How this Line of code works

[Mayur Bagul]

In below code i didnt understand how colored line of code is working with template code ?

why we are passing Question and primary key? instead of dictionary to context variable.

plz help me to get out of this confusion.

thanking you.

 view.py

from django.shortcuts import get_object_or_404, render

from .models import Question

# ...

def detail(request, question_id):

    question = get_object_or_404(Question, pk=question_id)

    return render(request, 'polls/detail.html', {'question': question})

 detail.html

<h1>{{ question.question_text }}</h1>

<ul>

{% for choice in question.choice_set.all %}

    <li>{{ choice.choice_text }}</li>

{% endfor %}

</ul>

[vineeth sagar]

Hi Mayur,

get_object_or_404, returns an object if it exists in the database or it will raise a 404 exception. So if the object is in the DB, django render template is done, in your case detail.html is rendered with the context dictionary.If there's no row peertaining to the query, then Http404  is raised. So django exception handling kicks in and based on the error code and your debug parameter a particular template is selected.

regards

Vineeth

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[gulam rabbani]

It will give you to fetch the id ! Until end of the id 

[Mayur Bagul]

Hello vineeth,

thanks for information. u missed to mention about why we passing Question class and primary key in get_object_or_404() ? 

How passing such arguments gonna work? 

On Sunday, April 14, 2019 at 1:25:13 PM UTC+5:30, vineeth sagar wrote:

Hi Mayur,

get_object_or_404, returns an object if it exists in the database or it will raise a 404 exception. So if the object is in the DB, django render template is done, in your case detail.html is rendered with the context dictionary.If there's no row peertaining to the query, then Http404  is raised. So django exception handling kicks in and based on the error code and your debug parameter a particular template is selected.

regards

Vineeth

On Sun, 14 Apr 2019, 13:16 Mayur Bagul, <mayur...@gmail.com> wrote:

In below code i didnt understand how colored line of code is working with template code ?

why we are passing Question and primary key? instead of dictionary to context variable.

plz help me to get out of this confusion.

thanking you.

 view.py

from django.shortcuts import get_object_or_404, render

from .models import Question

# ...

def detail(request, question_id):

    question = get_object_or_404(Question, pk=question_id)

    return render(request, 'polls/detail.html', {'question': question})

 detail.html

<h1>{{ question.question_text }}</h1>

<ul>

{% for choice in question.choice_set.all %}

    <li>{{ choice.choice_text }}</li>

{% endfor %}

</ul>

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[Mayur Bagul]

how passing Question and pk=question_id gonna help?

On Sunday, April 14, 2019 at 5:41:06 PM UTC+5:30, gulam rabbani wrote:

It will give you to fetch the id ! Until end of the id 

On Sun, 14 Apr, 2019 at 1:47 PM, Mayur Bagul <mayur...@gmail.com> wrote:

In below code i didnt understand how colored line of code is working with template code ?

why we are passing Question and primary key? instead of dictionary to context variable.

plz help me to get out of this confusion.

thanking you.

 view.py

from django.shortcuts import get_object_or_404, render

from .models import Question

# ...

def detail(request, question_id):

    question = get_object_or_404(Question, pk=question_id)

    return render(request, 'polls/detail.html', {'question': question})

 detail.html

<h1>{{ question.question_text }}</h1>

<ul>

{% for choice in question.choice_set.all %}

    <li>{{ choice.choice_text }}</li>

{% endfor %}

</ul>

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[Jani Tiainen]

Hi.

get_object_or_404 works so that first argument is the model class you want to query. Rest of the parameters are filters that mus return a single object.

You can find this information from the Django docs as well.

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[Mayur Bagul]

hello jani,

thanks for hep. i read django doc and this is the example from it but there is no information provided for why these parameters are used. 

but thanks for your information it is useful like others gave me.

thanking you.

On Monday, April 15, 2019 at 11:59:51 AM UTC+5:30, Jani Tiainen wrote:

Hi.

get_object_or_404 works so that first argument is the model class you want to query. Rest of the parameters are filters that mus return a single object.

You can find this information from the Django docs as well.

[Milind Thombre]

hi Mayur,

What does this application do?

Milind

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