具有查询集的xDjango内部联接表

Question

I'm trying to INNER join 2 tables: Comments and Auth . So I store userid in Comments table and I need to pair it with the Auth .

I did with .raw() , but I don't want to do with the raw() , I have tried also other like get_objects_or_404 but that does not work either because of multiple queries.

Here is my query, works as excepted.

SELECT * FROM index_comment INNER JOIN auth_user WHERE index_comment.userid=auth_user.id

And here is my Comment model:

class Comment(models.Model):
content = models.TextField()
userid = models.IntegerField()
published = models.DateField(default=timezone.now)
postid = models.IntegerField()

Views.py

def readPost(request, postName):
content = get_object_or_404(Post, link=postName)
kategori = get_object_or_404(Category, id=content.category_id)
user = get_object_or_404(User, id=content.username_id)  


if request.method == "POST":
    form = sendComment(request.POST)
    if form.is_valid:
        formContent = strip_tags(request.POST["content"])
        newComment = Comment()
        newComment.content = formContent
        newComment.postid = content.id
        newComment.save()
        return redirect('post',content.link)


else:
    form = sendComment
    args = {
        "content": content,
        "kategori": kategori,
        "user":user,
        "commentForm": form,

    }

# return HttpResponse("cat.id")
    return render(request, "theme/single.html", args)

And here is the forms.py

class sendComment(forms.Form):
content = forms.CharField(widget=forms.TextInput(attrs={"class":"form-control"}))

So I need to pair userid from Comments table to Auth id, and then get the username .

Answer 1

By setting up your models properly with a foreign key relationship ( django docs ) from index_comment.userid to auth_user.id, Django will handle the join for you and make the columns of the joined table(auth_user) available through the primary model (index_comment).

Something like:

from django.db import models
from django.contrib.auth.models import User

class Comment(models.Model):
    content = models.TextField()
    userid = models.ForeignKey(User,on_delete=models.CASCADE)
    published = models.DateField(default=timezone.now)
    postid = models.IntegerField()

will tie the userid in your comment table to the user table of django's built auth functionality. the name fields will be available to Comment like

comment.userid.username