# documentación de Django - 5.2.8

# Django 5.2 release notes

April 2, 2025

Welcome to Django 5.2!

These release notes cover the new features, as well as some backwards incompatible changes you should be aware of when upgrading from Django 5.1 or earlier. We’ve begun the deprecation process for some features.

See the How to upgrade Django to a newer version guide if you’re updating an existing project.

Django 5.2 is designated as a long-term support release. It will receive security updates for at least three years after its release. Support for the previous LTS, Django 4.2, will end in April 2026.

## Python compatibility

Django 5.2 supports Python 3.10, 3.11, 3.12, 3.13, and 3.14 (as of 5.2.8). We highly recommend and only officially support the latest release of each series.

## What’s new in Django 5.2

### Automatic models import in the `shell`

The `shell` management command now automatically imports models from all installed apps. You can view further details of the imported objects by setting the `--verbosity` flag to 2 or more:

/ 

    $ python -Wall manage.py shell --verbosity=2
    6 objects imported automatically, including:

      from django.contrib.admin.models import LogEntry
      from django.contrib.auth.models import Group, Permission, User
      from django.contrib.contenttypes.models import ContentType
      from django.contrib.sessions.models import Session

    ...\> py -Wall manage.py shell --verbosity=2
    6 objects imported automatically, including:

      from django.contrib.admin.models import LogEntry
      from django.contrib.auth.models import Group, Permission, User
      from django.contrib.contenttypes.models import ContentType
      from django.contrib.sessions.models import Session

This behavior can be customized to add or remove automatic imports.

### Composite Primary Keys

The new `django.db.models.CompositePrimaryKey` allows tables to be created with a primary key consisting of multiple fields.

To use a composite primary key, when defining a model set the `pk` attribute to be a `CompositePrimaryKey`:

    from django.db import models

    class Release(models.Model):
        pk = models.CompositePrimaryKey("version", "name")
        version = models.IntegerField()
        name = models.CharField(max_length=20)

See Composite primary keys for more details.

### Simplified override of `BoundField`

Prior to version 5.2, overriding `Field.get_bound_field()` was the only option to use a custom `BoundField`. Django now supports specifying the following attributes to customize form rendering:

- `BaseRenderer.bound_field_class` at the project level,

- `Form.bound_field_class` at the form level, and

- `Field.bound_field_class` at the field level.

For example, to customize the `BoundField` of a `Form` class:

    from django import forms

    class CustomBoundField(forms.BoundField):

        custom_class = "custom"

        def css_classes(self, extra_classes=None):
            result = super().css_classes(extra_classes)
            if self.custom_class not in result:
                result += f" {self.custom_class}"
            return result.strip()

    class CustomForm(forms.Form):
        bound_field_class = CustomBoundField

        name = forms.CharField(
            label="Your Name",
            max_length=100,
            required=False,
            widget=forms.TextInput(attrs={"class": "name-input-class"}),
        )
        email = forms.EmailField(label="Your Email")

When rendering a `CustomForm` instance, the following HTML is included:

    <div class="custom">
      <label for="id_name">Your Name:</label>
      <input type="text" name="name" class="name-input-class" maxlength="100" id="id_name">
    </div>

    <div class="custom">
      <label for="id_email">Your Email:</label>
      <input type="email" name="email" maxlength="320" required="" id="id_email">
    </div>

See Customizing BoundField for more details about this feature.

### Minor features

#### `django.contrib.admin`

- The `admin/base.html` template now has a new block extrabody for adding custom code before the closing `</body>` tag.

- The value of a `URLField` now renders as a link.

#### `django.contrib.admindocs`

- Links to components in docstrings now supports custom link text, using the format `:role:`link text <link>``. See documentation helpers for more details.

- The model pages are now restricted to users with the corresponding view or change permissions.

#### `django.contrib.auth`

- The default iteration count for the PBKDF2 password hasher is increased from 870,000 to 1,000,000.

- The following new asynchronous methods are now provided, using an `a` prefix:

  - `UserManager.acreate_user()`

  - `UserManager.acreate_superuser()`

  - `BaseUserManager.aget_by_natural_key()`

  - `User.aget_user_permissions()`

  - `User.aget_all_permissions()`

  - `User.aget_group_permissions()`

  - `User.ahas_perm()`

  - `User.ahas_perms()`

  - `User.ahas_module_perms()`

  - `ModelBackend.aauthenticate()`

  - `ModelBackend.aget_user_permissions()`

  - `ModelBackend.aget_group_permissions()`

  - `ModelBackend.aget_all_permissions()`

  - `ModelBackend.ahas_perm()`

  - `ModelBackend.ahas_module_perms()`

  - `RemoteUserBackend.aauthenticate()`

  - `RemoteUserBackend.aconfigure_user()`

- Auth backends can now provide async implementations which are used when calling async auth functions (e.g. `aauthenticate()`) to reduce context-switching which improves performance. See adding an async interface for more details.

