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Locking is helpful for preventing race conditions when updating records in the database and ensuring atomic updates.

Sometimes, you may want to share fields and behavior between different models.

十年春，齐师伐我。

increasing subsequence.

relation to itself.

齐宣王 (1) 问曰：“齐桓、晋文之事 (2) ，可得闻乎？

model, on a single association.

山围故国周遭在，潮打空城寂寞回。

杨柳青青江水平，闻郎江上唱歌声。