Added optional serverside processing on datatables that lists all tickets - True by default

helpdesk/lib.py

@@ -21,6 +21,8 @@ from helpdesk.models import Attachment, EmailTemplate
 
 import six
 
+from model_utils import Choices
+
 if six.PY3:
     from base64 import encodebytes as b64encode
     from base64 import decodebytes as b64decode
@@ -329,3 +331,58 @@ def process_attachments(followup, attached_files):
                 attachments.append([filename, att.file])
 
     return attachments
+
+
+ORDER_COLUMN_CHOICES = Choices(
+    ('0', 'id'),
+    ('2', 'priority'),
+    ('3', 'title'),
+    ('4', 'queue'),
+    ('5', 'status'),
+    ('6', 'created'),
+    ('7', 'due_date'),
+    ('8', 'assigned_to')
+)
+
+def query_tickets_by_args(objects, order_by, **kwargs):
+    """
+    This function takes in a list of ticket objects from the views and throws it
+    to the datatables on ticket_list.html. If a search string was entered, this
+    function filters existing dataset on search string and returns a filtered
+    filtered list. The `draw`, `length` etc parameters are for datatables to
+    display meta data on the table contents. The returning queryset is passed
+    to a Serializer called TicketSerializer in serializers.py.
+    """
+    draw = int(kwargs.get('draw', None)[0])
+    length = int(kwargs.get('length', None)[0])
+    start = int(kwargs.get('start', None)[0])
+    search_value = kwargs.get('search[value]', None)[0]
+    order_column = kwargs.get('order[0][column]', None)[0]
+    order = kwargs.get('order[0][dir]', None)[0]
+
+    order_column = ORDER_COLUMN_CHOICES[order_column]
+    # django orm '-' -> desc
+    if order == 'desc':
+        order_column = '-' + order_column
+
+    queryset = objects.all().order_by(order_by)
+    total = queryset.count()
+
+    if search_value:
+        queryset = queryset.filter(Q(id__icontains=search_value) |
+                                    Q(priority__icontains=search_value) |
+                                    Q(title__icontains=search_value) |
+                                    Q(queue__title__icontains=search_value) |
+                                    Q(status__icontains=search_value) |
+                                    Q(created__icontains=search_value) |
+                                    Q(due_date__icontains=search_value) |
+                                    Q(assigned_to__email__icontains=search_value))
+
+    count = queryset.count()
+    queryset = queryset.order_by(order_column)[start:start + length]
+    return {
+        'items': queryset,
+        'count': count,
+        'total': total,
+        'draw': draw
+}

helpdesk/serializers.py

@@ -0,0 +1,48 @@
+from rest_framework import serializers
+
+from .models import Ticket
+
+from django.contrib.humanize.templatetags import humanize
+
+"""
+A serializer for the Ticket model, returns data in the format as required by
+datatables for ticket_list.html. Called from staff.datatables_ticket_list.
+
+"""
+
+class TicketSerializer(serializers.ModelSerializer):
+    ticket = serializers.SerializerMethodField()
+    assigned_to = serializers.SerializerMethodField()
+    created = serializers.SerializerMethodField()
+    due_date = serializers.SerializerMethodField()
+    status = serializers.SerializerMethodField()
+    row_class = serializers.SerializerMethodField()
+
+    class Meta:
+        model = Ticket
+        # fields = '__all__'
+        fields = ('ticket', 'id', 'priority', 'title', 'queue', 'status', 'created', 'due_date', 'assigned_to', 'row_class')
+
+    def get_ticket(self, obj):
+        return (str(obj.id)+" "+obj.ticket)
+
+    def get_status(self, obj):
+        return (obj.get_status)
+
+    def get_created(self, obj):
+        return (humanize.naturaltime(obj.created))
+
+    def get_due_date(self, obj):
+        return (humanize.naturaltime(obj.due_date))
+
+    def get_assigned_to(self, obj):
+        if obj.assigned_to:
+            if obj.assigned_to.first_name:
+                return (obj.assigned_to.first_name)
+            else:
+                return (obj.assigned_to.email)
+        else:
+            return ("None")
+
+    def get_row_class(self, obj):
+        return (obj.get_priority_css_class)

