book: add caching for line

model.py

@@ -7,7 +7,7 @@ from trytond.model import MultiValueMixin, ValueMixin, fields, Unique, Model
 from trytond.transaction import Transaction
 from trytond.pool import Pool
 from trytond.cache import MemoryCache
-from datetime import timedelta, datetime
+from datetime import timedelta
 from decimal import Decimal
 from sql import With, Literal
 from sql.functions import Function
@@ -15,6 +15,7 @@ from sql.conditionals import Coalesce
 
 ENABLE_CACHE = True
 CACHEKEY_CURRENCY = 'currency-%s'
+CACHEKEY_CASHBOOK = 'cashbook-%s'
 
 
 class ArrayAgg(Function):
@@ -140,8 +141,6 @@ class MemCache(Model):
         if ENABLE_CACHE == False:
             return '-'
 
-        dt1 = datetime.now()
-        print('-- get_key_by_record:', name, record.id)
         fname = [name, str(record.id)]
         fname.extend(addkeys)
 
@@ -185,8 +184,6 @@ class MemCache(Model):
 
             if 'cachekey' in line.keys():
                 key = cls.store_value(line['cachekey'], fname[-1])
-
-        print('-- get_key_by_record-END:', datetime.now() - dt1, '-'.join(fname))
         return '-'.join(fname)
 
     @classmethod