python - Django 管理站点使用外键将两个模型合并为 1 个模型

Question

我有这张表 StudentProfile

和表StudentEnrollmentRecord，我只想在Student User之前添加一列，如下图所示，

这是我在 model.py 中的代码

class StudentProfile(models.Model):
   LRN = models.CharField(max_length=500,null=True)
   Firstname = models.CharField(max_length=500,null=True,blank=True)
   Middle_Initial = models.CharField(max_length=500,null=True,blank=True)
   Lastname = models.CharField(max_length=500,null=True,blank=True)

class StudentsEnrollmentRecord(models.Model):
    Student_Users = models.ForeignKey(StudentProfile, related_name='+', on_delete=models.CASCADE,null=True)
    School_Year = models.ForeignKey(SchoolYear, related_name='+', on_delete=models.CASCADE, null=True, blank=True)
    Courses = models.ForeignKey(Course, related_name='+', on_delete=models.CASCADE, null=True, blank=True)
    Section = models.ForeignKey(Section, related_name='+', on_delete=models.CASCADE, null=True,blank=True)
    Payment_Type = models.ForeignKey(PaymentType, related_name='+', on_delete=models.CASCADE, null=True)
    Education_Levels = models.ForeignKey(EducationLevel, related_name='+', on_delete=models.CASCADE,blank=True,null=True)

这是我在 admin.py 中的代码

class StudentsEnrollmentRecordAdmin(admin.ModelAdmin):
    list_display = ('Student_Users', 'School_Year', 'Courses', 'Section', 'Payment_Type', 'Education_Levels')
    ordering = ('Education_Levels',)
    list_filter = ('Education_Levels','Section','Student_Users')

Answer 1

您需要在 Admin 类中定义一个单独的函数来从相关对象中检索列:

class StudentsEnrollmentRecordAdmin(admin.ModelAdmin):
    ...
    def lrn(self, obj):
        return obj.Student_Users.lrn

然后在list_display中使用它

list_display = ('lrn', ...)

我还建议使用list_select_lated，这样它就不会查询数据库的每一行。

class StudentsEnrollmentRecordAdmin(admin.ModelAdmin):
    ...
    list_select_related = ('Student_Users')