships' => array(
      'arguments' => array('node' => NULL),
      'template' => 'tripal_stock_relationships',
    ),
    'tripal_stock_synonyms' => array(
      'arguments' => array('node' => NULL),
      'template' => 'tripal_stock_synonyms',
    ),
  );
}

/**
 * Implements hook_node_info(): registers a stock node type
 *
 * @return
 *   An array describing various details of the node
 *
 * @ingroup tripal_stock
 */
function tripal_stock_node_info() {
  return array(
    'chado_stock' => array(
      'name' => t('Stock'),
      'module' => 'chado_stock',
      'description' => t('A Chado Stock is a collection of material that can be sampled and have experiments performed on it.'),
      'has_title' => TRUE,
      'has_body' => FALSE,
    ),
  );
}

/**
 * Implements hook_load(): Prepares the chado_stock node
 *
 * @param $node
 *   The basic node containing all variables common to all nodes
 *
 * @return
 *   A stock node containing all the variables from the basic node and all stock specific variables
 *
 * @ingroup tripal_stock
 */
function chado_stock_load($node) {

  // Get stock_id from chado_stock linking table
  $map = db_fetch_object(db_query(
    "SELECT stock_id as stock_id FROM {chado_stock} WHERE vid=%d",
    $node->vid
  ));

  // Get stock content and add to node
  $stock = tripal_core_generate_chado_var('stock', array('stock_id' => $map->stock_id));
  //
  // move expandable fields downwards
  $node->expandable_fields = $stock->expandable_fields;
  unset($stock->expandable_fields);
  $node->expandable_tables = $stock->expandable_tables;
  unset($stock->expandable_tables);
  $node->expandable_nodes = $stock->expandable_nodes;
  unset($stock->expandable_nodes);
  $node->stock = $stock;

  return $node;
}


/**
 * Implements hook_form(): Creates the main Add/Edit/Delete Form for chado stocks
 *
 * Parts to be added by this form
 *     name,
 *     uniquename,
 *     description,
 *     type => select from cvterm with key cvterm_id,
 *     organism => select from available with key organism_id
 *     main_db_reference => accession, version, description, db_name(select from dropdown)
 *
 * @param $node
 *   An empty node object on insert OR the current stock node object on update
 * @param $form_state
 *   The current state of the form
 *
 * @return
 *   A description of the form to be rendered by drupal_get_form()
 *
 * @ingroup tripal_stock
 */
function chado_stock_form($node, $form_state) {

  // Expand all fields needed
  $fields_needed = array('stock.uniquename', 'stock.name', 'stock.stock_id', 'stock.type_id', 'stock.organism_id', 'stock.description', 'stock.dbxref_id', 'dbxref.accession', 'dbxref.description', 'dbxref.db_id', 'db.db_id');
  foreach ($fields_needed as $field_name) {
    // Check to see if it's excluded and expand it if so
    if ($node->expandable_fields) {
      if (in_array($field_name, $node->expandable_fields)) {
        $node = tripal_core_expand_chado_vars($node, 'field', $field_name);
      }
    }
  }

  // This defines the path for the next step in a simulated multipart form
  // NOTE: The %node gets replaced with the nid in insert
  $form['next_step_path'] = array(
    '#type' => 'hidden',
    '#value' => 'node/%node/properties'
  );

  // If you don't want a multipart form set this to false
  // Will then do default redirect (to new node) on submit
  $form['simulate_multipart'] = array(
    '#type' => 'textfield',
    '#attributes' => array('style' => "display:none"),
    '#default_value' => TRUE
  );

  if (!isset($node->stock->uniquename)) {
    $form['progress'] = array(
      '#type' => 'item',
      '#value' => tripal_stock_add_chado_properties_progress('main')
    );
  }

  $form['names'] = array(
    '#type' => 'fieldset',
    '#title' => t('Stock Name')
  );

  $form['names']['title'] = array(
    '#type' => 'textfield',
    '#title' => t('Name'),
    '#default_value' => $node->stock->name,
    '#required'       => TRUE
  );

