function hook_field_storage_write

Write field data for an entity.

This hook is invoked from field_attach_insert() and field_attach_update(), to ask the field storage module to save field data.

Parameters

$entity_type: The entity type of entity, such as 'node' or 'user'.

$entity: The entity on which to operate.

$op: FIELD_STORAGE_UPDATE when updating an existing entity, FIELD_STORAGE_INSERT when inserting a new entity.

$fields: An array listing the fields to be written. The keys and values of the array are field IDs.

Related topics

File

modules/field/field.api.php, line 1852

Code

function hook_field_storage_write($entity_type, $entity, $op, $fields) {
    list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);
    if (!isset($vid)) {
        $vid = $id;
    }
    foreach ($fields as $field_id) {
        $field = field_info_field_by_id($field_id);
        $field_name = $field['field_name'];
        $table_name = _field_sql_storage_tablename($field);
        $revision_name = _field_sql_storage_revision_tablename($field);
        $all_languages = field_available_languages($entity_type, $field);
        $field_languages = array_intersect($all_languages, array_keys((array) $entity->{$field_name}));
        // Delete and insert, rather than update, in case a value was added.
        if ($op == FIELD_STORAGE_UPDATE) {
            // Delete languages present in the incoming $entity->$field_name.
            // Delete all languages if $entity->$field_name is empty.
            $languages = !empty($entity->{$field_name}) ? $field_languages : $all_languages;
            if ($languages) {
                db_delete($table_name)->condition('entity_type', $entity_type)
                    ->condition('entity_id', $id)
                    ->condition('language', $languages, 'IN')
                    ->execute();
                db_delete($revision_name)->condition('entity_type', $entity_type)
                    ->condition('entity_id', $id)
                    ->condition('revision_id', $vid)
                    ->condition('language', $languages, 'IN')
                    ->execute();
            }
        }
        // Prepare the multi-insert query.
        $do_insert = FALSE;
        $columns = array(
            'entity_type',
            'entity_id',
            'revision_id',
            'bundle',
            'delta',
            'language',
        );
        foreach ($field['columns'] as $column => $attributes) {
            $columns[] = _field_sql_storage_columnname($field_name, $column);
        }
        $query = db_insert($table_name)->fields($columns);
        $revision_query = db_insert($revision_name)->fields($columns);
        foreach ($field_languages as $langcode) {
            $items = (array) $entity->{$field_name}[$langcode];
            $delta_count = 0;
            foreach ($items as $delta => $item) {
                // We now know we have something to insert.
                $do_insert = TRUE;
                $record = array(
                    'entity_type' => $entity_type,
                    'entity_id' => $id,
                    'revision_id' => $vid,
                    'bundle' => $bundle,
                    'delta' => $delta,
                    'language' => $langcode,
                );
                foreach ($field['columns'] as $column => $attributes) {
                    $record[_field_sql_storage_columnname($field_name, $column)] = isset($item[$column]) ? $item[$column] : NULL;
                }
                $query->values($record);
                if (isset($vid)) {
                    $revision_query->values($record);
                }
                if ($field['cardinality'] != FIELD_CARDINALITY_UNLIMITED && ++$delta_count == $field['cardinality']) {
                    break;
                }
            }
        }
        // Execute the query if we have values to insert.
        if ($do_insert) {
            $query->execute();
            $revision_query->execute();
        }
    }
}