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A read-only property to entry the file’s relative URL by calling theurl() methodology of the underlyingStorage class. In most cases, this object is not going to have beensaved to the database yet, so if it makes use of thedefault AutoField, it won't yet have avalue for its main key subject. A area for storing periods of time - modeled in Python bytimedelta. When used on PostgreSQL, the data typeused is an interval and on Oracle the data sort is INTERVAL DAY(9) TOSECOND(6). If the associated database isn't shared