how to upload multiple images to a blog post in django

Question

I am trying to allow each user to upload multiple pictures to a single blog post. I have been trying to work out the best way to do this for a few days now. What is the best practice to do this?

From what I have read, I should make a seperate image model from the blog post model and use a foreign key. Is that right? Then there is the matter of how to allow them to upload multiple pictures at the same time. Am I right in assuming I should use something like drop zone?

Any advice on best practices for storing the photos is also welcome. I have looked at Amazon s3 and cloudinary. I want to create something which is scalable.

Any help would be much appreciated!

Answer 1

You'll just need two models. One for the Post and the other would be for the Images. Your image model would have a foreignkey to the Post model:

from django.db import models from django.contrib.auth.models import User from django.template.defaultfilters import slugify  class Post(models.Model):     user = models.ForeignKey(User)     title = models.CharField(max_length=128)     body = models.CharField(max_length=400)    def get_image_filename(instance, filename):     title = instance.post.title     slug = slugify(title)     return "post_images/%s-%s" % (slug, filename)     class Images(models.Model):     post = models.ForeignKey(Post, default=None)     image = models.ImageField(upload_to=get_image_filename,                               verbose_name='Image') 

You need to create a form for each model, but they will be related to each other, as in when the user is filling out the form post he has to complete the image form too for the post to successfully be posted, and we shall do that in the views, but for now your form can look something like this

from django import forms from .models import Post, Images  class PostForm(forms.ModelForm):     title = forms.CharField(max_length=128)     body = forms.CharField(max_length=245, label="Item Description.")       class Meta:         model = Post         fields = ('title', 'body', )     class ImageForm(forms.ModelForm):     image = forms.ImageField(label='Image')         class Meta:         model = Images         fields = ('image', ) 

Now this is the most important part of everything, the views, because this is where uploading multiple images to a single magic happens. For us to be able to upload multiple images at once, we need multiple image fields right? That's where you fall in love with Django formsets. We will need django formsets to make this happen, you can read about formsets in the Django documentation, which I have linked :) But here is how your view should look like:

*Very important the imports

from django.shortcuts import render from django.forms import modelformset_factory from django.contrib.auth.decorators import login_required from django.contrib import messages from django.http import HttpResponseRedirect from .forms import ImageForm, PostForm from .models import Images  @login_required def post(request):       ImageFormSet = modelformset_factory(Images,                                         form=ImageForm, extra=3)     #'extra' means the number of photos that you can upload   ^     if request.method == 'POST':              postForm = PostForm(request.POST)         formset = ImageFormSet(request.POST, request.FILES,                                queryset=Images.objects.none())                   if postForm.is_valid() and formset.is_valid():             post_form = postForm.save(commit=False)             post_form.user = request.user             post_form.save()                  for form in formset.cleaned_data:                 #this helps to not crash if the user                    #do not upload all the photos                 if form:                     image = form['image']                     photo = Images(post=post_form, image=image)                     photo.save()             # use django messages framework             messages.success(request,                              "Yeeew, check it out on the home page!")             return HttpResponseRedirect("/")         else:             print(postForm.errors, formset.errors)     else:         postForm = PostForm()         formset = ImageFormSet(queryset=Images.objects.none())     return render(request, 'index.html',                   {'postForm': postForm, 'formset': formset}) 

In the view, we are getting both of our forms, and it will check both forms whether they are valid or not. In that way, user has to fill the form AND upload all the images which, in this case, are 3 extra=3. Only then will the post successfully get created.

Your template should look like this then:

<form id="post_form" method="post" action="" enctype="multipart/form-data">       {% csrf_token %}     {% for hidden in postForm.hidden_fields %}         {{ hidden }}     {% endfor %}       {% for field in postForm %}         {{ field }} <br />     {% endfor %}       {{ formset.management_form }}     {% for form in formset %}         {{ form }}     {% endfor %}         <input type="submit" name="submit" value="Submit" /> </form> 

Answer 2

Step by step solution => Even, I was stuck too. So this is how I successfully do.

Finally, implementing below code, I achieved this

• 1 Note model with many Images
• Multiple Uploads(at the same time, with same Choose File button, & all save together as like in Gmail file upload)

Here are my Note and Image Model- (or see full code)

class Note(models.Model):     user = models.ForeignKey(settings.AUTH_USER_MODEL,on_delete=models.CASCADE)     title = models.CharField(max_length=30)     text = models.TextField(null=True,blank=True)     created_date = models.DateTimeField(auto_now_add=True)     last_modified = models.DateTimeField(auto_now=True)  class Images(models.Model):     note = models.ForeignKey(Note,on_delete=models.CASCADE)     image = models.ImageField(upload_to=user_directory_path,null=True,blank=True) 

Here is my form (Link of doc. on multiple upload)- (or see full code)

class NoteForm(forms.ModelForm):     class Meta:         model = Note         fields = ['title','text'] #make sure to mention field here, if nothing is mentioned then all will be required.  class NoteFullForm(NoteForm): #extending form     images = forms.FileField(widget=forms.ClearableFileInput(attrs={'multiple': True}))      class Meta(NoteForm.Meta):         fields = NoteForm.Meta.fields + ['images',] 

Here is my View file- (or see full code)

def addNoteView(request): if request.method == "POST":     #images will be in request.FILES     form = NoteFullForm(request.POST or None, request.FILES or None)     files = request.FILES.getlist('images')     if form.is_valid():         user = request.user         title = form.cleaned_data['title']         text = form.cleaned_data['text']         note_obj = Note.objects.create(user=user,title=title,text=text) #create will create as well as save too in db.         for f in files:             Images.objects.create(note=note_obj,image=f)     else:         print("Form invalid") 

And, finally my Html file (be sure to bind files as said in docs)- (or see full code)

<form action="{% url 'note:add_note' %}" method="post" class="note-form" enctype="multipart/form-data">{% csrf_token %}   <div class="form-group">     <label for="note-title">Title</label>     <input type="text" name="title" class="form-control" id="note-title" placeholder="Enter Title" required>   </div>   <div class="form-group">     <label for="note-description">Description</label>     <textarea type="text" name="text" class="form-control" id="note-description" placeholder="Description here"></textarea>   </div>   <div class="form-group">     <label for="note-image">Images</label>     <input type="file" name="images" class="form-control-file" id="note-image" multiple>   </div>   <button type="submit" class="btn btn-primary">Submit</button> </form>