how to upload multiple images to a blog post in django

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>