'list' object is not callable

[kumar-student]

Describe the bug
I tried to impliment admin class for Books table along with ImportExportModelAdmin and ImportExportActionModelAdmin. while exporting selected records from admin panel i got the error.

To Reproduce
Steps to reproduce the behavior:

1. Go to admin.py and impliment custom model admin along with ImportExportModelAdmin and ImportExportActionModelAdmin
2. Got to respective table in admin panel. Select few records and export them as csv file
3. See error

class Base(models.Model):
    slug = models.SlugField(max_length = 200)

    class Meta:
        abstract = True


class Books(Base):
    name = models.CharField('Book name', max_length=100)
    author = models.ForeignKey(Author, blank=True, null=True)
    author_email = models.EmailField('Author email', max_length=75, blank=True)
    imported = models.BooleanField(default=False)
    published = models.DateField('Published', blank=True, null=True)
    price = models.DecimalField(max_digits=10, decimal_places=2, null=True, blank=True)
    categories = models.ManyToManyField(Category, blank=True)

    def __str__(self):
        return self.name


class BaseAdmin(admin.ModelAdmin):
    list_display = ('slug', )


class BooksResource(ModelResource):
    class Meta:
        model = Books


class BooksAdmin(ImportExportModelAdmin, ImportExportActionModelAdmin, BaseAdmin):
    resource_class = [BooksResource]
    list_display = BaseAdmin.list_display + ('name', 'author',  'published', 'price', 'categories', )


admin.site.register(Books, BooksAdmin)

Versions (please complete the following information):

• Django Import Export: [e.g. 3.0.1]
• Python [e.g. 3.9]
• Django [e.g. 4.1]

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context
Add any other context about the problem here.

[kumar-student]

Resolve it by overriding get_data_for_export method in BooksAdmin

class BooksAdmin(ImportExportModelAdmin, ImportExportActionModelAdmin, BaseAdmin):
    resource_class = [BooksResource]
    list_display = BaseAdmin.list_display + ('name', 'author',  'published', 'price', 'categories', )

    def get_data_for_export(self, request, queryset, *args, **kwargs):
        export_form = kwargs.pop('export_form', None)
        return self.choose_export_resource_class(export_form)[0]\
            (**self.get_export_resource_kwargs(request, *args, **kwargs))\
            .export(queryset, *args, **kwargs)

It may not be an optimal solution, but just removed the error from screen and exported csv file.

[matthewhegarty]

Can you provide a stack trace of this issue?

Does it solve your issue if you override get_list_display():

class BooksAdmin(ImportExportModelAdmin, ImportExportActionModelAdmin, BaseAdmin):
    resource_class = [BooksResource]
    
    def get_list_display(self, request):
        return BaseAdmin.list_display + ('name', 'author', 'published', 'price', 'categories',)

[dev-fairshares]

@matthewhegarty I have run into similar problem. I hope this helps you let me know you if you need any further information

Traceback (most recent call last):
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.10/site-packages/django/core/handlers/exception.py", line 55, in inner
    response = get_response(request)
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.10/site-packages/django/core/handlers/base.py", line 197, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.10/site-packages/sentry_sdk/integrations/django/views.py", line 85, in sentry_wrapped_callback
    return callback(request, *args, **kwargs)
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.10/site-packages/django/utils/decorators.py", line 133, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.10/site-packages/django/views/decorators/cache.py", line 62, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.10/site-packages/django/contrib/admin/sites.py", line 242, in inner
    return view(request, *args, **kwargs)
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.10/site-packages/import_export/admin.py", line 733, in export_action
    export_data = self.get_export_data(
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.10/site-packages/import_export/admin.py", line 681, in get_export_data
    data = self.get_data_for_export(request, queryset, *args, **kwargs)
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.10/site-packages/import_export/mixins.py", line 130, in get_data_for_export
    return self.choose_export_resource_class(export_form)

[dev-fairshares]

@matthewhegarty I figured out the above error. that is caused when you pass list to resource_class instead of resource_classes. There should be a type casting enforcing to avoid this kind of errors.

[matthewhegarty]

ok thanks for the report - will take a look

[dev-fairshares]

Hey @matthewhegarty , So recently i have noticed similar error again but this time i made everything correct.I am not sure whats triggering this.Is that i am missing any variable initialization.

Resource

class UserResource(resources.ModelResource):
    class Meta:
        model = User

Admin model

class UserAdmin(ExportActionMixin, ImportExportModelAdmin):
    search_fields = ["first_name", "last_name", "email"]
    list_filter = [
        "last_login",
        "is_superuser",
        "is_active",
        "user_type",
        "marketing",
        "promotional",
    ]
    resource_class = [UserResource]

Register

admin.site.register(User, UserAdmin)

Error Log

  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.11/site-packages/django/core/handlers/exception.py", line 55, in inner
    response = get_response(request)
               ^^^^^^^^^^^^^^^^^^^^^
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.11/site-packages/django/core/handlers/base.py", line 197, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.11/site-packages/sentry_sdk/integrations/django/views.py", line 85, in sentry_wrapped_callback
    return callback(request, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.11/site-packages/django/contrib/admin/options.py", line 686, in wrapper
    return self.admin_site.admin_view(view)(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.11/site-packages/django/utils/decorators.py", line 133, in _wrapped_view
    response = view_func(request, *args, **kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.11/site-packages/django/views/decorators/cache.py", line 62, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.11/site-packages/django/contrib/admin/sites.py", line 242, in inner
    return view(request, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.11/site-packages/import_export/admin.py", line 597, in changelist_view
    return super().changelist_view(request, extra_context)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.11/site-packages/import_export/admin.py", line 763, in changelist_view
    return super().changelist_view(request, extra_context)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.11/site-packages/import_export/admin.py", line 70, in changelist_view
    return super().changelist_view(request, extra_context)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.11/site-packages/django/utils/decorators.py", line 46, in _wrapper
    return bound_method(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.11/site-packages/django/utils/decorators.py", line 133, in _wrapped_view
    response = view_func(request, *args, **kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.11/site-packages/django/contrib/admin/options.py", line 1964, in changelist_view
    response = self.response_action(
               ^^^^^^^^^^^^^^^^^^^^^
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.11/site-packages/django/contrib/admin/options.py", line 1593, in response_action
    response = func(self, request, queryset)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.11/site-packages/import_export/admin.py", line 820, in export_admin_action
    export_data = self.get_export_data(file_format, queryset, request=request, encoding=self.to_encoding)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.11/site-packages/import_export/admin.py", line 681, in get_export_data
    data = self.get_data_for_export(request, queryset, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sheggam/.local/share/virtualenvs/fairshares-backend-CGkGbAnz/lib/python3.11/site-packages/import_export/mixins.py", line 155, in get_data_for_export
    return self.choose_export_resource_class(export_form)\

[matthewhegarty]

resource_class = [UserResource]

Should this be resource_classes?

[dev-fairshares]

You are right. my bad