asset/onlinesource: add fixed url,

pre defned online sources: add FAZ.net

asset.py

@@ -8,6 +8,7 @@ from trytond.transaction import Transaction
 from trytond.pool import Pool
 from trytond.pyson import Eval, Bool, If, Date
 from trytond.report import Report
+from trytond.exceptions import UserError
 
 from decimal import Decimal
 from datetime import time
@@ -84,8 +85,19 @@ class Asset(SymbolMixin, ModelSQL, ModelView):
         help='Select sources for the course update. The course sources are tried until a valid value has been read.',
         relation_name='investment.asset_source_rel',
         origin='asset', target='source')
-    updtdays = fields.Selection(string='Select days', required=True,
-        selection=sel_updtdays)
+    updturl = fields.Char(
+        string='URL',
+        help='URL for data retrieval.',
+        states={
+            'invisible': Eval('updturl_enable', False) == False,
+            'required': Eval('updturl_enable', False) == True,
+        }, depends=['updturl_enable'])
+    updturl_enable = fields.Function(fields.Boolean(
+        string='URL required', readonly=True,
+        states={'invisible': True}),
+        'on_change_with_updturl_enable')
+    updtdays = fields.Selection(
+        string='Select days', required=True, selection=sel_updtdays)
     updttime = fields.Time(string='Time',
         states={
             'readonly': ~Bool(Eval('updtsources')),
@@ -206,6 +218,16 @@ class Asset(SymbolMixin, ModelSQL, ModelView):
         """
         return 'work'
 
+    @fields.depends('updtsources')
+    def on_change_with_updturl_enable(self, name=None):
+        """ return True if a source has fixed-url
+        """
+        if self.updtsources:
+            for usource in self.updtsources:
+                if usource.fixed_url == True:
+                    return True
+        return False
+
     @fields.depends('updtsources', 'updttime')
     def on_change_updtsources(self):
         """ clear time-fields