evaluation - currency filtert ungenutzte währungen + test

currency.py

@@ -0,0 +1,62 @@
+# -*- coding: utf-8 -*-
+# This file is part of the cashbook-module from m-ds for Tryton.
+# The COPYRIGHT file at the top level of this repository contains the
+# full copyright notices and license terms.
+
+from trytond.model import fields
+from trytond.transaction import Transaction
+from trytond.pool import Pool, PoolMeta
+from sql.aggregate import Count
+from sql.conditionals import Case
+
+
+class Currency(metaclass=PoolMeta):
+    __name__ = 'currency.currency'
+
+    cashbook_hasbookings = fields.Function(fields.Boolean(string='Has Bookings',
+        readonly=True), 'on_change_with_cashbook_hasbookings',
+        searcher='search_cashbook_hasbookings')
+
+    @fields.depends('id')
+    def on_change_with_cashbook_hasbookings(self, name=None):
+        """ result: True if there are bookings
+        """
+        Lines = Pool().get('cashbook.line')
+
+        with Transaction().set_context({
+            '_check_access': True,
+            }):
+            if Lines.search_count([
+                ('cashbook.currency.id', '=', self.id),
+                ]) > 0:
+                return True
+        return False
+
+    @classmethod
+    def search_cashbook_hasbookings(cls, name, clause):
+        """ indicate existing bookings
+        """
+        pool = Pool()
+        Currency2 = pool.get('currency.currency')
+        Cashbook = pool.get('cashbook.book')
+        Line = pool.get('cashbook.line')
+        tab_cur = Currency2.__table__()
+        tab_book = Cashbook.__table__()
+        tab_line = Line.__table__()
+        Operator = fields.SQL_OPERATORS[clause[1]]
+
+        query = tab_book.join(tab_line,
+                condition=tab_book.id==tab_line.cashbook,
+            ).join(tab_cur,
+                condition=tab_cur.id==tab_book.currency,
+            ).select(
+                tab_cur.id,
+                having=Operator(Case(
+                        (Count(tab_line.id) > 0, True),
+                        else_ = False,
+                    ), clause[2]),
+                group_by=[tab_cur.id,],
+            )
+        return [('id', 'in', query)]
+
+# end Currency