Add __table_handler__ to ModelSQL

issue7581
review48531002

account.py

@@ -11,7 +11,6 @@ from trytond.pyson import Eval, If, Bool
 from trytond.pool import Pool, PoolMeta
 from trytond.tools import grouped_slice
 from trytond.transaction import Transaction
-from trytond import backend
 
 __all__ = ['FiscalYear',
     'Period', 'Move', 'MoveLine', 'Reconciliation', 'InvoiceSequence',
@@ -30,7 +29,6 @@ class FiscalYear(metaclass=PoolMeta):
 
     @classmethod
     def __register__(cls, module_name):
-        TableHandler = backend.get('TableHandler')
         pool = Pool()
         Sequence = pool.get('account.fiscalyear.invoice_sequence')
         sequence = Sequence.__table__()
@@ -38,7 +36,7 @@ class FiscalYear(metaclass=PoolMeta):
 
         super(FiscalYear, cls).__register__(module_name)
         cursor = Transaction().connection.cursor()
-        table = TableHandler(cls, module_name)
+        table = cls.__table_handler__(module_name)
 
         # Migration from 4.2: Use Match pattern for sequences
         if (table.column_exist('in_invoice_sequence')
@@ -76,7 +74,6 @@ class Period(metaclass=PoolMeta):
 
     @classmethod
     def __register__(cls, module_name):
-        TableHandler = backend.get('TableHandler')
         pool = Pool()
         Sequence = pool.get('account.fiscalyear.invoice_sequence')
         FiscalYear = pool.get('account.fiscalyear')
@@ -86,7 +83,7 @@ class Period(metaclass=PoolMeta):
 
         super(Period, cls).__register__(module_name)
         cursor = Transaction().connection.cursor()
-        table = TableHandler(cls, module_name)
+        table = cls.__table_handler__(module_name)
 
         # Migration from 4.2: Use Match pattern for sequences
         if (table.column_exist('in_invoice_sequence')

invoice.py

@@ -323,7 +323,6 @@ class Invoice(Workflow, ModelSQL, ModelView, TaxableMixin):
         pool = Pool()
         Line = pool.get('account.invoice.line')
         Tax = pool.get('account.invoice.tax')
-        TableHandler = backend.get('TableHandler')
         sql_table = cls.__table__()
         line = Line.__table__()
         tax = Tax.__table__()
@@ -331,7 +330,7 @@ class Invoice(Workflow, ModelSQL, ModelView, TaxableMixin):
         super(Invoice, cls).__register__(module_name)
         transaction = Transaction()
         cursor = transaction.connection.cursor()
-        table = TableHandler(cls, module_name)
+        table = cls.__table_handler__(module_name)
 
         # Migration from 1.2 invoice_date is no more required
         table.not_null_action('invoice_date', action='remove')
@@ -1756,11 +1755,10 @@ class InvoiceLine(sequence_ordered(), ModelSQL, ModelView, TaxableMixin):
         pool = Pool()
         Invoice = pool.get('account.invoice')
         invoice = Invoice.__table__()
-        TableHandler = backend.get('TableHandler')
         sql_table = cls.__table__()
         super(InvoiceLine, cls).__register__(module_name)
         cursor = Transaction().connection.cursor()
-        table = TableHandler(cls, module_name)
+        table = cls.__table_handler__(module_name)
 
         # Migration from 1.0 invoice is no more required
         table.not_null_action('invoice', action='remove')
@@ -2243,11 +2241,10 @@ class InvoiceTax(sequence_ordered(), ModelSQL, ModelView):
 
     @classmethod
     def __register__(cls, module_name):
-        TableHandler = backend.get('TableHandler')
-        table = TableHandler(cls, module_name)
-
         super(InvoiceTax, cls).__register__(module_name)
 
+        table = cls.__table_handler__(module_name)
+
         # Migration from 2.4: drop required on sequence
         table.not_null_action('sequence', action='remove')
 

payment_term.py

@@ -140,11 +140,10 @@ class PaymentTermLine(sequence_ordered(), ModelSQL, ModelView):
 
     @classmethod
     def __register__(cls, module_name):
-        TableHandler = backend.get('TableHandler')
         sql_table = cls.__table__()
         super(PaymentTermLine, cls).__register__(module_name)
         cursor = Transaction().connection.cursor()
-        table = TableHandler(cls, module_name)
+        table = cls.__table_handler__(module_name)
 
         # Migration from 1.0 percent change into percentage
         if table.column_exist('percent'):
@@ -341,7 +340,7 @@ class PaymentTermLineRelativeDelta(sequence_ordered(), ModelSQL, ModelView):
 
         super(PaymentTermLineRelativeDelta, cls).__register__(module_name)
 
-        line_table = TableHandler(Line, module_name)
+        line_table = Line.__table_handler__(module_name)
 
         # Migration from 3.4
         fields = ['day', 'month', 'weekday', 'months', 'weeks', 'days']