How do I create a field in Django where I might create only one instance of it. In other words, I don't want that be stored multiple entries of this item in the database, because is only required just one instance. In the administrator interface I might only modify this item, and do not add multiple instances of this.How do I create a field in Django where I might
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如何在Django中创建一个只有一个实例的字段？
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