在Django admin中使用只读字段时，为什么会出现“ TypeError：元定义类不可迭代”的问题？

Question

I defined my model as following:

from django.db import models

class Books(models.Model):
    name = models.CharField(max_length=100)
    author = models.CharField(max_length=100)

    def __str__(self):
        return str(self.name)

The problem is that when I want to make the author field readonly in admin.py as following:

from django.contrib import admin
from core.models import Books

class Books(admin.ModelAdmin):
    readonly_fields=('author',)

admin.site.register(Books)

I get the following error upon running server:

Answer 1

Use a different name for model class and model admin class

class (admin.ModelAdmin):  # change the model admin class name
    readonly_fields = ('author',)


admin.site.register()