- The password validator classes now have a new method `get_error_message()`, which can be overridden in subclasses to customize the error messages.

#### `django.contrib.gis`

- GDAL now supports curved geometries `CurvePolygon`, `CompoundCurve`, `CircularString`, `MultiSurface`, and `MultiCurve` via the new `OGRGeometry.has_curve` property, and the `OGRGeometry.get_linear_geometry()` and `OGRGeometry.get_curve_geometry()` methods.

- `coveredby` and `covers` lookup are now supported on MySQL.

#### `django.contrib.syndication`

- All `SyndicationFeed` classes now support a `stylesheets` attribute. If specified, an `<? xml-stylesheet ?>` processing instruction will be added to the top of the document for each stylesheet in the given list. See Feed stylesheets for more details.

#### Database backends

- MySQL connections now default to using the `utf8mb4` character set, instead of `utf8`, which is an alias for the deprecated character set `utf8mb3`.

- Oracle backends now support connection pools, by setting `"pool"` in the `OPTIONS` part of your database configuration.

#### Decorators

- `method_decorator()` now supports wrapping asynchronous view methods.

#### Email

- Tuple items of `EmailMessage.attachments` and `EmailMultiAlternatives.attachments` are now named tuples, as opposed to regular tuples.

- `EmailMultiAlternatives.alternatives` is now a list of named tuples, as opposed to regular tuples.

- The new `body_contains()` method returns a boolean indicating whether a provided text is contained in the email `body` and in all attached MIME type `text/*` alternatives.

#### Error Reporting

- The attribute `SafeExceptionReporterFilter.hidden_settings` now treats values as sensitive if their name includes `AUTH`.

#### Forms

- The new `ColorInput` form widget is for entering a color in `rrggbb` hexadecimal format and renders as `<input type="color" ...>`. Some browsers support a visual color picker interface for this input type.

- The new `SearchInput` form widget is for entering search queries and renders as `<input type="search" ...>`.

- The new `TelInput` form widget is for entering telephone numbers and renders as `<input type="tel" ...>`.

- The new `field_id` argument for `ErrorList` allows an HTML `id` attribute to be added in the error template. See `ErrorList.field_id` for details.

- An `aria_describedby` property is added to `BoundField` to ease use of this HTML attribute in templates.

- To improve accessibility for screen reader users `aria-describedby` is used to associate form fields with their error messages. See how form errors are displayed for details.

- The new asset object `Script` is available for adding custom HTML-attributes to JavaScript in form media. See paths as objects for more details.

#### Management Commands

- A new warning is displayed when running `runserver`, indicating that it is unsuitable for production. This warning can be suppressed by setting the `DJANGO_RUNSERVER_HIDE_WARNING` environment variable to `"true"`.

- The `makemigrations` and `migrate` commands have a new `Command.autodetector` attribute for subclasses to override in order to use a custom autodetector class.

- The new `BaseCommand.get_check_kwargs()` method can be overridden in custom commands to control the running of system checks, e.g. to opt into database-dependent checks.

#### Migrations

- The new operation `AlterConstraint` is a no-op operation that alters constraints without dropping and recreating constraints in the database.

#### Models

- The `SELECT` clause generated when using `QuerySet.values()` and `QuerySet.values_list()` now matches the specified order of the referenced expressions. Previously, the order was based on a set of counterintuitive rules which made query combination through methods such as `QuerySet.union()` unpredictable.

- Added support for validation of model constraints which use a `GeneratedField`.

- The new `Expression.set_returning` attribute specifies that the expression contains a set-returning function, enforcing subquery evaluation. This is necessary for many Postgres set-returning functions.

- `CharField.max_length` is no longer required to be set on SQLite, which supports unlimited `VARCHAR` columns.

- `QuerySet.explain()` now supports the `memory` and `serialize` options on PostgreSQL 17+.

- The new `JSONArray` database function accepts a list of field names or expressions and returns a JSON array containing those values.

- The new `Expression.allows_composite_expressions` attribute specifies that the expression allows composite expressions, for example, to support composite primary keys.

#### Requests and Responses

- The new `HttpResponse.text` property provides the string representation of `HttpResponse.content`.

