Integrity Error, UNIQUE constraint failed - django

Question

I am trying to allow users to upload photos and to be able to change them. Whenever the user comes back and changes the photos I get an Integrity error, "UNIQUE constraint failed: portal_content.user_id". I assume it's that I am trying to save the user when there already is one. The problem with this though is that I do not know how work around around it and fix it. I've seen similar problems, but do to my skill level I am not really sure on how to fix it. Here is my code:
Model:
def content_file_name(instance, filename):
return '/'.join(['content', instance.user.username, filename])
class Content(models.Model):
user = models.OneToOneField(User, unique=True)
image1 = models.ImageField(upload_to=content_file_name, null=True, blank=True)
image2 = models.ImageField(upload_to=content_file_name, null=True, blank=True)
image3 = models.ImageField(upload_to=content_file_name, null=True, blank=True)
image4 = models.ImageField(upload_to=content_file_name, null=True, blank=True)
image5 = models.ImageField(upload_to=content_file_name, null=True, blank=True)
image6 = models.ImageField(upload_to=content_file_name, null=True, blank=True)
image7 = models.ImageField(upload_to=content_file_name, null=True, blank=True)
image8 = models.ImageField(upload_to=content_file_name, null=True, blank=True)
terms = models.ImageField(upload_to=content_file_name, null=True, blank=True)
View:
#login_required
def register(request):
if request.POST:
content = Content()
content.user = request.user
content.image1 = request.FILES.get('image1_upload', None)
content.image2 = request.FILES.get('image2_upload', None)
content.image3 = request.FILES.get('image3_upload', None)
content.image4 = request.FILES.get('image4_upload', None)
content.image5 = request.FILES.get('image5_upload', None)
content.image6 = request.FILES.get('image6_upload', None)
content.image7 = request.FILES.get('image7_upload', None)
content.image8 = request.FILES.get('image8_upload', None)
content.terms = request.POST.get('terms')
content.save()
return redirect('/portal/register')
try:
gallery = Content.objects.get(user=request.user)
return render(request, 'portal/register.html', {'gallery': gallery})
except ObjectDoesNotExist:
print 'Does Not Exist!'
return render(request, 'portal/register.html')
Template:
{% extends 'portal/base.html' %}
{% load staticfiles %}
{% block head_block %}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css" rel="stylesheet">
<script language="javascript" type="text/javascript" src="{% static 'js/input.js' %}"></script>
<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js" type="text/javascript"></script>
{% endblock %}
{% block body_block %}
<div class="container">
<form role="form" method="post" action="." id="js-upload-form" enctype="multipart/form-data">
{% csrf_token %}
<div class="row">
<div class="col-lg-12">
<h1 class="page-header">{{ user.username }}</h1>
</div>
<div class="col-lg-3 col-md-4 col-xs-6 thumb">
<a class="thumbnail" href="#">
<img class="img-responsive" id="image1" src="/media/{{ gallery.image1 }}" alt="">
</a>
<input type="file" name="image1_upload" id="image1_upload" multiple>
</div>
<div class="col-lg-3 col-md-4 col-xs-6 thumb">
<a class="thumbnail" href="#">
<img class="img-responsive" id="image2" src="/media/{{ gallery.image2 }}" alt="">
</a>
<input type="file" name="image2_upload" id="image2_upload" multiple>
</div>
<div class="col-lg-3 col-md-4 col-xs-6 thumb">
<a class="thumbnail" href="#">
<img class="img-responsive" id="image3" src="/media/{{ gallery.image3 }}" alt="">
</a>
<input type="file" name="image3_upload" id="image3_upload" multiple>
</div>
<div class="col-lg-3 col-md-4 col-xs-6 thumb">
<a class="thumbnail" href="#">
<img class="img-responsive" id="image4" src="/media/{{ gallery.image4 }}" alt="">
</a>
<input type="file" name="image4_upload" id="image4_upload" multiple>
