列出Django ModelAdmin中的相关字段 [英] Listing Related Fields in Django ModelAdmin
问题描述
class MyRelatedModel（models.Model）
name = models.CharField（max_length = 50）
创建= 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']
但是，使用other__name会抛出错误配置错误：
'MyRelatedModelInline.fields'指的是从
中缺少的other__name字段在ModelAdmin中不支持模型遍历语法实例？如果支持，我做错了什么？
编辑：如果我取消注释readonly_fields，错误将变成：
渲染时捕获AttributeError：'MyMainModelAdmin'对象没有属性'__name__'
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
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