  $form['names']['uniquename'] = array(
    '#type' => 'textfield',
    '#title' => t('Unique Name'),
    '#default_value' => $node->stock->uniquename,
    '#required'       => TRUE
  );

  $form['names']['stock_id'] = array(
    '#type' => 'hidden',
    '#value' => $node->stock->stock_id
  );

  $form['details'] = array(
    '#type' => 'fieldset',
    '#title' =>  t('Stock Details')
  );

  $type_options = tripal_cv_get_cvterm_options( variable_get('chado_stock_types_cv', 'NULL') );
  $type_options[0] = 'Select a Type';
  if ($node->nid == '') {
  $type_default = 0; }
  else { $type_default = $node->stock->type_id->cvterm_id; }
  $form['details']['type_id'] = array(
    '#type' => 'select',
    '#title' => t('Type of Stock'),
    '#options' => $type_options,
    '#default_value' => $type_default,
    '#required'    => TRUE,
  );

  $stock_oganism_options = tripal_organism_get_organism_options();
  $stock_oganism_options[0] = 'Select An Organism';
  if ($node->nid == '') {
  $organism_default = 0; }
  else {  $organism_default = $node->stock->organism_id->organism_id; }
  $form['details']['organism_id'] = array(
    '#type' => 'select',
    '#title' => t('Source Organism for stock'),
    '#default_value' => $organism_default,
    '#options' => $stock_oganism_options,
    '#required'    => TRUE
  );


  $form['details']['stock_description'] = array(
    '#type' => 'textarea',
    '#title' => t('Notes'),
    '#default_value' => $node->stock->description,
    '#description' => t('Briefly enter any notes on the above stock. This should not include phenotypes or genotypes.'),
  );

  $form['database_reference'] = array(
    '#type' => 'fieldset',
    '#title' => t('Stock Database Reference')
  );

  $form['database_reference']['accession'] = array(
    '#type' => 'textfield',
    '#title' => t('Accession'),
    '#default_value' => $node->stock->dbxref_id->accession
  );

  $form['database_reference']['db_description'] = array(
    '#type' => 'textarea',
    '#title' => t('Description of Database Reference'),
    '#default_value' => $node->stock->dbxref_id->description,
    '#description' => t('Optionally enter a description about the database accession.')
  );

  $db_options = tripal_db_get_db_options();
  $db_options[0] = 'Select a Database';
  if ($node->nid == '') {
  $db_default = 0; }
  else { $db_default = $node->stock->dbxref_id->db_id->db_id; }
  $form['database_reference']['database'] = array(
    '#type' => 'select',
    '#title' => t('Database'),
    '#options' => $db_options,
    '#default_value' => $db_default
  );

  return $form;
}

/**
 * Implements hook_validate(): Validate the input from the chado_stock node form
 *
 * @param $node
 *   The current node including fields with the form element names and submitted values
 * @param $form
 *   A description of the form to be rendered by drupal_get_form()
 *
 * @ingroup tripal_stock
 */
function chado_stock_validate($node, &$form) {

  $int_in_chado_sql = "SELECT count(*) as count FROM %s WHERE %s=%d";
  $string_in_chado_sql = "SELECT count(*) as count FROM %s WHERE %s='%s'";

  // Validate Uniquename only if add
  if (empty($node->stock_id)) {
    $previous_db = tripal_db_set_active('chado');
    $chado_row = db_fetch_object(db_query("SELECT * FROM {stock} WHERE uniquename='" . $node->uniquename . "'"));
    tripal_db_set_active($previous_db);
    if (!empty($chado_row->stock_id)) {
      $drupal_row = db_fetch_object(db_query("SELECT * FROM {chado_stock} WHERE stock_id=" . $chado_row->stock_id));
      if (!empty($drupal_row->nid)) {
        $link = l('node/' . $drupal_row->nid, $node->uniquename);
        form_set_error('uniquename', "There is already a stock with that uniquename $link. Please enter another uniquename.");
      }
      else {
        form_set_error('uniquename', "There is already a stock with that uniquename (although it's not sync'd with drupal). Please enter another uniquename.");
      }
    }
  }


