(Django python) Using multiple 'for loop' for render [duplicate]

Question

Hey guys I'm making English test system for education by using Django python.
the system display one article and several(not fixed) questions about the article.
and every question has selectable items which numbers are not fixed.

for example
{ ---------- article -------------- }
{ ---------- question --------------}
{ ---------- item ------------------}
{ ---------- item ------------------}
{ ---------- item ------------------}
{ ---------- question --------------}
{ ---------- item ------------------}
{ ---------- item ------------------}
{ ---------- item ------------------}

so I defined model like this :

# Question DB
class Article(models.Model):
    a_name = models.TextField(unique=True)
    a_con = models.TextField() #Article Contents

class Question(models.Model):
    q_name = models.TextField(unique=True)
    q_a = models.ForeignKey(Article,on_delete=models.CASCADE)
    q_con = models.TextField() #Question Contents
    q_ans = models.TextField() #Question Correct Answer
    
class Item(models.Model):
    i_q = models.ForeignKey(Question,on_delete=models.CASCADE)
    i_seq = models.PositiveIntegerField() #Item Sequence
    i_con = models.TextField() #Item Contents

# Image DB
class ArticleImage(models.Model):
    ai_name = models.TextField(unique=True)
    ai_a = models.ForeignKey(Article,on_delete=models.CASCADE)
    ai_src = models.TextField()

class QuestionImage(models.Model):
    qi_name = models.TextField(unique=True)
    qi_q = models.ForeignKey(Question,on_delete=models.CASCADE)
    qi_src = models.TextField()

class ItemImage(models.Model):
    ii_name = models.TextField(unique=True)
    ii_i = models.ForeignKey(Item,on_delete=models.CASCADE)
    ii_src = models.TextField()

and I wrote view.py like this:

def findQuestionbyArticle(article_name):
    _ARTICLE_ = Article.objects.filter(a_name = article_name)
    for a in _ARTICLE_:
        _ARTICLE_IMAGE_ = ArticleImage.objects.filter(ai_a = a)
        _QUESTION_ = Question.objects.filter(q_a = a)
        _ITEM_ = {}
        _ITEM_IMAGE_ = {}
        for q in _QUESTION_:
            _QUESTION_IMAGE_ = QuestionImage.objects.filter(qi_q = q)
            _ITEM_[q] = Item.objects.filter(i_q = q)
            for i in _ITEM_[q]:
                _ITEM_IMAGE_[i] = ItemImage.objects.filter(ii_i = i)
    return {
        'article' : _ARTICLE_, 
        'article_image' : _ARTICLE_IMAGE_ , 
        'question' : _QUESTION_,
        'question_image' : _QUESTION_IMAGE_,
        'item' : _ITEM_,
        'item_image' : _ITEM_IMAGE_
    }

and I wrote index.html for template like this:

<div class = "content-a">
        <div class = "article">
            {%for article in articles%}
                <span>{{article.a_con}}</span>
                {%for article_image in article_images%}
                    <img src = {{article_image.src}}>
                {%endfor%}
            {%endfor%}
        </div>
        {%for question in questions %}
            <div class = "question">
                <span>{{question.q_con}}</span>
                {%for question_image in question_images %}
                    <img src = {{question_image.src}}>
                {%endfor%}
                {%for item in items[question] %}
                <div class = "item">
                    <span>{{item.i_con}}</span>
                    {%for item_image in item_images%}
                        <img src = {{item_image[item].src}}>
                    {%endfor%}
                </div>
                {%endfor%}
            </div>
        {%endfor%}
    </div>

Of course, It doesn't work ... In this case, how can I make it work ?
If you have any idea please help me ... this problem is bothering me during a week ...

EDIT:

the result shows this error page.

if You need to change rest of selectors content based on firs article selection then you need to use Ajax in template to return rendered context from DB. — Zaraki Kenpachi
– Zaraki Kenpachi, Commented Sep 8, 2020 at 13:12
@ZarakiKenpachi thanks for reply, Do you mean if I use Ajax I can display multiple 'for loop' in my page? — Lukas
– Lukas, Commented Sep 8, 2020 at 13:21
you can change context displayed in question section based on selected article. — Zaraki Kenpachi
– Zaraki Kenpachi, Commented Sep 8, 2020 at 13:24
@ZarakiKenpachi Ah understood, thank you If I need I should consider using that — Lukas
– Lukas, Commented Sep 8, 2020 at 13:48
@bdemirka I solved this problem refer this topic thank you! stackoverflow.com/questions/8000022/… — Lukas
– Lukas, Commented Sep 9, 2020 at 12:17

Ole Pannier · Accepted Answer · 2021-07-27 21:24:19Z

-1

To begin with, you may have a look at your syntax. You're making a repeated mistake at the functions calls such as:

{%for article in article%} instead of {% for article in article %}
{%for question_image in question_images %} instead of  {% for  
{%endfor%} instead of {% endfor %}

Correct them and try again. It might work. For such a case, you may have a look at the correct tag format in the official django documentation.

edited Jul 27, 2021 at 21:24

Ole Pannier

3,7719 gold badges26 silver badges35 bronze badges

answered Sep 8, 2020 at 13:31

Erick

3144 silver badges17 bronze badges

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4 Comments

Lukas Over a year ago

I already leave my seat ... I'll check tomorrow and I'm gonna tell you about the result! thank you!

bdemirka Over a year ago

it is not a syntax error, you can use it both way

Erick Over a year ago

@bedemirka. If what you say is correct is new for me. I just check the official django documentation docs.djangoproject.com/en/3.1/topics/templates/…. You will see that what I'm proposing is the correct syntax, and in my experience I messed up whenever I format the tags as you 're proposing.

Lukas Over a year ago

thank you, but It shows same error after fix it.

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