Add serial number suggestions

InvenTree/build/forms.py

@@ -53,6 +53,15 @@ class BuildOutputCreateForm(HelperForm):
     Form for creating a new build output.
     """
 
+    def __init__(self, *args, **kwargs):
+
+        build = kwargs.pop('build', None)
+
+        if build:
+            self.field_placeholder['serial_numbers'] = build.part.getSerialNumberString()
+
+        super().__init__(*args, **kwargs)
+
     field_prefix = {
         'serial_numbers': 'fa-hashtag',
     }

InvenTree/build/views.py

@@ -252,11 +252,17 @@ class BuildOutputCreate(AjaxUpdateView):
 
     def get_form(self):
 
-        form = super().get_form()
-
         build = self.get_object()
         part = build.part
 
+        context = self.get_form_kwargs()
+
+        # Pass the 'part' through to the form,
+        # so we can add the next serial number as a placeholder
+        context['build'] = build
+
+        form = self.form_class(**context)
+
         # If the part is not trackable, hide the serial number input
         if not part.trackable:
             form.fields['serial_numbers'].widget = HiddenInput()