line: calculate quantity on changes in splitlines + tests

todo: tests

line.py

@@ -30,6 +30,14 @@ STATESQ1 = {
 DEPENDSQ1 = ['feature', 'booktransf_feature', 'quantity_digits', 'bookingtype']
 DEPENDSQ1.extend(DEPENDS)
 
+STATESQ1B = {}
+STATESQ1B.update(STATESQ1)
+STATESQ1B['invisible'] = And(
+        Eval('feature', '') != 'asset',
+        Eval('booktransf_feature', '') != 'asset',
+        Eval('splitline_has_quantity', False) == False,
+    )
+
 
 STATESQ2 = {
     'invisible': Eval('feature', '') != 'asset',
@@ -43,7 +51,7 @@ class Line(SecondUomMixin, metaclass=PoolMeta):
 
     quantity = fields.Numeric(string='Quantity',
         digits=(16, Eval('quantity_digits', 4)),
-        states=STATESQ1, depends=DEPENDSQ1)
+        states=STATESQ1B, depends=DEPENDSQ1+['splitline_has_quantity'])
     quantity_credit = fields.Numeric(string='Quantity Credit',
         digits=(16, Eval('quantity_digits', 4)), readonly=True,
         states=STATESQ2, depends=DEPENDSQ2)
@@ -73,6 +81,9 @@ class Line(SecondUomMixin, metaclass=PoolMeta):
             'invisible': Eval('feature', '') != 'asset',
         }, depends=['quantity_digits', 'feature']),
         'on_change_with_quantity_balance')
+    splitline_has_quantity = fields.Function(fields.Boolean(
+        string='has quantity', readonly=True, states={'invisible': True}),
+        'on_change_with_splitline_has_quantity')
 
     def get_rec_name(self, name):
         """ add quantities - if its a asset-cashbook
@@ -165,6 +176,30 @@ class Line(SecondUomMixin, metaclass=PoolMeta):
                     })
         return result
 
+    @fields.depends('amount', 'splitlines', 'quantity')
+    def on_change_splitlines(self):
+        """ update amount if splitlines change
+        """
+        super(Line, self).on_change_splitlines()
+        quantity = sum([x.quantity for x in self.splitlines if x.quantity is not None])
+        cnt1 = sum([1 for x in self.splitlines if x.quantity is not None])
+        if cnt1 > 0:
+            self.quantity = quantity
+
+    @fields.depends('splitlines')
+    def on_change_with_splitline_has_quantity(self, name=None):
+        """ get True if splitlines are linked to asset-cashbooks
+        """
+        result = False
+        for line in self.splitlines:
+            if line.splittype != 'tr':
+                continue
+            if line.booktransf:
+                if line.booktransf.feature == 'asset':
+                    result = True
+                    break
+        return result
+
     @fields.depends('id', 'date', 'cashbook', 'feature',\
         '_parent_cashbook.id', 'reconciliation', \
         '_parent_reconciliation.start_quantity',\