book: Feld 'start_date' + test,

line: balance-berechnung mit abstimmung gekoppelt + test,
abstimmung: start/enddatum automatisch

line.py

@@ -123,7 +123,10 @@ class Line(Workflow, ModelSQL, ModelView):
     reconciliation = fields.Many2One(string='Reconciliation', readonly=True,
         model_name='cashbook.recon', ondelete='SET NULL',
         domain=[('cashbook.id', '=', Eval('cashbook'))],
-        depends=['cashbook'])
+        depends=['cashbook'],
+        states={
+            'invisible': ~Bool(Eval('reconciliation')),
+        })
 
     balance = fields.Function(fields.Numeric(string='Balance',
         digits=(16, Eval('currency_digits', 2)),
@@ -491,17 +494,44 @@ class Line(Workflow, ModelSQL, ModelView):
         else:
             return 2
 
-    @fields.depends('id', 'cashbook', '_parent_cashbook.start_balance', '_parent_cashbook.id')
+    @fields.depends('id', 'date', 'cashbook', \
+        '_parent_cashbook.start_balance', '_parent_cashbook.id',\
+        'reconciliation', '_parent_reconciliation.start_amount')
     def on_change_with_balance(self, name=None):
-        """ compute balance until current line, with current sort order
+        """ compute balance until current line, with current sort order,
+            try to use a reconciliation as start to speed up calculation
         """
-        Line = Pool().get('cashbook.line')
+        pool = Pool()
+        Reconciliation = pool.get('cashbook.recon')
+        Line = pool.get('cashbook.line')
 
         if self.cashbook:
-            balance = self.cashbook.start_balance
-            lines = Line.search([
+            query = [
                 ('cashbook.id', '=', self.cashbook.id),
-                ])
+                ]
+            balance = self.cashbook.start_balance
+
+            # get existing reconciliation, starting before current line
+            # this will speed up calculation of by-line-balance
+            if self.date is not None:
+                recons = Reconciliation.search([
+                    ('cashbook.id', '=', self.cashbook.id),
+                    ('date_from', '<=', self.date),
+                    ('state', '=', 'done'),
+                    ], order=[('date_from', 'DESC')], limit=1)
+                if len(recons) > 0:
+                    query.extend([
+                            ['OR',
+                                ('date', '>', recons[0].date_from),
+                                [
+                                    ('date', '=', recons[0].date_from),
+                                    ('reconciliation.id', '=',recons[0].id),
+                                ],
+                            ]
+                        ])
+                    balance = recons[0].start_amount
+
+            lines = Line.search(query)
             for line in lines:
                 balance += line.credit - line.debit
                 if line.id == self.id:
@@ -535,6 +565,19 @@ class Line(Workflow, ModelSQL, ModelView):
                     raise ValueError('invalid "bookingtype"')
         return {}
 
+    @classmethod
+    def validate(cls, lines):
+        """ deny date before 'start_date' of cashbook
+        """
+        super(Line, cls).validate(lines)
+        for line in lines:
+            if line.date < line.cashbook.start_date:
+                raise UserError(gettext(
+                    'cashbook.msg_line_date_before_book',
+                    datebook = Report.format_date(line.cashbook.start_date),
+                    recname = line.rec_name,
+                    ))
+
     @classmethod
     def copy(cls, lines, default=None):
         """ reset values
@@ -580,7 +623,7 @@ class Line(Workflow, ModelSQL, ModelView):
         to_write = []
         for lines, values in zip(actions, actions):
             for line in lines:
-                # deny write if chashbook is not open
+                # deny write if cashbook is not open
                 if line.cashbook.state != 'open':
                     raise UserError(gettext(
                         'cashbook.msg_book_deny_write',