ImageField – Django forms

30 Jun, 2022
ImageField in Django Forms is a input field for upload of image files. The default widget for this input is ClearableFileInput. It normalizes to: An UploadedFile object that wraps the file content and file name into a single object. This article revolves about how to upload images with Django forms and how can you save that to the database.Note:  
When Django handles a file upload, the file data ends up placed in request.FILES (for more on the request object see the documentation for request and response objects).
While working with files, make sure the HTML form tag contains enctype=”multipart/form-data” property.
Syntax 
field_name = forms.ImageField(**options)
 
Illustration of ImageField using an Example. Consider a project named geeksforgeeks having an app named geeks.  
Refer to the following articles to check how to create a project and an app in Django.  
How to Create a Basic Project using MVT in Django?
How to Create an App in Django ?
Enter the following code into forms.py file of geeks app.  
Python3
from django import forms class GeeksForm(forms.Form):    name = forms.CharField()    geeks_field = forms.ImageField()
Add the geeks app to INSTALLED_APPS  
Python3
# Application definition INSTALLED_APPS = [    'django.contrib.admin',    'django.contrib.auth',    'django.contrib.contenttypes',    'django.contrib.sessions',    'django.contrib.messages',    'django.contrib.staticfiles',    'geeks',]
Now to render this form into a view we need a view and a URL mapped to that URL. Let’s create a view first in views.py of geeks app,  
Python3
from django.shortcuts import renderfrom .forms import GeeksForm # Create your views here.def home_view(request):    context = {}    context['form'] = GeeksForm()    return render( request, "home.html", context)
Here we are importing that particular form from forms.py and creating an object of it in the view so that it can be rendered in a template. Now, to initiate a Django form you need to create home.html where one would be designing the stuff as they like. Let’s create a form in home.html. 
html
<form method="POST" enctype="multipart/form-data">    {% csrf_token %}    {{ form.as_p }}    <input type="submit" value="Submit"></form>
Finally, a URL to map to this view in urls.py  
Python3
from django.urls import path # importing views from views..pyfrom .views import home_view urlpatterns = [    path('', home_view ),]
Let’s run the server and check what has actually happened, Run  
Python manage.py runserver
 
Thus, an geeks_field ImageField is created by replacing “_” with ” “. It is a field to input image files from the user. 
ImageField is used for input of image files in the database. One can input Email Id, etc. Till now we have discussed how to implement ImageField but how to use it in the view for performing the logical part. To perform some logic we would need to get the value entered into field into a python string instance. ImageField is different from other fields and it needs to be handled properly. As stated above, data fetched from a ImageField would be stored in request.FILES object. Let’s create a ImageField in Django models to demonstrate the saving of images using forms in database. To get working code for upload of files from github click here. In models.py,  
Python3
from django.db import models # Create your models here.class GeeksModel(models.Model):    title = models.CharField(max_length = 200)    img = models.ImageField(upload_to = "images/")     def __str__(self):        return self.title
In views.py, 
Python3
from django.shortcuts import renderfrom .forms import GeeksFormfrom .models import GeeksModel # Create your views here.def home_view(request):    context = {}    if request.method == "POST":        form = GeeksForm(request.POST, request.FILES)        if form.is_valid():            name = form.cleaned_data.get("name")            img = form.cleaned_data.get("geeks_field")            obj = GeeksModel.objects.create(                                 title = name,                                 img = img                                 )            obj.save()            print(obj)    else:        form = GeeksForm()    context['form']= form    return render(request, "home.html", context)
Let’s explain what this code does, this code saves the file uploaded by the user in GeeksModel ImageField Database. Whenever a file is uploaded, it is saved to request.FILES object with key as name of the field. So we have created a model where image uploaded by the user is saved. Let’s try saving a image file to the database now. 
It has loaded successfully and file is saved in GeeksModel of geeks app. Above object is printed and hence instance of obj has been created.  
 
Core Field arguments are the arguments given to each field for applying some constraint or imparting a particular characteristic to a particular Field. For example, adding an argument required = False to ImageField will enable it to be left blank by the user. Each Field class constructor takes at least these arguments. Some Field classes take additional, field-specific arguments, but the following should always be accepted: 
.math-table { border-collapse: collapse; width: 100%; } .math-table td { border: 1px solid #5fb962; text-align: left !important; padding: 8px; } .math-table th { border: 1px solid #5fb962; padding: 8px; } .math-table tr>th{ background-color: #c6ebd9; vertical-align: middle; } .math-table tr:nth-child(odd) { background-color: #ffffff; }
 
 
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