Use direct access to backend classes

issue8836
review258421002

invoice.py

@@ -735,7 +735,7 @@ class Invoice(Workflow, ModelSQL, ModelView, TaxableMixin):
         invoice_query = Rule.query_get('account.invoice')
         Operator = fields.SQL_OPERATORS[operator]
         # SQLite uses float for sum
-        if backend.name() == 'sqlite':
+        if backend.name == 'sqlite':
             value = float(value)
 
         union = (line.join(invoice, condition=(invoice.id == line.invoice)
@@ -771,7 +771,7 @@ class Invoice(Workflow, ModelSQL, ModelView, TaxableMixin):
         invoice_query = Rule.query_get('account.invoice')
         Operator = fields.SQL_OPERATORS[operator]
         # SQLite uses float for sum
-        if backend.name() == 'sqlite':
+        if backend.name == 'sqlite':
             value = float(value)
 
         query = line.join(invoice,
@@ -800,7 +800,7 @@ class Invoice(Workflow, ModelSQL, ModelView, TaxableMixin):
         invoice_query = Rule.query_get('account.invoice')
         Operator = fields.SQL_OPERATORS[operator]
         # SQLite uses float for sum
-        if backend.name() == 'sqlite':
+        if backend.name == 'sqlite':
             value = float(value)
 
         query = tax.select(tax.invoice,

party.py

@@ -58,8 +58,7 @@ class PartyPaymentTerm(ModelSQL, ValueMixin):
 
     @classmethod
     def __register__(cls, module_name):
-        TableHandler = backend.get('TableHandler')
-        exist = TableHandler.table_exist(cls._table)
+        exist = backend.TableHandler.table_exist(cls._table)
 
         super(PartyPaymentTerm, cls).__register__(module_name)
 

payment_term.py

@@ -251,7 +251,6 @@ class PaymentTermLineRelativeDelta(sequence_ordered(), ModelSQL, ModelView):
 
     @classmethod
     def __register__(cls, module_name):
-        TableHandler = backend.get('TableHandler')
         transaction = Transaction()
         cursor = transaction.connection.cursor()
         pool = Pool()
@@ -267,12 +266,12 @@ class PaymentTermLineRelativeDelta(sequence_ordered(), ModelSQL, ModelView):
         old_model_name = 'account.invoice.payment_term.line.relativedelta'
         old_table = config.get(
             'table', old_model_name, default=old_model_name.replace('.', '_'))
-        if TableHandler.table_exist(old_table):
-            TableHandler.table_rename(old_table, cls._table)
+        if backend.TableHandler.table_exist(old_table):
+            backend.TableHandler.table_rename(old_table, cls._table)
 
         # Migration from 5.0: use ir.calendar
         migrate_calendar = False
-        if TableHandler.table_exist(cls._table):
+        if backend.TableHandler.table_exist(cls._table):
             cursor.execute(*sql_table.select(
                     sql_table.month, sql_table.weekday,
                     where=(sql_table.month != Null)