Improved view for creating a new part parameter

- Hide the Part input
- Reduce options based on parameters that already exist!

InvenTree/part/urls.py

@@ -19,7 +19,7 @@ part_attachment_urls = [
 ]
 
 part_parameter_urls = [
-    url('^new/?', views.PartParameterCreate.as_view(), name='part-param-create'),
+    url('^new/', views.PartParameterCreate.as_view(), name='part-param-create'),
 ]
 
 part_detail_urls = [

InvenTree/part/views.py

@@ -1404,6 +1404,47 @@ class PartParameterCreate(AjaxCreateView):
     form_class = part_forms.EditPartParameterForm
     ajax_form_title = 'Create Part Parameter'
 
+    def get_initial(self):
+
+        initials = {}
+
+        part_id = self.request.GET.get('part', None)
+
+        if part_id:
+            try:
+                initials['part'] = Part.objects.get(pk=part_id)
+            except (Part.DoesNotExist, ValueError):
+                pass
+
+        return initials
+
+    def get_form(self):
+        """ Return the form object.
+
+        - Hide the 'Part' field (specified in URL)
+        - Limit the 'Template' options (to avoid duplicates)
+        """
+
+        form = super().get_form()
+
+        part_id = self.request.GET.get('part', None)
+
+        if part_id:
+            try:
+                part = Part.objects.get(pk=part_id)
+
+                form.fields['part'].widget = HiddenInput()
+
+                query = form.fields['template'].queryset
+
+                query = query.exclude(id__in=[param.template.id for param in part.parameters.all()])
+
+                form.fields['template'].queryset = query
+
+            except (Part.DoesNotExist, ValueError):
+                pass
+
+        return form
 
 
 class CategoryDetail(DetailView):