  // Check Type of Stock is valid cvterm_id in chado ( $form['values']['details']['type_id'] )
  if ( $node->type_id == 0) {
    form_set_error('type_id', 'Please select a type of stock.');
  }
  else {
    $previous_db = tripal_db_set_active('chado');
    $num_rows = db_fetch_object(db_query($int_in_chado_sql, 'cvterm', 'cvterm_id', $node->type_id));
    tripal_db_set_active($previous_db);
    if ( $num_rows->count != 1) {
      form_set_error('type_id', "The type you selected is not valid. Please choose another one. (CODE:$num_rows)"); }
  }

  // Check Source Organism is valid organism_id in chado ( $form['values']['details']['organism_id'] )
  if ( $node->organism_id == 0) {
    form_set_error('organism_id', 'Please select a source organism for this stock');
  }
  else {
    $previous_db = tripal_db_set_active('chado');
    $num_rows = db_fetch_object(db_query($int_in_chado_sql, 'organism', 'organism_id', $node->organism_id));
    tripal_db_set_active($previous_db);
    if ( $num_rows->count != 1 ) {
      form_set_error('organism_id', "The organism you selected is not valid. Please choose another one. (CODE:$num_rows)"); }
  }

  // Check if Accession also database
  if ($node->accession != '') {
    if ($node->database == 0) {
      // there is an accession but no database selected
      form_set_error('database', 'You need to enter both a database and an accession for that database in order to add a database reference.');
    }
  }
  else {
    if ($node->database > 0) {
      // there is a database selected but no accession
      form_set_error('accession', 'You need to enter both a database and an accession for that database in order to add a database reference.');
    }
  }

  // Check database is valid db_id in chado ( $form['values']['database_reference']['database'] )
  if ( $node->database > 0) {
    $previous_db = tripal_db_set_active('chado');
    $num_rows = db_fetch_object(db_query($int_in_chado_sql, 'db', 'db_id', $node->database));
    tripal_db_set_active($previous_db);
    if ($num_rows->count != 1) {
      form_set_error('database', 'The database you selected is not valid. Please choose another one.'); }
  }

}

/**
 * Implements hook_insert(): Inserts data from chado_stock_form() into drupal and chado
 *
 * @param $node
 *   The current node including fields with the form element names and submitted values
 *
 * @return
 *   TRUE if the node was successfully inserted into drupal/chado; FALSE otherwise
 *
 * @ingroup tripal_stock
 */
function chado_stock_insert($node) {

  //If the chado stock exists
  // then don't create but simply link to node
  if ($node->chado_stock_exists) {
    if (!empty($node->stock_id)) {
      db_query(
        "INSERT INTO {chado_stock} (nid, vid, stock_id) "
        ."VALUES (%d, %d, %d)",
        $node->nid,
        $node->vid,
        $node->stock_id
      );
    }
    return $node;
  }

  // create dbxref
  if ( !empty($node->accession) ) {
    if ( !empty($node->database) ) {
      $values = array(
        'db_id' => $node->database,
        'accession' => $node->accession,
      );
      if (!tripal_core_chado_select('dbxref', array(dbxref_id), $values)) {
        $values['description'] = $node->db_description;
        $values['version'] = '1';
        $dbxref_status = tripal_core_chado_insert('dbxref', $values);
        if (!$dbxref_status) {
          drupal_set_message(t('Unable to add database reference to this stock.'), 'warning');
          watchdog('tripal_stock',
            'Insert Stock: Unable to create dbxref where values:%values',
            array('%values' => print_r($values, TRUE)),
            WATCHDOG_WARNING
          );
        }
      }
      else { $dbxref_status = 1; }
    }
  }

  // create stock
  if ($dbxref_status) {
    $values = array(
      'dbxref_id' => array(
        'db_id' => $node->database,
        'accession' => $node->accession
      ),
      'organism_id' => $node->organism_id,
      'name' => $node->title,
      'uniquename' => $node->uniquename,
      'description' => $node->stock_description,
      'type_id' => $node->type_id
    );
    $stock_status = tripal_core_chado_insert('stock', $values);
  }
  else {
    $values = array(
      'organism_id' => $node->organism_id,
      'name' => $node->title,
      'uniquename' => $node->uniquename,
      'description' => $node->stock_description,
      'type_id' => $node->type_id
    );
    $stock_status = tripal_core_chado_insert('stock', $values);
  }

