added a presave signal for travel model to update own field with foreign key project field

input/admin.py

@@ -32,7 +32,7 @@ class ProjectAdmin(admin.ModelAdmin):
     search_fields = ('name', 'pid','finance_id', 'realname', 'start', 'end', 'participants_estimated', 'participants_real', 'cost', 'status')
     list_display = ('name', 'pid','finance_id', 'realname', 'start', 'end', 'participants_estimated', 'participants_real', 'cost', 'status')
     #    action = ['export_as_csv']
-    date_hierarchy = 'start'
+    date_hierarchy = 'end'
 
 
 @admin.register(BusinessCard)

input/forms.py

@@ -66,6 +66,7 @@ class TravelForm(FdbForm):
         self.fields['checkin'].required = True
         self.fields['checkout'].required = True
         self.fields['hotel'].required = True
+        self.fields['project_end'].required = False
 
     class Meta:
         model = Travel

input/migrations/0084_travel_project_end.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.1.2 on 2022-12-05 18:15
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('input', '0083_auto_20221205_0946'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='travel',
+            name='project_end',
+            field=models.DateField(null=True, verbose_name='Projektende'),
+        ),
+    ]

input/migrations/0085_auto_20221205_1820.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.1.2 on 2022-12-05 18:20
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('input', '0084_travel_project_end'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='travel',
+            name='project_end',
+            field=models.DateField(blank=True, null=True, verbose_name='Projektende'),
+        ),
+    ]

input/models.py

@@ -87,9 +87,10 @@ class Project(Volunteer):
     notes = models.TextField(max_length=1000,null=True,blank=True,verbose_name='Anmerkungen')
     intern_notes = models.TextField(max_length=1000, blank=True, verbose_name="interne Anmerkungen")
     
+    end_mail_send = models.BooleanField(null=True, verbose_name='Endmail versenden')
+
     # the following Fields are not supposed to be edited by users
     pid = models.CharField(max_length=15, null=True, blank=True)
-    end_mail_send = models.BooleanField(null=True, verbose_name='Endmail versenden')
     status = models.CharField(max_length=3,choices=(('RUN', 'läuft'),('END','beendet'),('NOT','nicht stattgefunden')),default='RUN')
     persons = models.IntegerField(default=1)
     finance_id = models.CharField(max_length=15, null= True, blank=True)
@@ -149,6 +150,8 @@ TRANSPORT_CHOICES = {'BAHN': 'Bahn',
 PAYEDBY_CHOICES = {'WMDE': 'WMDE',
                    'REQU': 'Antragstellender Mensch'}
 
+from django.contrib.contenttypes.models import ContentType
+
 class Travel(Volunteer):
     # project variable is now null true and blank true, which means it can be saved without project id to be later on filled out by admins
     project = models.ForeignKey(Project, on_delete=models.CASCADE, null=True, blank=True)
@@ -164,6 +167,26 @@ class Travel(Volunteer):
     notes = models.TextField(max_length=1000, blank=True, verbose_name='Anmerkungen')
     request_url = models.URLField(max_length=2000, verbose_name='Antrag (URL)')
     intern_notes = models.TextField(max_length=1000, blank=True, verbose_name='interne Anmerkungen')
+    project_end = models.DateField(blank=True, null=True, verbose_name='Projektende')
+    # use content type model to get the end date for the project foreign key
+    
+
+from django.db.models.signals import pre_save
+from django.dispatch import receiver
+
+@receiver(pre_save, sender=Travel, dispatch_uid="get_project_end")
+def getProjectEnd(sender, instance, **kwargs):
+    #instance.project_end = instance.project.end
+    instance.project_end = instance.project.end
+
+
+#    def save(self,*args,**kwargs):
+#        '''we generate the autogenerated fields here'''
+#        # we don't call save with args/kwargs to avoid UNIQUE CONSTRAINT errors
+#        # but maybe there is a better solution?
+#        intern_notes
+#        project_end = self.checkout
+#        super(Travel, self).save(*args,**kwargs)
 
 #abstract base class for Library and IFG
 class Grant(Extern):