Upload Image to Blob using GAE + Django - django

Question

I'm writing an application using GAE and Django in which I want to give to user the ability to upload his image. Also, I want this image be stored as blob on GAE's datastore. I have seen many examples but nothing specific to this scenario. Although, I feel that is a common issue.
All I want, is to create a new product and this new product must have an image.
1st Attempt: I have tried to add an image attribute (db.BlobProperty()) in product's model, and obviously django does not include it on the presented form.
2nd Attempt: I have created a new entity with two attributes (product as db.ReferenceProperty() and image as db.BlobProperty()). With this I tried to work parallel with django form modifying the django HTML form (including an |input type='file' name='img' /|) expecting that I could take the image from the request object but I failed once more.
This is the Product Class:
class Product(db.Model):
id = db.IntegerProperty()
desc = db.StringProperty()
prodCateg = db.ReferenceProperty(ProductCategory)
price = db.FloatProperty()
details = db.StringProperty()
image = db.BlobProperty()
This is the Django Form (HTML):
<form action="{%url admin.editProduct product.key.id%}" enctype="multipart/form-data" method="post">
<table>
{{form}}
<tr><td><input type="file" name="img" /></td></tr>
<tr><td><input type="submit" value="Create or Edit Product"></td></tr>
</table>
</form>
This is the Django Form (python):
class ProductForm(djangoforms.ModelForm):
class Meta:
model = Product
exclude = ['id']
This is the request handler:
def editProduct(request, product_id):
user = users.GetCurrentUser()
#if user is None:
# return http.HttpResponseForbidden('You must be signed in to add or edit a gift')
product = None
if product_id:
product = Product.get(db.Key.from_path(Product.kind(), int(product_id)))
if product is None:
return http.HttpResponseNotFound('No product exists with that key (%r)' %
product)
form = ProductForm(data=request.POST or None, instance=product)
##########################
# Ambitious undertaking! #
##########################
#if not product_id:
# uploadedImage = get("img")
# photo = Image()
# photo.product = product
# uploadedPhoto = request.FILES['img'].read()
# photo.image = db.Blob(uploadedPhoto)
# image.put()
if not request.POST:
return respond(request, user, 'addprod', {'form': form, 'product': product})
errors = form.errors
if not errors:
try:
product = form.save(commit=False)
except ValueError, err:
errors['__all__'] = unicode(err)
if errors:
return respond(request, user, 'addprod', {'form': form, 'product': product})
product.put()
return http.HttpResponseRedirect('/product')
As you can see the request handler is based on the Google's Gift-Tutorial
So, If anyone could put his opinion I would be very thankful!
Thank you in advance!

Answer 1

You may want to look at an example that uses the blobstore API with blobstoreuploadhandler and/or edit your request handler to store the uploaded file as a blobproperty or a blobreferenceproperty depending on if you use the blobstore API or just a blobproperty variable. You can be specific about http post data i.e. `
self.request.post('img').file.read()
I do recommend that you choose the blobstore API and blobstoreuploadhandler since that will do some very good things for you automatically: 1. storing MIM type and 2. storing filename 3. enabling serving via get_serving_url that has several advantages.