Adds contact assignment bulk import (#13109)

* adds contact assignment bulk import #11307

* Remove unsupported tags field added by NetBoxModelImportForm

---------

Co-authored-by: Jeremy Stretch <jstretch@netboxlabs.com>

netbox/tenancy/forms/bulk_import.py

@@ -1,9 +1,11 @@
+from django.contrib.contenttypes.models import ContentType
 from django.utils.translation import gettext as _
 from netbox.forms import NetBoxModelImportForm
 from tenancy.models import *
-from utilities.forms.fields import CSVModelChoiceField, SlugField
+from utilities.forms.fields import CSVContentTypeField, CSVModelChoiceField, SlugField
 
 __all__ = (
+    'ContactAssignmentImportForm',
     'ContactImportForm',
     'ContactGroupImportForm',
     'ContactRoleImportForm',
@@ -81,3 +83,27 @@ class ContactImportForm(NetBoxModelImportForm):
     class Meta:
         model = Contact
         fields = ('name', 'title', 'phone', 'email', 'address', 'link', 'group', 'description', 'comments', 'tags')
+
+
+class ContactAssignmentImportForm(NetBoxModelImportForm):
+    content_type = CSVContentTypeField(
+        queryset=ContentType.objects.all(),
+        help_text=_("One or more assigned object types")
+    )
+    contact = CSVModelChoiceField(
+        queryset=Contact.objects.all(),
+        to_field_name='name',
+        help_text=_('Assigned contact')
+    )
+    role = CSVModelChoiceField(
+        queryset=ContactRole.objects.all(),
+        to_field_name='name',
+        help_text=_('Assigned role')
+    )
+
+    # Remove the tags field added by NetBoxModelImportForm (unsupported by ContactAssignment)
+    tags = None
+
+    class Meta:
+        model = ContactAssignment
+        fields = ('content_type', 'object_id', 'contact', 'priority', 'role')