  // create drupal chado_stock entry
  if ($stock_status) {
    $values = array(
      'organism_id' => $node->organism_id,
      'uniquename' => $node->uniquename,
      'type_id' => $node->type_id
    );
    $chado_stock = tripal_core_chado_select('stock', array('stock_id'), $values);
    if (!empty($chado_stock[0]->stock_id)) {
      db_query(
        "INSERT INTO {chado_stock} (nid, vid, stock_id) "
        ."VALUES (%d, %d, %d)",
        $node->nid,
        $node->vid,
        $chado_stock[0]->stock_id
      );

        //Move on to next stage of Stock Creation based on next_stage_path field
      if ($node->simulate_multipart) {
        $next_stage_path = preg_replace('/%node/', $node->nid, $node->next_step_path);
        $_REQUEST['destination'] = $next_stage_path;
      }
    }
    else {
      drupal_set_message(t('Error during stock creation.'), 'error');
      watchdog('tripal_stock',
        'Insert Stock: Unable to find newly created stock where values:%values',
        array('%values' => print_r($values, TRUE)),
        WATCHDOG_ERROR
      );
      return FALSE;
    }
  }
  else {
    drupal_set_message(t('Error during stock creation.'), 'error');
    watchdog('tripal_stock',
      'Insert Stock: Unable to create stock where values:%values',
      array('%values' => print_r($values, TRUE)),
      WATCHDOG_WARNING
    );
    return FALSE;
  }

}

/**
 * Implements hook_update(): Handles Editing/Updating of main stock info
 *
 * NOTE: Currently just writes over all old data
 *
 * @param $node
 *   The current node including fields with the form element names and submitted values
 *
 * @return
 *   TRUE if the node was successfully updated in drupal/chado; FALSE otherwise
 *
 * @ingroup tripal_stock
 */
function chado_stock_update($node) {

  if ($node->revision) {
    chado_stock_insert($node);
  }
  else {

    //update dbxref
    if ($node->database) {
      if ($node->accession) {
        $dbxref_mode = '';
        $stock = tripal_core_chado_select(
          'stock',
          array('dbxref_id', 'type_id'),
          array('stock_id' => $node->stock_id)
        );

        if ($stock[0]->dbxref_id) {
          $values = array(
            'db_id' => $node->database,
            'accession' => $node->accession,
            'description' => $node->db_description
          );
          $dbxref_status = tripal_core_chado_update(
            'dbxref',
            array('dbxref_id' => $stock[0]->dbxref_id),
            $values
          );
          $dbxref_mode = 'Update';
        }
        else {
          if ($stock[0]->type_id) {
            //create the dbxref
            //used the type_id as a control to check we have a stock but not a dbxref
            $values = array(
              'db_id' => $node->database,
              'accession' => $node->accession,
              'description' => $node->db_description,
              'version' => '1',
            );
            $dbxref_status = tripal_core_chado_insert(
              'dbxref',
              $values
            );
            $dbxref_mode = 'Create';
          }
          else {
            drupal_set_message(t('Unable to find stock to Update'), 'error');
            watchdog(
              'tripal_stock',
              'Stock Update: Unable to find stock to update using values: %values',
              array('%values', print_r($values, TRUE)),
              WATCHDOG_ERROR
            );
            return FALSE;
          }
        }
      }
    }

    if (!$dbxref_status) {
      watchdog(
        'tripal_stock',
        'Stock Update: Unable to %mode main stock dbxref with values: %values',
        array('%values' => print_r($values, TRUE), '%mode' => $dbxref_mode),
        WATCHDOG_WARNING
      );
    }

