How to store an image as a Bytes field in cassandra database using cql engine?

Question

I want to store my website images in cassandra database! I must read and store bytes of image. Do you have a nice code for me? I'm using python2.7, django framework and cql-engine!

This is my code:

1- My Model:

from cqlengine import columns
from cqlengine.models import Model

class UserImage(Model):
    Email = columns.Text(primary_key=True)
    image=columns.Bytes(required=False)

2- My Form:

class UserImage(forms.Form):
    image=forms.ImageField()

3- My View:

from MainAPP.models import UserImage as UserImageModel
from MainAPP.forms import UsersForms

from django.http import HttpResponse
from cqlengine import connection
from PIL import Image

def UploadImage(request):
    if request.method == 'POST':
        form = UsersForms.UserImage(request.POST, request.FILES)
        if form.is_valid():
            try:
                image_data=Image.open(request.FILES['image'])
            except IOError:
                return HttpResponse("cannot upload %s"% request.FILES['image'].name)
            connection.setup(['127.0.0.1:9160'])
            UserImageModel.create(Email='[email protected]', image=image_data)
            return HttpResponse('Stored Successfully!')
    else:
        form= UsersForms.UserImage()
        return render_to_response('Users/uploadImage.html', {'form': form}, context_instance=RequestContext(request))

My Template:

{% block content %}
    <form enctype="multipart/form-data" method="post" action="">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit">Upload</button>
    </form>
{% endblock %}

My ERROR In Rendered Template:

AttributeError at /uploadImage
encode
Request Method: POST
Request URL:    http://127.0.0.1:8000/uploadImage
Django Version: 1.5.1
Exception Type: AttributeError
Exception Value:    encode

What is your idea? Please guide me...

Answer 1

If you look at the exception message you are getting, it says AttributeError: encode. This is telling you that somewhere in that code path, something is looking for an attribute (or most likely a method) called "encode" on some object and not finding it.

I suspect that you are not passing the right duck-typed object to cqlengine for UserImage.image. Does it know how to speak PIL Image objects? I doubt it. I bet cqlengine is looking for the typical python string method .encode (http://docs.python.org/2/library/stdtypes.html#str.encode). Instead of passing the PIL image, try passing just the raw bytes you receive from the form posting.