Support cascade deletion

api/s4_tanks.py

@@ -1,4 +1,4 @@
-from .operation import *
+from .database import *
 from .s0_base import *
 from .s24_coordinates import *
 
@@ -75,7 +75,7 @@ class Tank(object):
         return { 'type': self.type, 'id': self.id }
 
 
-def set_tank_cache(name: str, cs: ChangeSet) -> DbChangeSet:
+def set_tank_cmd(name: str, cs: ChangeSet) -> DbChangeSet:
     old = Tank(get_tank(name, cs.operations[0]['id']))
     raw_new = get_tank(name, cs.operations[0]['id'])
 
@@ -99,10 +99,10 @@ def set_tank_cache(name: str, cs: ChangeSet) -> DbChangeSet:
 
 
 def set_tank(name: str, cs: ChangeSet) -> ChangeSet:
-    return execute_command(name, set_tank_cache(name, cs))
+    return execute_command(name, set_tank_cmd(name, cs))
 
 
-def add_tank_cache(name: str, cs: ChangeSet) -> DbChangeSet:
+def add_tank_cmd(name: str, cs: ChangeSet) -> DbChangeSet:
     new = Tank(cs.operations[0])
 
     redo_sql = f"insert into _node (id, type) values ({new.f_id}, {new.f_type});"
@@ -120,10 +120,10 @@ def add_tank_cache(name: str, cs: ChangeSet) -> DbChangeSet:
 
 
 def add_tank(name: str, cs: ChangeSet) -> ChangeSet:
-    return execute_command(name, add_tank_cache(name, cs))
+    return execute_command(name, add_tank_cmd(name, cs))
 
 
-def delete_tank_cache(name: str, cs: ChangeSet) -> DbChangeSet:
+def delete_tank_cmd(name: str, cs: ChangeSet) -> DbChangeSet:
     old = Tank(get_tank(name, cs.operations[0]['id']))
 
     redo_sql = f"delete from coordinates where node = {old.f_id};"
@@ -141,7 +141,7 @@ def delete_tank_cache(name: str, cs: ChangeSet) -> DbChangeSet:
 
 
 def delete_tank(name: str, cs: ChangeSet) -> ChangeSet:
-    return execute_command(name, delete_tank_cache(name, cs))
+    return execute_command(name, delete_tank_cmd(name, cs))
 
 
 class InpTank:
@@ -191,3 +191,13 @@ def inp_out_tank(name: str) -> list[str]:
         desc = ';'
         lines.append(f'{id} {elevation} {init_level} {min_level} {max_level} {diameter} {min_vol} {vol_curve} {overflow} {desc}')
     return lines
+
+
+def unset_tank_by_curve(name: str, curve: str) -> ChangeSet:
+    cs = ChangeSet()
+
+    rows = read_all(name, f"select id from tanks where vol_curve = '{curve}'")
+    for row in rows:
+        cs.append(g_update_prefix | {'type': 'tank', 'id': row['id'], 'vol_curve': None})
+
+    return cs