tx := m.DB.Session(&gorm.Session{})
		if err := m.RunWithValue(values[i], func(stmt *gorm.Statement) error {
			return tx.Exec("DROP TABLE IF EXISTS ?", m.CurrentTable(stmt)).Error
		}); err != nil {
			return err
		}
	}
	return nil
}

// HasTable returns table exists or not for value, value could be a struct or string
func (m Migrator) HasTable(value interface{}) bool {
	var count int64

If it doesn't see an `Authorization` header, or the value doesn't have a `Bearer ` token, it will respond with a 401 status code error (`UNAUTHORIZED`) directly.

You don't even have to check if the token exists to return an error. You can be sure that if your function is executed, it will have a `str` in that token.

You can try it already in the interactive docs:

<img src="/img/tutorial/security/image03.png">

		}

		datas, ok := identityMap[utils.ToStringKey(fieldValues...)]
		if !ok {
			return fmt.Errorf("failed to assign association %#v, make sure foreign fields exists", elem.Interface())
		}

		for _, data := range datas {
			reflectFieldValue := rel.Field.ReflectValueOf(tx.Statement.Context, data)
			if reflectFieldValue.Kind() == reflect.Ptr && reflectFieldValue.IsNil() {

     * Adds a system property to the command list.
     * If the property exists in the system, it uses that value with optional append value.
     * Otherwise, it uses the default value if provided.
     *
     * @param cmdList the command list to add the property to
     * @param name the property name
     * @param defaultValue the default value to use if property doesn't exist
     * @param appendValue the value to append to the property value

        assertArgumentNotNull("rootDir", rootDir);
        assertArgumentNotNull("handler", handler);

        final File packageDir = getPackageDir(rootDir, rootPackage);
        if (packageDir.exists()) {
            traverseFileSystem(packageDir, rootPackage, handler);
        }
    }

    /**
     * Traverses classes contained in a Jar file.
     * <p>

      }
      return null;
    }
  }

  private static final class InCompletionOrderState<T extends @Nullable Object> {
    // A happens-before edge between the writes of these fields and their reads exists, because
    // in order to read these fields, the corresponding write to incompleteOutputCount must have
    // been read.
    private boolean wasCancelled = false;
    private boolean shouldInterrupt = true;

     * @return number of keys in memory
     */
    public int getKeyCount() {
        return sessionKeys.size();
    }

    /**
     * Check if a session key exists
     *
     * @param sessionId session identifier
     * @return true if key exists
     */
    public boolean hasSessionKey(String sessionId) {
        checkNotClosed();

        }

        return abbreviateSite(url);
    }

    /**
     * Puts data into the result data map, handling value appending if configured.
     * If data appending is enabled and the key already exists, values are combined into arrays.
     *
     * @param dataMap the data map to modify
     * @param key the key to store the value under
     * @param value the value to store
     */

    checkNotNull(valueComparator);
    return Comparator.<Optional<T>, @Nullable T>comparing(
        o -> orElseNull(o), Comparator.nullsLast(valueComparator));
  }

  // For discussion of why this exists, see the Android flavor.
  private static <T> @Nullable T orElseNull(Optional<T> optional) {
    return optional.orElse(null);
  }

  /**

        // File system errors
        FILE_NOT_FOUND("File not found", ErrorCategory.FILE_SYSTEM, false), PATH_NOT_FOUND("Path not found", ErrorCategory.FILE_SYSTEM,
                false), FILE_EXISTS("File already exists", ErrorCategory.FILE_SYSTEM, false), DIRECTORY_NOT_EMPTY("Directory not empty",
                        ErrorCategory.FILE_SYSTEM, false), DISK_FULL("Disk full", ErrorCategory.RESOURCE,