Batch Export of tasks from TaskAdmin Panel (#111)

README.md

@@ -15,6 +15,7 @@ assignment application for Django, designed to be dropped into an existing site
 * Mobile-friendly (work in progress)
 * Separate view for My Tasks (across lists)
 * Batch-import tasks via CSV
+* Batch-export tasks in CSV Format
 * Multiple file attachments per task (see settings)
 * Integrated mail tracking (unify a task list with an email box)
 
@@ -404,4 +405,4 @@ django-todo no longer references a jQuery datepicker, but defaults to native htm
 
 ### URLs
 
-Some views and URLs were renamed for logical consistency. If this affects you, see source code and the demo GTD site for reference to the new URL names.
+Some views and URLs were renamed for logical consistency. If this affects you, see source code and the demo GTD site for reference to the new URL names.

todo/admin.py

@@ -1,13 +1,41 @@
 from django.contrib import admin
 
 from todo.models import Attachment, Comment, Task, TaskList
-
+import csv
+import datetime
+from django.http import HttpResponse
+from django.urls import reverse
+from django.utils.safestring import mark_safe
+
+
+def export_to_csv(modeladmin, request, queryset):
+    opts = modeladmin.model._meta
+    content_disposition = f'attachment; filename={opts.verbose_name}.csv'
+    response = HttpResponse(content_type='text/csv')
+    response['Content-Disposition'] = content_disposition
+    writer = csv.writer(response)
+    fields = [field for field in opts.get_fields() if not field.many_to_many\
+    and not field.one_to_many]
+    # Write a first row with header information
+    writer.writerow([field.verbose_name for field in fields])
+    # Write data rows
+    for obj in queryset:
+        data_row = []
+        for field in fields:
+            value = getattr(obj, field.name)
+            if isinstance(value, datetime.datetime):
+                value = value.strftime('%d/%m/%Y')
+            data_row.append(value)
+        writer.writerow(data_row)
+    return response
+export_to_csv.short_description = 'Export to CSV'
 
 class TaskAdmin(admin.ModelAdmin):
     list_display = ("title", "task_list", "completed", "priority", "due_date")
     list_filter = ("task_list",)
     ordering = ("priority",)
     search_fields = ("title",)
+    actions=[export_to_csv]
 
 
 class CommentAdmin(admin.ModelAdmin):