根据上述Roseman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。这里有一个例子，只是为了确保我们都在同一个页面上。你可以在下面看到，有三种实现目标的方法（如果我正确地理解目标）。

models.py：

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

 class Employee（models。模型）
 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：

  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）

 de f model_admin_callable（self，emp）：
 return emp.car.rego 

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

 admin.site.register（Company，CompanyAdmin）
 

当你可以看到，readonly_fields的处理方式与list_display的方式一样，根据contrib.admin的Django文档（从1.2开始）。

在上述示例中，当您编辑公司时，您将看到其员工内联。每行将在可编辑的文本框中具有一个员工名称，并在该名称旁边显示该员工的车辆（emp.car.rego）的只读文本。

参考您的原始问题，您想将相关数据引用为other__name。这不行。在运行Django查询时，诸如 other__name 或 car__rego 的表达式在筛选器中只具有特殊含义作为关键字参数。例如，当获取具有特定号码的汽车的员工时：

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

希望有所帮助。

j

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.

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:

'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?

EDIT: If I uncomment readonly_fields, the error becomes:

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

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).

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:

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).

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).

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:

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

Hope that helps.

j