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How to use detail view function-based views in Django

Njoku Ifeanyi Gerald

In this shot, we are going to learn how to get the details of a particular instance. Detail view refers to a view that displays a particular instance of a table from the database with all the necessary details. Detail view is used to display multiple types of data on a single page or view, e.g., the details of a user.

Installation

Run the following commands.

pip is a package manager for Python packages.

pip install pipenv
pipenv shell
pipenv install django

Then:

django-admin startproject crud ./

python manage.py startapp codebase
python manage.py migrate

python manage.py runserver

Go to settings.py and add the following.

settings.py

settings.py helps register your app and packages that are being installed, and even writes rules.

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',

    'codebase'
]
settings.py

In the codebase app folder, go to models.py.

models.py

This file is responsible for creating the model for the database.

from django.db import models
from django.urls import reverse

class CRUD(models.Model):
  name = models.CharField(max_length=30)
  age = models.IntegerField()
  level = models.CharField(max_length=30)
  date = models.DateTimeField(auto_now_add=True)

  #display the data with name
  def __str__(self):
    return self.name

    
models.py

admin.py

In this file, we import and register our created model. By doing so, we can see the model when logged in as an admin.

from django.contrib import admin
from .models import CRUD

admin.site.register(CRUD)
admin.py

Create a file and name it forms.py

The forms file is responsible for creating Django forms, which are like HTML forms, but dynamic.

forms.py

from django import forms
from .models import CRUD


class CRUDFORM(forms.ModelForm):
    name = forms.CharField(widget=forms.TextInput(attrs={
        "class": "form-control",
        "placeholder": "name"
    }))
    age= forms.CharField(widget=forms.TextInput(attrs={
        'type': "number",
        "class": "form-control",
        "placeholder": "age"
    }))
    
    level = forms.CharField(widget=forms.TextInput(attrs={
        "class": "form-control",
        "placeholder": "level"
    }))
    class Meta:
        model = CRUD
        fields = [
            'name', 'age','level'
        ]

    
forms.py

views.py

This file is used to create functions or classes that visualize how a route will operate.

from django.shortcuts import redirect, render, get_object_or_404
from .models import CRUD
from .forms import CRUDFORM

def home(request):
  queryset = CRUD.objects.all().order_by('-date')
  context = {
      'queryset': queryset
  }
  return render(request, 'app/base.html', context)


def create(request):
  form = CRUDFORM(request.POST or None)
  if request.method == "POST":
      if form.is_valid():
          form.save()
          return redirect ('home')
  context = {
      "form":form
  }
  return render(request, 'app/createform.html', context)


def detail(request, detail_id):
  data = get_object_or_404(CRUD, pk=detail_id)
  context = {
      "data":data
  }
  return render(request, "app/detail.html", context)
views.py

In the codebase app, create a folder and name it templates. Inside the templates folder, create another folder and name it app. Then, inside the app folder, create base.html, detail.html, and createform.html files.

base.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Crud</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-giJF6kkoqNQ00vy+HMDP7azOuL0xtbfIcaT9wjKHr8RbDVddVHyTfAAsrekwKmP1" crossorigin="anonymous">
</head>
<body>
    
    <div class="container mt-3">
        <!-- this code block is used to used to create a url link -->
        <a href="{% url 'create'%}" >link to create a form</a>
        <hr>
        <!-- this code block is used to loop the database -->
        {% for data in queryset %}
        <div class="list-group mb-3">
            <!-- this code block is used to used to create a url link -->
            <!-- double curly braces is used to display data from the database -->
            <a href="{% url 'detail' data.id %}" class="list-group-item list-group-item-action">Name: {{data.name}}</a>
            <a href="#" class="list-group-item list-group-item-action">Age: {{data.age}}</a>
            <a href="#" class="list-group-item list-group-item-action">Level: {{data.level}}</a>
        </div>
        <!-- end of the loop -->
        {% endfor %}
        <hr>

        
    </div>
</body>
</html>

createform.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Crud</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-giJF6kkoqNQ00vy+HMDP7azOuL0xtbfIcaT9wjKHr8RbDVddVHyTfAAsrekwKmP1" crossorigin="anonymous">
</head>
<body>
    <div class="container mt-5">
        <form method="POST" action="">
            <!-- for csrf token -->
            {% csrf_token %}
            <div class="form-group mb-3">
                <!-- double curly braces is used to display data from the database -->
                {{form.name}}
                {{form.name.errors}}
            </div>
            <div class="form-group mb-3">
                {{form.age}}
                {{form.age.errors}}
            </div>
            <div class="form-group mb-3">
                {{form.level}}
                {{form.level.errors}}
            </div>
            <input type="submit" class="btn btn-outline-success" >
            
        </form>
        <!DOCTYPE html>
        <a href="{% url 'home'%}">Home</a>
    
    </div>
</body>
createform.html

detail.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/css/bootstrap.min.css"
        rel="stylesheet" 
        integrity="sha384-giJF6kkoqNQ00vy+HMDP7azOuL0xtbfIcaT9wjKHr8RbDVddVHyTfAAsrekwKmP1" crossorigin="anonymous">
</head>
<body>
    <a href="{% url 'home'%}">Home</a>
    <!-- double curly braces is used to display data from the database -->
    <li>{{data.name}}</li>
    <li>{{data.age}}</li>
    <li>{{data.level}}</li>
</body>
</html>
detail.html

In the urls.py file in the crud folder, add the code below.

urls.py

from django.contrib import admin
from django.urls import path, include

urlpatterns = [
    path('admin/', admin.site.urls),
    # including the codebase urls.py file
    path('', include('codebase.urls'))
]

Then, in the codebase folder, create a file and name it urls.py.

urls.py is responsible for creating different routes.

urls.py

from django.urls import path
from .view import home, create, detail


urlpatterns = [
    path('',home, name="home" ),
    path('create/', create, name="create"),
    path('detail/<int:detail_id>/', detail, name="detail"),
]
urls.py

Run the following commands:

python manage.py makemigrations

python manage.py migrate

In case you want to create a super-user, run the following command:

python manage.py createsuperuser

After that, run:

python manage.py runserver

Then, go to http://127.0.0.1:8000/admin and login in order to access the admin panel.

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