Setting finished date correctly on tasks

taiga/export_import/api.py

@@ -33,6 +33,7 @@ from taiga.base.api.mixins import CreateModelMixin
 from taiga.base.api.viewsets import GenericViewSet
 from taiga.projects.models import Project, Membership
 from taiga.projects.issues.models import Issue
+from taiga.projects.tasks.models import Task
 from taiga.projects.serializers import ProjectSerializer
 
 from . import mixins
@@ -238,6 +239,9 @@ class ProjectImporterViewSet(mixins.ImportThrottlingPolicyMixin, CreateModelMixi
         project = self.get_object_or_none()
         self.check_permissions(request, 'import_item', project)
 
+        signals.pre_save.disconnect(sender=Task,
+                                    dispatch_uid="set_finished_date_when_edit_task")
+
         task = service.store_task(project, request.DATA.copy())
 
         errors = service.get_errors()

taiga/projects/tasks/apps.py

@@ -23,6 +23,10 @@ from taiga.projects.custom_attributes import signals as custom_attributes_handle
 from . import signals as handlers
 
 def connect_tasks_signals():
+    # Finished date
+    signals.pre_save.connect(handlers.set_finished_date_when_edit_task,
+                             sender=apps.get_model("tasks", "Task"),
+                             dispatch_uid="set_finished_date_when_edit_task")
     # Tags
     signals.pre_save.connect(generic_handlers.tags_normalization,
                              sender=apps.get_model("tasks", "Task"),

taiga/projects/tasks/migrations/0009_auto_20151104_1131.py

@@ -0,0 +1,50 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import connection, migrations, models
+
+def set_finished_date_for_tasks(apps, schema_editor):
+    # Updates the finished date from tasks according to the history_entries associated
+    # It takes the last history change updateing the status of a task and if it's a closed
+    # one it updates the finished_date attribute
+    sql="""
+WITH status_update AS(
+	WITH status_update AS(
+		WITH history_entries AS (
+			SELECT
+				diff#>>'{status, 1}' new_status_id,
+				regexp_split_to_array(key, ':') as split_key,
+				created_at as date
+			FROM history_historyentry
+			WHERE diff#>>'{status, 1}' != ''
+		)
+		SELECT
+			split_key[2] as object_id,
+			new_status_id::int,
+			MAX(date) as status_change_datetime
+		FROM history_entries
+		WHERE split_key[1] = 'tasks.task'
+		GROUP BY object_id, new_status_id, date
+	)
+	SELECT status_update.*
+	FROM status_update
+	INNER JOIN projects_taskstatus
+	ON projects_taskstatus.id = new_status_id AND projects_taskstatus.is_closed = True
+)
+UPDATE tasks_task
+SET finished_date = status_update.status_change_datetime
+FROM status_update
+WHERE tasks_task.id = status_update.object_id::int
+    """
+    cursor = connection.cursor()
+    cursor.execute(sql)
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('tasks', '0008_remove_task_watchers'),
+    ]
+
+    operations = [
+        migrations.RunPython(set_finished_date_for_tasks),
+    ]

taiga/projects/tasks/signals.py

@@ -16,6 +16,7 @@
 
 from contextlib import suppress
 from django.core.exceptions import ObjectDoesNotExist
+from django.utils import timezone
 
 ####################################
 # Signals for cached prev task
@@ -92,3 +93,13 @@ def _try_to_close_milestone_when_delete_task(instance):
     with suppress(ObjectDoesNotExist):
         if instance.milestone_id and services.calculate_milestone_is_closed(instance.milestone):
             services.close_milestone(instance.milestone)
+
+####################################
+# Signals for set finished date
+####################################
+
+def set_finished_date_when_edit_task(sender, instance, **kwargs):
+    if instance.status.is_closed and not instance.finished_date:
+        instance.finished_date = timezone.now()
+    elif not instance.status.is_closed and instance.finished_date:
+        instance.finished_date = None