helpdesk/settings.py

@@ -150,3 +150,7 @@ QUEUE_EMAIL_BOX_UPDATE_ONLY = getattr(settings, 'QUEUE_EMAIL_BOX_UPDATE_ONLY', F
 # only allow users to access queues that they are members of?
 HELPDESK_ENABLE_PER_QUEUE_STAFF_PERMISSION = getattr(
     settings, 'HELPDESK_ENABLE_PER_QUEUE_STAFF_PERMISSION', False)
+
+
+# Asynchronous Datatables - Optional
+USE_SERVERSIDE_PROCESSING = True

helpdesk/templates/helpdesk/ticket_list.html

@@ -6,8 +6,71 @@
 
 <script src='{% static "helpdesk/filter.js" %}'></script>
 <script>
-$(document).ready(function() {
+    {% if server_side %}
+        $(document).ready(function()
+        {
+          let url = ""
+            //DataTables Initialization
+            let tasks_table = $('#ticketTable').DataTable({
+                "language": {
+                    "emptyTable": "{% trans 'No Tickets Match Your Selection' %}"
+                },
+                "processing": true,
+                "serverSide": true,
+                "ajax": {
+                    "url": "/datatables_ticket_list/",
+                    "type": "GET",
+                },
+                createdRow: function( row, data, dataIndex )
+                {
+                    $( row ).addClass(data.row_class);
+                },
 
+                "columns": [
+                  {"data": "ticket",
+                    "render": function (data, type, row, meta)
+                    {
+                        var id = data.split(" ")[0];
+                        var name = data.split(" ")[1];
+                        let url = "{% url 'helpdesk:view' 1234 %}".replace(/1234/, id.toString());
+                        if (type === 'display')
+                        {
+                          data = '<b><a href="' + url + '" >' + name + '</a></b>';
+                        }
+                        return data
+                    }
+                  },
+                  {"data": "id",
+                    "orderable": false,
+                    "render": function(data, type, row, meta)
+                    {
+                      var pk = data;
+                      if(type === 'display'){
+                        data = "<input type='checkbox' name='ticket_id' value='"+pk+"'"+ "class='ticket_multi_select' />"
+                      }
+                        return data
+                      }
+                  },
+                  {"data": "priority"},
+                  {"data": "title",
+                    "render": function (data, type, row, meta)
+                    {
+                      if (type === 'display')
+                      {
+                        data = '<b><a href="' + url + '" >' + data + '</a></b>';
+                      }
+                      return data
+                    }
+                  },
+                  {"data": "queue"},
+                  {"data": "status"},
+                  {"data": "created"},
+                  {"data": "due_date"},
+                  {"data": "assigned_to"},
+                ]
+            });
+          })
+    {% else %}
         $('#ticketTable').DataTable({
           "oLanguage": {
               "sEmptyTable": "{% trans 'No Tickets Match Your Selection' %}"
@@ -15,7 +78,9 @@ $(document).ready(function() {
           "order": [],
           responsive: true
         });
-
+    {% endif %}
+    $(document).ready(function()
+    {
         $("#select_all").click(function() {
         $(".ticket_multi_select").attr('checked', true);
             return false;
@@ -30,8 +95,11 @@ $(document).ready(function() {
             });
             return false;
         });
-});
+      })
 </script>
+
+
+
 {% endblock %}
 {% block h1_title %}Tickets
     {% if from_saved_query %} [{{ saved_query.title }}]{% endif %}{% endblock %}
@@ -227,21 +295,9 @@ $(document).ready(function() {
                                             <th>{% trans "Owner" %}</th>
                                         </tr>
                                     </thead>
-                                    <tbody>
-                                        {% for ticket in tickets %}
-                                        <tr class="{{ ticket.get_priority_css_class }}">
-                                            <th><a href='{{ ticket.get_absolute_url }}'>{{ ticket.ticket }}</a></th>
-                                            <td><input type='checkbox' name='ticket_id' value='{{ ticket.id }}' class='ticket_multi_select' /></td>
-                                            <td>{{ ticket.priority }}</td>
-                                            <th><a href='{{ ticket.get_absolute_url }}'>{{ ticket.title }}</a></th>
-                                            <td>{{ ticket.queue }}</td>
-                                            <td>{{ ticket.get_status }}</td>
-                                            <td data-order='{{ ticket.created|date:"U" }}'><span title='{{ ticket.created|date:"r" }}'>{{ ticket.created|naturaltime }}</span></td>
-                                            <td data-order='{{ ticket.due_date|date:"U" }}'><span title='{{ ticket.due_date|date:"r" }}'>{{ ticket.due_date|naturaltime }}</span></td>
-                                            <td>{{ ticket.get_assigned_to }}</td>
-                                        </tr>
-                                        {% endfor %}
-                                    </tbody>
+                                    {% if not server_side %}
+                                    {% include 'helpdesk/ticket_list_table.html' %}
+                                    {% endif %}
                                 </table>
                             {% csrf_token %}
 

