Django filter example

Django-filter provides a simple way to filter down a queryset based on parameters a user provides. Say we have a Product model and we want to let our users filter which products they see on a list page. We create a FilterSet for this:.

Just like with a ModelForm we can also override filters, or add new ones using a declarative syntax. The declarative syntax provides you with the most flexibility when creating filters, however it is fairly verbose. The FilterSet Meta class provides a fields attribute that can be used for easily specifying multiple filters without significant code duplication.

The base syntax supports a list of multiple field names:. Like django. The FilterSet may be initialized with an optional request argument. If a request object is passed, then you may access the request during filtering.

This allows you to filter by properties on the request, such as the currently logged-in user or the Accepts-Languages header. It is not guaranteed that a request will be provied to the FilterSet instance. Any code depending on a request should handle the None case. To filter the primary queryset by the request object, simply override the FilterSet.

If a callable is passed, it will be invoked with the request as its only argument. This allows you to perform the same kinds of request-based filtering without resorting to overriding FilterSet. You can control the behavior of a filter by specifying a method to perform filtering. View more information in the method reference.

Django Tutorial: Making Your Own Template Filters

If you want to access the filtered objects in your views, for example if you want to paginate them, you can do that. They are in f. The form attribute contains a normal Django form, and when we iterate over the FilterSet. A legacy functional generic view is still included in django-filter, although its use is deprecated.

You must provide the same arguments to it as the class based view:. The needed template and its context variables will also be the same as the class-based view above. ForeignKey Manufacturer. Generating filters with Meta.

Note It is not guaranteed that a request will be provied to the FilterSet instance. Filtering the primary.If you want to build a list page that allows filtering and pagination, you have to get a few separate things to work together. Django provides some tools for pagination, but the documentation doesn't tell us how to make that work with anything else. The heart of the problem is that both features use query parameters, and we need to find a way to let each feature control its own query parameters without breaking the other one.

Let's start with a review of filtering, with an example of how you might subclass ListView to add filtering. See that link for how to write a filterset. And here's part of the template that uses a form created by the filterset to let the user control the filtering. I'm going to digress slightly here, and show a way to give filters default values, so when a user loads a page initially, for example, the items will be sorted with the most recent first.

I tried some other approaches, but this seemed to work out the simplest, in that it didn't break or complicate things anywhere else.

django filter example

Django's ListView has some built-in support for pagination, which is easy enough to enable:. To tell the view which page to display, we want to add a query parameter named page whose value is a page number. In the simplest case, we can just make a link with? Unfortunately, linking to pages as described above breaks filtering. More specifically, whenever you follow one of those links, the view will forget whatever filtering the user has applied, because that filtering is also controlled by query parameters, and these links don't include the filter's parameters.

It would be nice if Django helped out with a way to build links that set one query parameter without losing the existing ones, but I found a nice example of a template tag on StackOverflow and modified it slightly into this custom template tag that helps with that:. Here's how you can use that template tag to build pagination links that preserve other query parameters used for things like filtering:.

I haven't tried it, but if you need something more sophisticated for building these kinds of links, django-qurl-templatetag might be worth looking at. Toggle navigation.

Angle Left Back to blog. Dan Poirier. Filters Let's start with a review of filtering, with an example of how you might subclass ListView to add filtering.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. It has to be a filter on User and it has to be a single filter parameter. Here is syntax for your specific problem:.

Django Filter And Pagination Example

Note that if the user may be in multiple zones used in the query, you may probably want to add. Otherwise you get one user multiple times:. Learn more. Asked 10 years, 2 months ago. Active 5 years, 6 months ago. Viewed 99k times. I have a model: class Zone models. Andy Baker Andy Baker I'm not sure if I get you right - isn't User. That's ok : BTW User. Active Oldest Votes. Just restating what Tomasz said.

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Thanks maxm. Updated with a more current link to some examples. Can you please say, what to do if I want the users who are in a set of zones not just any one of them? Lets say find user who are in zone1, zone3. Look at the Or add a 4th if needed.

django filter example

I was only filtering against a single value, instead of an array containing the single value. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Socializing with co-workers while social distancing. Podcast Programming tutorials can be a real drag.

Plain Vanilla Filtering

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I also enjoy discussions on entrepreneurship and software marketing. Django template tags and filters are huge time-savers and help you keep your presentation logic DRY and easy to maintain. Tags and filters are just small bits of code that allow you to perform formatting and simple presentation-related logic right in your template.

