Build can be "unallocated" against a single build output

InvenTree/build/forms.py

@@ -46,6 +46,25 @@ class EditBuildForm(HelperForm):
         ]
 
 
+class UnallocateBuildForm(HelperForm):
+    """
+    Form for auto-de-allocation of stock from a build
+    """
+
+    confirm = forms.BooleanField(required=False, help_text=_('Confirm unallocation of stock'))
+
+    output_id = forms.IntegerField(
+        required=False,
+        widget=forms.HiddenInput()
+    )
+
+    class Meta:
+        model = Build
+        fields = [
+            'confirm',
+        ]
+
+
 class ConfirmBuildForm(HelperForm):
     """ Form for auto-allocation of stock to a build """
 

InvenTree/build/models.py

@@ -363,10 +363,22 @@ class Build(MPTTModel):
         return allocations
 
     @transaction.atomic
-    def unallocateStock(self):
-        """ Deletes all stock allocations for this build. """
+    def unallocateStock(self, output=None):
+        """
+        Deletes all stock allocations for this build.
+        
+        Args:
+            output: Specify which build output to delete allocations (optional)
 
-        BuildItem.objects.filter(build=self.id).delete()
+        """
+
+        allocations = BuildItem.objects.filter(build=self.pk)
+
+        if output:
+            allocations = allocations.filter(install_into=output.pk)
+
+        # Remove all the allocations
+        allocations.delete()
 
     @transaction.atomic
     def autoAllocate(self):
@@ -682,6 +694,8 @@ class BuildItem(models.Model):
 
     def complete_allocation(self, user):
 
+        # TODO : This required much reworking!!
+
         item = self.stock_item
 
         # Split the allocated stock if there are more available than allocated

InvenTree/build/views.py

@@ -148,11 +148,29 @@ class BuildUnallocate(AjaxUpdateView):
     """
 
     model = Build
-    form_class = forms.ConfirmBuildForm
+    form_class = forms.UnallocateBuildForm
     ajax_form_title = _("Unallocate Stock")
     ajax_template_name = "build/unallocate.html"
     form_required = 'build.change'
 
+    def get_initial(self):
+
+        initials = super().get_initial()
+
+        # Pointing to a particular build output?
+        output = self.get_param('output')
+
+        if output:
+            try:
+                output = StockItem.objects.get(pk=output)
+            except (ValueError, StockItem.DoesNotExist):
+                output = None
+
+        if output:
+            initials['output_id'] = output.pk
+
+        return initials
+
     def post(self, request, *args, **kwargs):
 
         build = self.get_object()
@@ -160,13 +178,20 @@ class BuildUnallocate(AjaxUpdateView):
         
         confirm = request.POST.get('confirm', False)
 
+        output_id = request.POST.get('output_id', None)
+
+        try:
+            output = StockItem.objects.get(pk=output_id)
+        except (ValueError, StockItem.DoesNotExist):
+            output = None
+
         valid = False
 
         if confirm is False:
             form.errors['confirm'] = [_('Confirm unallocation of build stock')]
             form.non_field_errors = [_('Check the confirmation box')]
         else:
-            build.unallocateStock()
+            build.unallocateStock(output=output)
             valid = True
 
         data = {