helpdesk/templates/helpdesk/ticket_list_table.html

@@ -0,0 +1,17 @@
+{% load i18n humanize %}
+
+<tbody>
+    {% for ticket in tickets %}
+    <tr class="{{ ticket.get_priority_css_class }}">
+        <th><a href='{{ ticket.get_absolute_url }}'>{{ ticket.ticket }}</a></th>
+        <td><input type='checkbox' name='ticket_id' value='{{ ticket.id }}' class='ticket_multi_select' /></td>
+        <td>{{ ticket.priority }}</td>
+        <th><a href='{{ ticket.get_absolute_url }}'>{{ ticket.title }}</a></th>
+        <td>{{ ticket.queue }}</td>
+        <td>{{ ticket.get_status }}</td>
+        <td data-order='{{ ticket.created|date:"U" }}'><span title='{{ ticket.created|date:"r" }}'>{{ ticket.created|naturaltime }}</span></td>
+        <td data-order='{{ ticket.due_date|date:"U" }}'><span title='{{ ticket.due_date|date:"r" }}'>{{ ticket.due_date|naturaltime }}</span></td>
+        <td>{{ ticket.get_assigned_to }}</td>
+    </tr>
+    {% endfor %}
+</tbody>

helpdesk/urls.py

@@ -141,6 +141,10 @@ urlpatterns = [
     url(r'^ignore/delete/(?P<id>[0-9]+)/$',
         staff.email_ignore_del,
         name='email_ignore_del'),
+
+    url(r'^datatables_ticket_list/$',
+        staff.datatables_ticket_list,
+        name="datatables_ticket_list"),
 ]
 
 urlpatterns += [

helpdesk/views/staff.py

@@ -30,6 +30,14 @@ from django.views.generic.edit import FormView
 
 from django.utils import six
 
+# For datatables serverside
+from django.core.cache import cache
+from rest_framework import viewsets, status
+from rest_framework.response import Response
+from rest_framework.decorators import api_view
+from helpdesk.lib import query_tickets_by_args
+from helpdesk.serializers import TicketSerializer
+
 from helpdesk.decorators import (
     helpdesk_staff_member_required, helpdesk_superuser_required,
     is_helpdesk_staff
@@ -980,6 +988,14 @@ def ticket_list(request):
 
     user_saved_queries = SavedSearch.objects.filter(Q(user=request.user) | Q(shared__exact=True))
 
+    # Serverside processing on datatables is optional. Set
+    # USE_SERVERSIDE_PROCESSING to False in settings.py to disable
+    if helpdesk_settings.USE_SERVERSIDE_PROCESSING:
+        cache.set('ticket_qs', ticket_qs)
+        context['server_side'] = True
+    else:
+        context['server_side'] = False
+
     return render(request, 'helpdesk/ticket_list.html', dict(
         context,
         tickets=ticket_qs,
@@ -999,6 +1015,28 @@ def ticket_list(request):
 ticket_list = staff_member_required(ticket_list)
 
 
+@helpdesk_staff_member_required
+@api_view(['GET', 'POST'])
+def datatables_ticket_list(request):
+    """
+    Datatable on ticket_list.html uses this view from to get objects to display
+    on the table. query_tickets_by_args is at lib.py, TicketSerializer is in
+    serializers.py. The serializers and this view use django-rest_framework methods
+    """
+    try:
+        model_object = query_tickets_by_args(cache.get('ticket_qs'), '-date_created', **request.query_params)
+        serializer = TicketSerializer(model_object['items'], many=True)
+        result = dict()
+        result['data'] = serializer.data
+        result['draw'] = model_object['draw']
+        result['recordsTotal'] = model_object['total']
+        result['recordsFiltered'] = model_object['count']
+        return (Response(result, status=status.HTTP_200_OK, template_name=None, content_type=None))
+
+    except TypeError as e:
+        return (Response(e, status=status.HTTP_404_NOT_FOUND, template_name=None, content_type=None))
+
+
 @helpdesk_staff_member_required
 def edit_ticket(request, ticket_id):
     ticket = get_object_or_404(Ticket, id=ticket_id)

requirements.txt

@@ -7,3 +7,5 @@ lxml
 simplejson
 pytz
 six
+djangorestframework
+django-model-utils