Django filters are simple Python functions that accept a value, an optional argument, and return a value to be displayed on the page.

django filter example

Out of the box, Django includes a significant number of template filters - you can see the full list here. Let's look at an example: the phone2numeric filter that's built-in to Django. The phone2numeric template filter accepts a vanity phone number, something like FLOWERS, and displays the actual digits on a telephone keypad: Keeping a conversion process like this in your template makes sense: you don't have to worry about handling this logic in your controller every time there is a page request and you also don't need to store the original and converted values in your model.

It wasn't long after I started working with Django that I discovered the need to make my own custom template filter. Being a Django beginner at the time, I was afraid that the process might be a bit out of my comfort zone as far as complexity is concerned.

Fortunately, that is not the case. Making your own template filters is easy and allows you to do some pretty creative formatting in templates. First of all, you'll want to create a directory for holding your custom template filters.

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This is a requirement: custom template filters must live inside a Django app. Note that if you plan on building a small library of custom tags or filters, to be used across an entire project, you could create a Django app just for holding these files. If not, keep it simple: each app gets a templatetags directory at the same level as the models and views.

Consider a simple To-Do list application, a display made up of individual to-do items. The ToDo model consists of a name and a due date. Instead of just spitting out the date, we can format it to read "Due in 3 days" or add extra emphasis if the item is past due. Library bit? Well, you need to make sure that your templates are added to the existing library of tags and filters that Django knows about.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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Django-filter is a reusable Django application allowing users to declaratively add dynamic QuerySet filtering from URL parameters. Full documentation on read the docs.

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From Version 2. If you need to support Python 2. For example, if you had a Product model you could have a filterset for it with the code:. For more details see the DRF integration docs. If you have questions about usage or development you can join the mailing list. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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Python Branch: master. Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Latest commit Mar 26, Requirements Python : 3. Installation Install using pip: pip install django-filter. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Update CI Mar 4, Update issue templates.

Jul 19, Drop Django 2. Mar 12, Update supported versions Mar 20, Bump pyyaml from 3. May 24, Corrected typo in test comment.But that example do not provide two important feature, one is search and the other is result list pagination.

This article will add the two features to it. All the source code is based on the previous example. First let us look at the picture below to see what the function looks like.

The search result has also been paginated. Each page will only show two user records. To demo the function, you need to first add more users by click the Add button.

django filter example

Because i add 3 user whose name contains j, so there are two pages. We will show you detail source code later.

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As you can see in above picture, there are two pages for the search result, each page display at most 2 user records. You should use Django built-in pagination library to implement this.

Paginator class to do it. First let us implement model result list pagination in python console like below, then we can add the pagination function in the web page. Import django.

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Previous Post: Django Bootstrap3 Example.The root QuerySet provided by the Manager describes all objects in the database table. Usually, though, you'll need to select only a subset of the complete set of objects. The default behavior of REST framework's generic list views is to return the entire queryset for a model manager.

Often you will want your API to restrict the items that are returned by the queryset. The simplest way to filter the queryset of any view that subclasses GenericAPIView is to override the.

Overriding this method allows you to customize the queryset returned by the view in a number of different ways. You might want to filter the queryset to ensure that only results relevant to the currently authenticated user making the request are returned.

You could then write a view that returned a purchase queryset filtered by the username portion of the URL:. A final example of filtering the initial queryset would be to determine the initial queryset based on query parameters in the url. We can override. As well as being able to override the default queryset, REST framework also includes support for generic filtering backends that allow you to easily construct complex searches and filters.

For example. You can also set the filter backends on a per-view, or per-viewset basis, using the GenericAPIView class-based views. Note that if a filter backend is configured for a view, then as well as being used to filter list views, it will also be used to filter the querysets used for returning a single object. For instance, given the previous example, and a product with an id ofthe following URL would either return the corresponding object, or return a response, depending on if the filtering conditions were met by the given product instance:.

Note that you can use both an overridden. For example, if Product had a many-to-many relationship with Usernamed purchaseyou might want to write a view like this:. To use DjangoFilterBackendfirst install django-filter. This will automatically create a FilterSet class for the given fields, and will allow you to make requests such as:. For more advanced filtering requirements you can specify a FilterSet class that should be used by the view.

11 - Add filters, sorting and search in GET APIs using Django Rest Framework - by Hardik Patel

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