Q:

'MediaDefiningClass' object is not iterable - django-import-export

I have a django app I am working on and in the admin page, I'd like to be able to export a model's list view as csv, xls and multiple other file formats. I'm using django-import-export package for that. I have installed and added it to my installed apps in settings.py.
In my models.py I have..
class Student(models.Model):
  firstname = models.CharField(max_length=20)
  middlename = models.CharField(max_length=20)
  lastname = models.CharField(max_length=20)
  admission_number = models.CharField(max_length=10)
  grade = models.CharField(max_length=10)
  joined = models.DateField(auto_now_add=True)

  def __str__(self):
    return f'{self.firstname} {self.lastname}'

My admin.py file
class StudentAdmin(admin.ModelAdmin):
  list_display = ('firstname', 'lastname', 'admission_number', 'grade', 'joined')
  list_filter = ('grade', 'joined',)

admin.site.register(Student, StudentAdmin)

To handle the import and export functionality, I have created a file in the same directory called resource.py where I have the following django-import-export specific code.
from import_export import resources
from import_exports.fields import Field
from .models import Student

class StudentResource(resources.ModelResource):
  full_name = Field(column_name='name')

  class Meta:
    model = Student
    fields = ('full_name', 'admission_number', 'grade', 'joined')
    widgets = {
      'joined': { 'format': '%d/%m/%Y'},
    }

  def dehydrate_full_name(self, student):
    return f'{student.firstname} {student.middlename} {student.lastname}'

As you can see from the above code, I have created a new field full_name which I want to hold the full name of a student under the column name and I'd like it exported that way.
I would like to be able to export the data via an admin action and after reading through django-import-export documentation, I updated my admin.py file..
# Added these imports
from import_export.admin import ImportExportActionModelAdmin
from .resource import StudentResource

class StudentExportAdmin(ImportExportActionModelAdmin):
    resource_class = StudentResource

class StudentAdmin(admin.ModelAdmin):
  list_display = ('firstname', 'lastname', 'admission_number', 'grade', 'joined')
  list_filter = ('grade', 'joined',)

admin.site.register(Student, StudentAdmin)
admin.site.register(StudentExportAdmin)

What am I doing wrong here? Someone please help.

A:

change according to this, 
class StudentAdmin(ImportExportActionModelAdmin):
  resource_class = StudentResource
  list_display = ('firstname', 'lastname', 'admission_number', 'grade', 'joined')
  list_filter = ('grade', 'joined',)

admin.site.register(Student,StudentAdmin)

remove this line, as import-export will automatically place it in the admin panel according to the resources you have used.

