prevent redundant invitations for task order officers

atst/models/workspace.py

@@ -63,3 +63,21 @@ class Workspace(Base, mixins.TimestampsMixin, mixins.AuditableMixin):
         return "<Workspace(name='{}', request='{}', user_count='{}', id='{}')>".format(
             self.name, self.request_id, self.user_count, self.id
         )
+
+    def _find_by_role(self, role):
+        try:
+            return [member for member in self.members if member.role.name == role]
+        except StopIteration:
+            return None
+
+    @property
+    def contracting_officer(self):
+        return self._find_by_role("contracting_officer")
+
+    @property
+    def contracting_officer_representative(self):
+        return self._find_by_role("contracting_officer_representative")
+
+    @property
+    def security_officer(self):
+        return self._find_by_role("security_officer")

atst/routes/task_orders/new.py

@@ -112,6 +112,11 @@ class UpdateTaskOrderWorkflow(ShowTaskOrderWorkflow):
     def form(self):
         return self._section["form"](self.form_data)
 
+    @property
+    def workspace(self):
+        if self.task_order:
+            return self.task_order.workspace
+
     def validate(self):
         return self.form.validate()
 
@@ -152,7 +157,11 @@ class UpdateTaskOrderWorkflow(ShowTaskOrderWorkflow):
     def _update_invitations(self):
         for officer_type in self.OFFICER_INVITATIONS:
             field = officer_type["field"]
-            if hasattr(self.form, field) and self.form[field].data:
+            if (
+                hasattr(self.form, field)
+                and self.form[field].data
+                and not getattr(self.workspace, officer_type["role"])
+            ):
                 prefix = officer_type["prefix"]
                 officer_data = {
                     field: getattr(self.task_order, prefix + "_" + field)