在Django ModelAdmin中列出相关字段

I'm listing a model in Django's admin via a TabularInline. Inside this inline, I'd like to use Django's model traversal syntax to list data in other models referenced in the model via foreign keys. e.g.

我通过TabularInline在Django的管理员中列出了一个模型。在这个内联中，我想使用Django的模型遍历语法来列出模型中通过外键引用的其他模型中的数据。例如

class MyRelatedModel(models.Model)
    name = models.CharField(max_length=50)
    created = models.DateField(auto_now_add=True)
    other = models.ForeignKey('MyOtherRelatedModel')

class MyOtherRelatedModel(models.Model)
    name = models.CharField(max_length=50)
    created = models.DateField(auto_now_add=True)

class MyRelatedModelInline(admin.TabularInline):
    model = MyRelatedModel
    fields = ['name', 'created', 'other__name']
    #readonly_fields = ['name', 'created', 'other__name']

However, the usage of 'other__name' throws the ImproperlyConfigured error:

但是，'other__name'的使用会引发ImproperlyConfigured错误：

'MyRelatedModelInline.fields' refers to field 'other__name' that is missing from the form

Is the model traversal syntax not supported in ModelAdmin instances? If it is supported, what am I doing wrong?

ModelAdmin实例中是否不支持模型遍历语法？如果支持，我做错了什么？

EDIT: If I uncomment readonly_fields, the error becomes:

编辑：如果我取消注释readonly_fields，错误变为：

Caught AttributeError while rendering: 'MyMainModelAdmin' object has no attribute '__name__'

1 个解决方案

#1

As per Roseman's suggestion above, you can display related (one-to-one or many-to-one) data in a readonly manner with Inline admin models. Here's a little example, just to make sure that we are all on the same page. You can see below that there are three ways to achieve your goal (if I understand that goal correctly).

根据Roseman上面的建议，您可以使用Inline管理模型以只读方式显示相关（一对一或多对一）数据。这是一个小例子，只是为了确保我们都在同一页面上。您可以在下面看到有三种方法可以实现您的目标（如果我正确理解了这一目标）。

models.py:

models.py：

class Company(models.Model):
    name = models.CharField(max_length=50)

class Employee(models.Model):
    name = models.CharField(max_length=50)
    company = models.ForeignKey('Company')
    car = models.ForeignKey('Car')

    def model_callable(self):
        return self.car.rego

class Car(models.Model):
    rego = models.CharField(max_length=50)

admin.py:

admin.py：

def unbound_callable(emp):
    return emp.car.rego

class EmployeeInline(admin.TabularInline):
    model = Employee
    fields = ('name', 'model_callable', 'model_admin_callable', unbound_callable)
    readonly_fields = ('model_callable', 'model_admin_callable', unbound_callable)

    def model_admin_callable(self, emp):
        return emp.car.rego

class CompanyAdmin(admin.ModelAdmin):
    model = Company
    inlines = (EmployeeInline,)

admin.site.register(Company, CompanyAdmin)

As you can see, 'readonly_fields' is treated in the same manner as 'list_display' as per the Django documentation for contrib.admin (from 1.2 onwards).

如您所见，根据contrib.admin的Django文档（从1.2开始），'readonly_fields'的处理方式与'list_display'相同。

In the above example, when you are editing a Company, you will see its employees inlined. Each row will have an employee name in an editable textbox and next to the name you will see a readonly bit of text for the employee's car's rego (emp.car.rego).

在上面的示例中，当您编辑公司时，您将看到其内联员工。每行在可编辑的文本框中都有一个员工姓名，在名称旁边，您将看到员工汽车的rego（emp.car.rego）的只读文本。

Referring to your original question, you wanted to reference the related data as 'other__name'. This won't work. Expressions like other__name or car__rego only have special meaning as keyword arguments in filters when running Django queries. For example, when fetching an employee who has a car with a particular rego number:

参考您的原始问题，您希望将相关数据引用为“other__name”。这不行。在运行Django查询时，像other__name或car__rego这样的表达式在过滤器中只具有特殊含义作为关键字参数。例如，在获取拥有特定标识号的汽车的员工时：

Employee.objects.filter(car__rego='111')

Hope that helps.

希望有所帮助。

#1