Add remaining deletion rules

Fixes #2511, #1431

Author: melton-jason

specifyweb/specify/build_models.py

@@ -97,7 +97,7 @@ def make_relationship(modelname : str, rel: Relationship, datamodel: Datamodel)
         return None
 
     try:
-        on_delete = SPECIAL_DELETION_RULES[f"{modelname}"][f"{rel.name.lower()}"]
+        on_delete = SPECIAL_DELETION_RULES[f'{modelname.capitalize()}.{rel.name.lower()}']
     except KeyError:
         reverse = datamodel.reverse_relationship(rel)
 

specifyweb/specify/deletion_rules.py

@@ -21,6 +21,8 @@
 """
 SPECIAL_DELETION_RULES = {
     'Agent.specifyuser' : models.SET_NULL,
+    'Borrow.addressOfRecord' : models.SET_NULL,
+    'Loanpreparation.preparation' : models.SET_NULL,
 
      # Handle workbench deletion using raw sql in business rules.
     'Workbenchrow.workbench': models.DO_NOTHING,