    //can't change stock id which is all thats stored in drupal thus only update chado
    $update_values = array(
      'organism_id' => $node->organism_id,
      'name' => $node->title,
      'uniquename' => $node->uniquename,
      'description' => $node->stock_description,
      'type_id' => $node->type_id,
    );
    if ($dbxref_status) {
      $update_values['dbxref_id'] = array(
        'db_id' => $node->database,
        'accession' => $node->accession
      );
    }
    $status = tripal_core_chado_update(
      'stock',
      array('stock_id' => $node->stock_id),
      $update_values
    );

    if (!$status) {
      drupal_set_message(t('Unable to update stock'), 'error');
      watchdog(
        'tripal_stock',
        'Stock Update: Unable to update stock using match values: %mvalues and update values: %uvalues',
        array('%mvalues' => print_r(array('stock_id' => $node->stock_id), TRUE), '%uvalues' => print_r($update_values, TRUE)),
        WATCHDOG_ERROR
      );
    }
  }

}

/**
 * Implements hook_delete(): Handles deleting of chado_stocks
 *
 * NOTE: Currently deletes data -no undo or record-keeping functionality
 *
 * @param $node
 *   The current node including fields with the form element names and submitted values
 *
 * @return
 *   TRUE if the node was successfully deleted from drupal/chado; FALSE otherwise
 *
 * @ingroup tripal_stock
 */
function chado_stock_delete($node) {

  // Set stock in chado: is_obsolete = TRUE
  $previous_db = tripal_db_set_active('chado');
  db_query(
    "DELETE FROM {stock} WHERE stock_id=%d",
    $node->stock->stock_id
  );
  tripal_db_set_active($previous_db);

  //remove drupal node and all revisions
  db_query(
    "DELETE FROM {chado_stock} WHERE nid=%d",
    $node->nid
  );
}

/**
 * Purpose: Implement Blocks relating to stock content
 *
 * @param $op
 *   What kind of information to retrieve about the block or blocks.
 *   Possible values include list, configure, save, view.
 * @param $delta
 *   Which block to return (not applicable if $op is 'list').
 * @param $edit
 *   If $op is 'save', the submitted form data from the configuration form.
 *
 * @return
 *   One of the following depending on $op: An array of block descriptions (list), the configuration
 *   form (configure), nothing (save), an array defining subject and content for the block indexed
 *   by $delta (view)
 *
 * @ingroup tripal_stock
 */
function tripal_stock_block($op = 'list', $delta = 0, $edit=array()) {
  switch ($op) {
    case 'list':
      $blocks['base']['info'] = t('Tripal Stock Details');
      $blocks['base']['cache'] = BLOCK_NO_CACHE;

      $blocks['properties']['info'] = t('Tripal Stock Properties');
      $blocks['properties']['cache'] = BLOCK_NO_CACHE;

      $blocks['references']['info'] = t('Tripal Stock References');
      $blocks['references']['cache'] = BLOCK_NO_CACHE;

      $blocks['relationships_as_object']['info'] = t('Tripal Stock Relationships');
      $blocks['relationships_as_object']['cache'] = BLOCK_NO_CACHE;

      $blocks['synonyms']['info'] = t('Tripal Stock Synonyms');
      $blocks['synonyms']['cache'] = BLOCK_NO_CACHE;

      return $blocks;

    case 'view':
      if (user_access('access chado_stock content') and arg(0) == 'node' and is_numeric(arg(1))) {
      $nid = arg(1);
      $node = node_load($nid);

      $block = array();
      switch ($delta) {
        case 'base':
          $block['subject'] = t('Stock Details');
          $block['content'] = theme('tripal_stock_base', $node);
          break;

        case 'properties':
          $block['subject'] = t('Properties');
          $block['content'] = theme('tripal_stock_properties', $node);
          break;

        case 'references':
          $block['subject'] = t('References');
          $block['content'] = theme('tripal_stock_references', $node);
          break;

        case 'relationships':
          $block['subject'] = t('Relationships');
          $block['content'] = theme('tripal_stock_relationships', $node);
          break;

        case 'synonyms':
          $block['subject'] = t('Synonyms');
          $block['content'] = theme('tripal_stock_synonyms', $node);
          break;

      }
        return $block;
      }
  }
}