[Answered ]-Is it possible to change the status of filefield in admin – DJANGO

With models.FileField in your Student model you can add only one file for each student. Every new upload replaces the old file. That is why in the admin you only see the file that is currently in the database. If you want to add more than one file for each student, you need to use ForeignKey and Inline. Here is an example (you need to adjust it to work with your ImportExportModelAdmin class):

models.py

class Student(models.Model):
    name = models.CharField(max_length=400, null=True, blank=True)
    codePerm = models.CharField(max_length=200, null=True)

class StudentFiles(models.Model):
    student = models.ForeignKey('Student',
        on_delete=models.CASCADE,
        related_name='files'
    )
    file = models.FileField()

admin.py

from .models import Student, StudentFiles

class StudentFilesInline(admin.TabularInline):
    model = StudentFiles

@admin.register(Student)
class StudentAdmin(admin.ModelAdmin):           
        inlines = [StudentFilesInline,]

Now if you want to upload multiple files at once, you are going to need a custom form field for this. I find this tutorial helpful. For example, you can create forms.py in your app and add this code:

forms.py

from django import forms
from .models import Student, StudentFiles

class StudentAdminForm(forms.ModelForm):
    class Meta:
        model = Student
        # Display all default fields without change
        fields = '__all__'
    
    # Create a new field with 'multiple' attribute
    files = forms.FileField(
        widget=forms.ClearableFileInput(attrs={'multiple': True}),
        label='Upload multiple files at once',
        required=False,
    )

    def save_files(self, student):
        # Save each file in the StudentFiles model
        for upload in self.files.getlist('files'):
            file = StudentFiles(student=student, file=upload)
            file.save()

And then adjust the admin.py accordingly:

from django.contrib import admin
from .models import Student, StudentFiles
from .forms import StudentAdminForm

class StudentFilesInline(admin.TabularInline):
    model = StudentFiles

@admin.register(Student)
class StudentAdmin(admin.ModelAdmin):         
    inlines = [StudentFilesInline,]
    form = StudentAdminForm

    def save_related(self, request, form, formsets, change):
        super().save_related(request, form, formsets, change)
        form.save_files(form.instance)

With all of this you will be able to upload many files at once and later replace/delete any of them.

EDIT: There is a simpler way explained in this Quora post. You can get rid of the save_files() and save_related(). Use save_model() instead:

forms.py

from django import forms
from .models import Student

class StudentAdminForm(forms.ModelForm):
    class Meta:
        model = Student
        # Display all default fields without change
        fields = '__all__'

    # Create a new field with 'multiple' attribute
    files = forms.FileField(
        widget=forms.ClearableFileInput(attrs={'multiple': True}),
        label='Upload multiple files at once',
        required=False,
    )

admin.py

from django.contrib import admin
from .models import Student, StudentFiles
from .forms import StudentAdminForm

class StudentFilesInline(admin.TabularInline):
    model = StudentFiles

@admin.register(Student)
class StudentAdmin(admin.ModelAdmin):         
    inlines = [StudentFilesInline,]
    form = StudentAdminForm

    def save_model(self, request, obj, form, change): 
        obj.save() 
 
        for file in request.FILES.getlist('files'): 
            obj.files.create(file=file)