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How to Customize Middlewares In Django

What is middleware?

Middleware is a framework of hooks which works as a ‘plugin’ between Django’s request/response processing. In other words a middleware is a callable that takes a request and returns a response just like a view. Each middleware component is responsible for doing some specific task.

In simple word middlewares are Mediators between client & view.

Let me clear the concept with an example:

Suppose you want to send a letter to your best friend through a post office. You completed the letter & went to post office, but post master told you that you didn't follow the perfect rules to send a letter. Then you corrected it. After that the postmaster received it & sent it to the post office nearer to your friends home. A postman will take the letter from there & deliver it to your friends home. Here, a problem can be happened too. If you make mistake in writing the address then it won't be possible to deliver. But if everything is okey the letter will be delivered on time. Then by following the same procedure your friend can send you a response.

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Serving StaticFiles In Django Project

What are static files?

Files used for making beautiful user interface, interactive user experience and functional web pages are called static files. They do not change when a application is running. They aren’t dynamically generated by Python web server. Most common static-files in a typical web application  are the following types:

  • CSS (Cascading Style Sheets)
  • JavaScript
  • Images

Static files are important for a Django project because the modern web requires more than dynamically generated HTML markup. Let’s see how to configure an application to serve static files. After that we will work with some examples.

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Cookie in Django | Django Tutorial

What is Cookie?

A cookie is a small piece of text file that contains data. The data in the cookie is often a random key or token. The server use a cookie to identify a client. Specific cookie known as HTTP cookie is used to identify a specific user and to keep track of that user's movements within the site.

Suppose, you have visited a shop for the first time & bought some cloths of your favorite color. The owner has given you a membership card. Now, if you go again, he might not remember your face but he will recognize the card issued by his shop & can find your buying history & can serve you well. Here, the shop is the web server, you are the client and the membership card is the cookie. As the membership card will not be valid for other shops similarly a cookie won’t be valid for a different website.

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Django Sessions | Django Tutorial

Communication between web browsers (clients) and servers is completed via HTTP( Hyper Text Transfer Protocol). It is a stateless protocol. This means a HTTP server does not keep track of any state information. The server will not remember whether a client has visited it before. Each time a client visits the server behaves with it as a new client. The sessions make a stateless protocol stateful.

Django has a session framework which handles cookies. In cookies we store session_key. It is a unique 32-character-long random string. A session_key can be considered as a token (a sequence of characters). It identifies a unique session within a particular web application. Sessions are used to abstract the receiving and sending of cookies, data is saved on server-side, and a session_key is stored in the client-side cookie for identification.

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Custom Template Filter in Django | Django Tutorial

We have already discussed Django Template Tags. In this tutorial, we will work with Django Custom Template Filter.

What is a Template Filter in Django?

A template filter is simply a feature that can transform the value of a template variable before it is displayed.

Syntax

{{ variable_name | filter_name }}

Built-In Django Template Filters

There are some inbuilt filters in Django. Let's see some of them first.

lower

To convert the value of a variable into lower case characters:

{{ variable | lower }}

If value is “Bangladesh”, the output will be “bangladesh”.

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Django Authentication SignUpView -LoginView-LogoutView

In this tutorial, we'll discuss 'how to allow users to log in to a website with their own accounts and how to allow them to create accounts. The mechanisms work behind the scene is called authentication.

Authentication verifies a user if he is who he pretends to be, and authorization determines what an authenticated user can do.

Django by default has a user authentication system. It handles user accounts, groups, permissions and cookie-based user sessions. We will discuss the following topics here:

  • Default User Model
  • Creating User
  • Creating Super User
  • Authenticating User
  • Authentication Views
    • Log In
    • Log Out
    • Sign Up / Registration

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Django Custom Template Tags | Django Tutorial

Template tags are code snippets used to add functionality in templates. Django offers a variety of template tags such as {% if %}, {% for %}, {% block %}. Besides, Django allows us to create our own set of custom tags and make them available in the Django templates. We can extend the template engine by defining custom tags. Then it will be available to our templates. In this tutorial, we will discuss Django Custom Template Tags.

Why We Use Template Tags in Django

Suppose, we have an eCommerce website to build. It will contain multiple category products and we will have to show all the categories in our 'navbar'. To do this we will have to pass the queryset 'Categories.objects.all()' from each of our views to show in each template. But, Using template tags we can skip this redundancy. We will make a custom template tag that will show all the categories and load it into our 'base.html' file.

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Django Custom Model Manager | Model Manager

Django Custom Model Manager

In this article we are going to discuss Django Custom Model Manager & Django Default Model Manager. So, What is a manager?

A Manager is a bridge through which database queries talk with Django models. In other words, it is actually an interface which interacts with application and database. There is at least one Manager that exists for every model in a Django application named objects. It is the default manager of every model that retrieves data from the database.

In this article we will discuss about creating Custom Model Managers & why should we use them.

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Django Form and ModelForm | Django Tutorial

Forms are basically used for taking input from the user. For adding, updating, retrieving that information to databases using GET or POST request. There is two forms classes in Django which is used to create HTML forms. Form & ModelForm. The difference between the Form & ModelForm class is that ModelForm class needs a model to create a form, but the Form class does not require a Model. We will discuss both here. Each field of the Form class map to the HTML form  <input>  element and each field has custom validation logic. Django does three distinct parts of the work involved in forms:

  • Prepares and Restructures data to make it ready for rendering
  • Creates HTML forms for the data.
  • Receives and Processes submitted data from the user.

forms.Form

Creating forms in Django is similar to creating a model. We just need to inherit from Django Form class and the attributes of the class will be the form fields. 

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get_context_data() | Multiple Models data in a View

Did you face the problem of fetching data from multiple models in a single view while developing your Django application?

For example, Think of showing all the cars owned by a person in the person's detail view. The generic DetailView provides the Person's object to the context, but how do we get information of cars in that template? In this article, we will find out the solution.

The solution is to override the get_context_data() method of generic views. This method returns a dictionary. This method is used to populate the 'context' (can be named anything) dictionary to use as the template context.

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