Doctrine\ODM\MongoDB\Mapping\MappingException::duplicateFieldMapping PHP Метод

    public static function duplicateFieldMapping($document, $fieldName)
    {
        return new self('Property "' . $fieldName . '" in "' . $document . '" was already declared, but it must be declared only once');
    }

 /**
  * Map a field.
  *
  * @param array $mapping The mapping information.
  */
 public function mapField(array $mapping)
 {
     if (!isset($mapping['fieldName']) && isset($mapping['name'])) {
         $mapping['fieldName'] = $mapping['name'];
     }
     if (!isset($mapping['fieldName'])) {
         throw MappingException::missingFieldName($this->name);
     }
     if (!isset($mapping['name'])) {
         $mapping['name'] = $mapping['fieldName'];
     }
     if (isset($this->fieldMappings[$mapping['fieldName']])) {
         throw MappingException::duplicateFieldMapping($this->name, $mapping['fieldName']);
     }
     if ($this->discriminatorField['name'] === $mapping['fieldName']) {
         throw MappingException::duplicateFieldMapping($this->name, $mapping['fieldName']);
     }
     if (isset($mapping['targetDocument']) && strpos($mapping['targetDocument'], '\\') === false && strlen($this->namespace)) {
         $mapping['targetDocument'] = $this->namespace . '\\' . $mapping['targetDocument'];
     }
     if (isset($mapping['discriminatorMap'])) {
         foreach ($mapping['discriminatorMap'] as $key => $class) {
             if (strpos($class, '\\') === false && strlen($this->namespace)) {
                 $mapping['discriminatorMap'][$key] = $this->namespace . '\\' . $class;
             }
         }
     }
     if (isset($mapping['cascade']) && is_string($mapping['cascade'])) {
         $mapping['cascade'] = array($mapping['cascade']);
     }
     if (isset($mapping['cascade']) && in_array('all', (array) $mapping['cascade'])) {
         unset($mapping['cascade']);
         $default = true;
     } else {
         $default = false;
     }
     $mapping['isCascadeRemove'] = $default;
     $mapping['isCascadePersist'] = $default;
     $mapping['isCascadeRefresh'] = $default;
     $mapping['isCascadeMerge'] = $default;
     $mapping['isCascadeDetach'] = $default;
     $mapping['isCascadeCallbacks'] = $default;
     if (isset($mapping['cascade']) && is_array($mapping['cascade'])) {
         foreach ($mapping['cascade'] as $cascade) {
             $mapping['isCascade' . ucfirst($cascade)] = true;
         }
     }
     unset($mapping['cascade']);
     if (isset($mapping['file']) && $mapping['file'] === true) {
         $this->file = $mapping['fieldName'];
         $mapping['name'] = 'file';
     }
     if (isset($mapping['distance']) && $mapping['distance'] === true) {
         $this->distance = $mapping['fieldName'];
     }
     if (isset($mapping['id']) && $mapping['id'] === true) {
         $mapping['name'] = '_id';
         $mapping['type'] = isset($mapping['type']) ? $mapping['type'] : 'id';
         $this->identifier = $mapping['fieldName'];
         if (isset($mapping['strategy'])) {
             $generatorType = constant('Doctrine\\ODM\\MongoDB\\Mapping\\ClassMetadata::GENERATOR_TYPE_' . strtoupper($mapping['strategy']));
             if ($generatorType !== self::GENERATOR_TYPE_AUTO) {
                 $mapping['type'] = 'custom_id';
             }
             $this->generatorType = $generatorType;
             $this->generatorOptions = isset($mapping['options']) ? $mapping['options'] : array();
         }
     }
     if (!isset($mapping['nullable'])) {
         $mapping['nullable'] = false;
     }
     if (isset($mapping['reference']) && $mapping['type'] === 'one') {
         $mapping['association'] = self::REFERENCE_ONE;
     }
     if (isset($mapping['reference']) && $mapping['type'] === 'many') {
         $mapping['association'] = self::REFERENCE_MANY;
     }
     if (isset($mapping['embedded']) && $mapping['type'] === 'one') {
         $mapping['association'] = self::EMBED_ONE;
     }
     if (isset($mapping['embedded']) && $mapping['type'] === 'many') {
         $mapping['association'] = self::EMBED_MANY;
     }
     /*
     if (isset($mapping['type']) && ($mapping['type'] === 'one' || $mapping['type'] === 'many')) {
         $mapping['type'] = $mapping['type'] === 'one' ? self::ONE : self::MANY;
     }
     */
     if (isset($mapping['version'])) {
         $mapping['notSaved'] = true;
         $this->setVersionMapping($mapping);
     }
     if (isset($mapping['lock'])) {
         $mapping['notSaved'] = true;
         $this->setLockMapping($mapping);
     }
     $mapping['isOwningSide'] = true;
     $mapping['isInverseSide'] = false;
     if (isset($mapping['reference'])) {
         if (isset($mapping['inversedBy']) && $mapping['inversedBy']) {
             $mapping['isOwningSide'] = true;
             $mapping['isInverseSide'] = false;
         }
         if (isset($mapping['mappedBy']) && $mapping['mappedBy']) {
             $mapping['isInverseSide'] = true;
             $mapping['isOwningSide'] = false;
         }
     }
     $this->fieldMappings[$mapping['fieldName']] = $mapping;
     return $mapping;
 }