add constructed bundles to constraints, minor refatoring

app/services/loft_service.py

@@ -63,11 +63,11 @@ class LoftService(Base):
       # create problem
       problem = LpProblem("ata-form-generate", LpMinimize)
 
-      # constraints
+      # form item count constraint
       problem += lpSum([items[item.id]
                     for item in self.solver_run.items]) == self.solver_run.total_form_items, 'Total form items'
 
-      # generic constraints
+      # dynamic constraints
       problem = solver_helper.build_constraints(self.solver_run, problem, items)
 
       # multi-objective functions and constraints
@@ -90,8 +90,7 @@ class LoftService(Base):
 
       # add return items and create as a form
       form_items = service_helper.solution_items(problem.variables(), self.solver_run)
-      # remove items
-      self.solver_run.remove_items(form_items)
+
       # add form to solution
       solution.forms.append(Form.create(form_items, self.solver_run, LpStatus[problem.status]))