I want to add a field named 'count' to 'genre' class that gives the count of movies in that genre. I want to add a field named 'count' to 'genre'
阅读背景：
Django Admin面板 - 在'list_display'小部件中添加一个custome字段，该小部件不是模型类的属性（不改变models.py）
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