Trace the changes made to a django model. You can see how to use it in example.py

actions.py

# -*- encoding: utf-8 -*-

# --------------------------
# Ripped from django project
# --------------------------

from django.contrib.contenttypes.models import ContentType
from django.utils.translation import ugettext as _
from django.utils.encoding import force_unicode


def log_addition(object):
    """
    Log that an object has been successfully added.

    The default implementation creates an admin LogEntry object.
    """
    from django.contrib.admin.models import LogEntry, ADDITION
    LogEntry.objects.log_action(
        user_id=object.created_by.id,
        content_type_id=ContentType.objects.get_for_model(object).pk,
        object_id=object.pk,
        object_repr=force_unicode(object),
        action_flag=ADDITION
    )


def log_change(object):
    """
    Log that an object has been successfully changed.

    The default implementation creates an admin LogEntry object.
    """
    from django.contrib.admin.models import LogEntry, CHANGE
    LogEntry.objects.log_action(
        user_id=object.created_by.id,
        content_type_id=ContentType.objects.get_for_model(object).pk,
        object_id=object.pk,
        object_repr=force_unicode(object),
        action_flag=CHANGE,
        change_message=_('Changed')
    )


def log_deletion(object):
    """
    Log that an object will be deleted. Note that this method is called
    before the deletion.

    The default implementation creates an admin LogEntry object.
    """
    from django.contrib.admin.models import LogEntry, DELETION
    LogEntry.objects.log_action(
        user_id=object.created_by.id,
        content_type_id=ContentType.objects.get_for_model(object).pk,
        object_id=object.pk,
        object_repr=force_unicode(object),
        action_flag=DELETION
    )

admin.py

# -*- encoding: utf-8 -*-

# --------------------------------
# Ripped from somewhere on the net
# --------------------------------

from django.contrib import admin
from django.contrib.admin.models import LogEntry, DELETION
from django.utils.html import escape
from django.core.urlresolvers import reverse


class LogEntryAdmin(admin.ModelAdmin):

    date_hierarchy = 'action_time'

    readonly_fields = LogEntry._meta.get_all_field_names()

    list_filter = [
        'user',
        'content_type',
        'action_flag'
    ]

    search_fields = [
        'object_repr',
        'change_message'
    ]

    list_display = [
        'action_time',
        'user',
        'content_type',
        'object_link',
        'action_flag',
        'change_message',
    ]

    def has_add_permission(self, request):
        return False

    def has_change_permission(self, request, obj=None):
        return request.user.is_superuser and request.method != 'POST'

    def has_delete_permission(self, request, obj=None):
        return False

    def object_link(self, obj):
        if obj.action_flag == DELETION:
            link = escape(obj.object_repr)
        else:
            ct = obj.content_type
            link = u'<a href="%s">%s</a>' % (
                reverse('admin:%s_%s_change'
                    % (ct.app_label, ct.model), args=[obj.object_id]),
                escape(obj.object_repr),
            )
        return link
    object_link.allow_tags = True
    object_link.admin_order_field = 'object_repr'
    object_link.short_description = u'object'


admin.site.register(LogEntry, LogEntryAdmin)

example.py

---------
models.py
---------
.
.
.
class MyModel(TraceableModel):
    title = models.CharField(max_length=256)
    duration = models.IntegerField()
.
.
.

--------
views.py
--------
def my_method(request):
.
.
.
request_params = dict([k, v] for k, v in request.POST.items())
request_params.update({'created_by': request.user.id})
.
.
.

This way you can access to django admin an see Admin > Log Entries

models.py

# -*- encoding: utf-8 -*-

from django.db.models.signals import post_delete, post_save
from django.contrib.auth.models import User
from django.dispatch import receiver
from django.db import models

from log.actions import log_addition
from log.actions import log_deletion
from log.actions import log_change


class TraceableModel(models.Model):
    created_by = models.ForeignKey(User)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        abstract = True


@receiver(post_save)
def post_save_handler(sender, instance, created, using, **kwargs):
    if isinstance(instance, TraceableModel):
        if created:
            log_addition(instance)
        else:
            log_change(instance)


@receiver(post_delete)
def post_delete_handler(sender, instance, using, **kwargs):
    if isinstance(instance, TraceableModel):
        log_deletion(instance)