</div>
<div class="col-lg-3 col-md-4 col-xs-6 thumb">
<a class="thumbnail" href="#">
<img class="img-responsive" id="image5" src="/media/{{ gallery.image5 }}" alt="">
</a>
<input type="file" name="image5_upload" id="image5_upload" multiple>
</div>
<div class="col-lg-3 col-md-4 col-xs-6 thumb">
<a class="thumbnail" href="#">
<img class="img-responsive" id="image6" src="/media/{{ gallery.image6 }}" alt="">
</a>
<input type="file" name="image6_upload" id="image6_upload" multiple>
</div>
<div class="col-lg-3 col-md-4 col-xs-6 thumb">
<a class="thumbnail" href="#">
<img class="img-responsive" id="image7" src="/media/{{ gallery.image7 }}" alt="">
</a>
<input type="file" name="image7_upload" id="image7_upload" multiple>
</div>
<div class="col-lg-3 col-md-4 col-xs-6 thumb">
<a class="thumbnail" href="#">
<img class="img-responsive" id="image8" src="/media/{{ gallery.image8 }}" alt="">
</a>
<input type="file" name="image8_upload" id="image8_upload" multiple>
</div>
</div>
<br>
<!--<div class="form-group">-->
<!--<textarea name="terms" id="terms" class="form-control input-sm" placeholder="Terms" value="{{ content.terms }}"></textarea>-->
<!--</div>-->
<div class="form-group">
<input type="text" name="terms" id="terms" class="form-control input-sm" placeholder="terms" value="{{ gallery.terms }}">
</div>
<br>
<input type="submit" value="Register" id="js-upload-submit" class="btn btn-info btn-block">
</form>
<br>
<!-- Button trigger modal -->
<button type="button" class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal">
iPad View
</button>
<!-- Modal -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span></button>
<h4 class="modal-title" id="myModalLabel">Modal title</h4>
</div>
<div class="modal-body">
<div class="row">
<div class="col-lg-12">
<h1 class="page-header">{{ user.Username }}</h1>
</div>
<div class="col-lg-3 col-md-4 col-xs-6 thumb">
<a class="thumbnail" href="#">
<img class="img-responsive" src="/media/{{ gallery.image1 }}" alt="">
</a>
</div>
<div class="col-lg-3 col-md-4 col-xs-6 thumb">
<a class="thumbnail" href="#">
<img class="img-responsive" src="/media/{{ gallery.image2 }}" alt="">
</a>
</div>
<div class="col-lg-3 col-md-4 col-xs-6 thumb">
<a class="thumbnail" href="#">
<img class="img-responsive" src="/media/{{ gallery.image3 }}" alt="">
</a>
</div>
<div class="col-lg-3 col-md-4 col-xs-6 thumb">
<a class="thumbnail" href="#">
<img class="img-responsive" src="/media/{{ gallery.image4 }}" alt="">
</a>
</div>
<div class="col-lg-3 col-md-4 col-xs-6 thumb">
<a class="thumbnail" href="#">
<img class="img-responsive" src="/media/{{ gallery.image5 }}" alt="">
</a>
</div>
<div class="col-lg-3 col-md-4 col-xs-6 thumb">
<a class="thumbnail" href="#">
<img class="img-responsive" src="/media/{{ gallery.image6 }}" alt="">
</a>
</div>
<div class="col-lg-3 col-md-4 col-xs-6 thumb">
<a class="thumbnail" href="#">
<img class="img-responsive" src="/media/{{ gallery.image7 }}" alt="">
</a>
</div>
<div class="col-lg-3 col-md-4 col-xs-6 thumb">
<a class="thumbnail" href="#">
<img class="img-responsive" src="/media/{{ gallery.image8 }}" alt="">
</a>
</div>
</div>
<p>
{{ gallery.terms }}
</p>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
<button type="button" class="btn btn-primary">Save changes</button>
</div>
</div>
</div>
</div>
<script language="javascript" type="text/javascript" src="{% static 'js/preview.js' %}"></script>
{% endblock %}
<!--http://jsfiddle.net/Mqvgx/-->

Answer 1

Your register() view attempts to create a new Content object each time. Since every user can only be related to a single Content object, when attempting to create a second one, it will fail.
You could replace content = Content() with a content, created = Content.objects.get_or_create(user=request.user). This would take care of multiple Content objects for a user.
P.S. a much better approach would be to use Django's ModelForms.