{"id":5875,"date":"2022-11-28T04:39:02","date_gmt":"2022-11-28T04:39:02","guid":{"rendered":"https:\/\/www.pythontutorial.net\/?page_id=5875"},"modified":"2023-08-17T09:25:20","modified_gmt":"2023-08-17T09:25:20","slug":"django-edit-form","status":"publish","type":"page","link":"https:\/\/www.pythontutorial.net\/django-tutorial\/django-edit-form\/","title":{"rendered":"Django Edit Form"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you’ll learn how to create a Django edit form to update a post and save the changes into the database.<\/p>\n\n\n\n

This tutorial begins where creating Django flash messages<\/a> tutorial left off.<\/p>\n\n\n\n

We’ll create a Django Edit Form that updates a blog post and saves the changes into the database.<\/p>\n\n\n\n

Create an URL pattern #<\/a><\/h2>\n\n\n\n

First, create a URL pattern for editing a post:<\/p>\n\n\n

from<\/span> django.urls import<\/span> path\n<\/span><\/span>from<\/span> . import<\/span> views\n<\/span><\/span>\n<\/span><\/span>urlpatterns = [\n<\/span><\/span>    path(''<\/span>, views.home, name='posts'<\/span>),\n<\/span><\/span>    path('post\/create'<\/span>, views.create_post, name='post-create'<\/span>),\n<\/span><\/span>    path('post\/edit\/<int:id>\/'<\/span>, views.edit_post, name='post-edit'<\/span>),\n<\/span><\/mark>    path('about\/'<\/span>, views.about, name='about'<\/span>),\n<\/span><\/span>]\n<\/span><\/span><\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
The editing post URL accepts an id as an integer specified by the <int:id><\/code> pattern. For example, if you edit the post with id 1, the URL will be:<\/p>\n\n\n
http:\/\/127.0<\/span>.0<\/span>.1<\/span>\/post\/update\/1<\/span>\/<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Django will pass the id (1) to the second argument to the edit_post()<\/code> function.<\/p>\n\n\n\n
If you pass a value that is not an integer to the URL like this: <\/p>\n\n\n
http:\/\/127.0<\/span>.0<\/span>.1<\/span>\/post\/update\/abcd\/<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Django will redirect to 404 because it doesn’t match any URL in the URL patterns.<\/p>\n\n\n\n
Define a view function #<\/a><\/h2>\n\n\n\n
Define the edit_post()<\/code> function in the views.py<\/code> file:<\/p>\n\n\n
from<\/span> django.shortcuts import<\/span> render,redirect, get_object_or_404\n<\/span><\/mark>from<\/span> django.contrib import<\/span> messages\n<\/span><\/span>from<\/span> .models import<\/span> Post\n<\/span><\/span>from<\/span> .forms import<\/span> PostForm\n<\/span><\/span>\n<\/span><\/span>    \n<\/span><\/span>def<\/span> edit_post<\/span>(request, id)<\/span>:<\/span>\n<\/span><\/mark>    post = get_object_or_404(Post, id=id)\n<\/span><\/mark>\n<\/span><\/mark>    if<\/span> request.method == 'GET'<\/span>:\n<\/span><\/mark>        context = {'form'<\/span>: PostForm(instance=post), 'id'<\/span>: id}\n<\/span><\/mark>        return<\/span> render(request,'blog\/post_form.html'<\/span>,context)\n<\/span><\/mark>\n<\/span><\/span># other functions<\/span>\n<\/span><\/span><\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
How it works:<\/p>\n\n\n\n
First, import get_object_or_404<\/code> function from the django.shortcuts<\/code> module:<\/p>\n\n\n
from<\/span> django.shortcuts import<\/span> render,redirect, get_object_or_404<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
The get_object_or_404()<\/code> function gets an object by id or redirects to the 404 page if the id doesn’t exist.<\/p>\n\n\n\n
Second, define the edit_post()<\/code><\/code> function that accepts an HttpRequest<\/code> object (request<\/code>) and an id<\/code> as an integer. <\/p>\n\n\n\n
The edit_post()<\/code><\/code> function does the following steps: <\/p>\n\n\n\n