- The new `HttpRequest.get_preferred_type()` method can be used to query the preferred media type the client accepts.

- The new `preserve_request` argument for `HttpResponseRedirect` and `HttpResponsePermanentRedirect` determines whether the HTTP status codes 302/307 or 301/308 are used, respectively.

- The new `preserve_request` argument for `redirect()` allows to instruct the user agent to reuse the HTTP method and body during redirection using specific status codes.

#### Serialization

- Each serialization format now defines a `Deserializer` class, rather than a function, to improve extensibility when defining a custom serialization format.

#### Templates

- The new `simple_block_tag()` decorator enables the creation of simple block tags, which can accept and use a section of the template.

#### Tests

- Stack frames from Django’s custom assertions are now hidden. This makes test failures easier to read and enables `test --pdb` to directly enter into the failing test method.

- Data loaded from `fixtures` and from migrations enabled with serialized_rollback=True are now available during `TransactionTestCase.setUpClass()`.

#### URLs

- `reverse()` and `reverse_lazy()` now accept `query` and `fragment` keyword arguments, allowing the addition of a query string and/or fragment identifier in the generated URL, respectively.

#### Utilities

- `SafeString` now returns `NotImplemented` in `__add__` for non-string right-hand side values. This aligns with the `str` addition behavior and allows `__radd__` to be used if available.

- `format_html_join()` now supports taking an iterable of mappings, passing their contents as keyword arguments to `format_html()`.

## Backwards incompatible changes in 5.2

### Database backend API

This section describes changes that may be needed in third-party database backends.

- The new `Model._is_pk_set()` method allows checking if a Model instance’s primary key is defined.

- `BaseDatabaseOperations.adapt_decimalfield_value()` is now a no-op, simply returning the given value.

### `django.contrib.gis`

- Support for PostGIS 3.0 is removed.

- Support for GDAL 3.0 is removed.

### Dropped support for PostgreSQL 13

Upstream support for PostgreSQL 13 ends in November 2025. Django 5.2 supports PostgreSQL 14 and higher.

### Changed MySQL connection character set default

MySQL connections now default to using the `utf8mb4` character set, instead of `utf8`, which is an alias for the deprecated character set `utf8mb3`. `utf8mb3` can be specified in the `OPTIONS` part of the `DATABASES` setting, if needed for legacy databases.

### Miscellaneous

- Adding `EmailMultiAlternatives.alternatives` is now only supported via the `attach_alternative()` method.

- The minimum supported version of `gettext` is increased from 0.15 to 0.19.

- `HttpRequest.accepted_types` is now sorted by the client’s preference, based on the request’s `Accept` header.

- The attributes `UniqueConstraint.violation_error_code` and `UniqueConstraint.violation_error_message` are now always used when provided. Previously, they were ignored if `UniqueConstraint.fields` was set without a `UniqueConstraint.condition`.

- The `debug()` context processor is no longer included in the default project template.

- The following methods now have `alters_data=True` set to prevent side effects when rendering a template context:

  - `UserManager.create_user()`

  - `UserManager.acreate_user()`

  - `UserManager.create_superuser()`

  - `UserManager.acreate_superuser()`

  - `QuerySet.create()`

  - `QuerySet.acreate()`

  - `QuerySet.bulk_create()`

  - `QuerySet.abulk_create()`

  - `QuerySet.get_or_create()`

  - `QuerySet.aget_or_create()`

  - `QuerySet.update_or_create()`

  - `QuerySet.aupdate_or_create()`

- The minimum supported version of `oracledb` is increased from 1.3.2 to 2.3.0.

- Built-in aggregate functions accepting only one argument (`Avg`, `Count`, `Max`, `Min`, `StdDev`, `Sum`, and `Variance`) now raise `TypeError` when called with an incorrect number of arguments.

## Features deprecated in 5.2

### Miscellaneous

- The `all` argument for the `django.contrib.staticfiles.finders.find()` function is deprecated in favor of the `find_all` argument.

- Fallbacks to `request.user` and `request.auser()` when `user` is `None` in `django.contrib.auth.login()` and `django.contrib.auth.alogin()`, respectively, are deprecated.

- The `ordering` keyword argument of the PostgreSQL specific aggregation functions `django.contrib.postgres.aggregates.ArrayAgg`, `django.contrib.postgres.aggregates.JSONBAgg`, and `django.contrib.postgres.aggregates.StringAgg` is deprecated in favor of the `order_by` argument.

- Support for subclasses of `RemoteUserMiddleware` that override `process_request()` without overriding `aprocess_request()` is deprecated.