(self, key, metafield, value)
Set the meta field for a key to a new value. This triggers the
            on-change handler for existing keys.
Set the meta field for a key to a new value. This triggers the
            on-change handler for existing keys.
Set the meta field for a key to a new value . This triggers the on - change handler for existing keys .
def meta_set(self, key, metafield, value):
        ''' Set the meta field for a key to a new value. This triggers the
            on-change handler for existing keys. '''
        self._meta.setdefault(key, {})[metafield] = value
        if key in self:
            self[key] = self[key]
def meta_set ( self , key , metafield , value ) : self . _meta . setdefault ( key , { } ) [ metafield ] = value if key in self : self [ key ] = self [ key ]