feat: autocomplete filters (#1010)

README.md

@@ -27,7 +27,7 @@ Have you decided to start using Unfold but don’t have time to make the switch
 - **Sidebar:** Simplifies the creation of sidebar navigation with icons, collapsibles, and more.
 - **Dark mode:** Supports both light and dark mode versions.
 - **Actions:** Offers multiple ways to define actions within different parts of the admin interface.
-- **Filters:** Custom dropdowns, numeric, datetime, and text fields.
+- **Filters:** Custom dropdowns, autocomplete, numeric, datetime, and text fields.
 - **Dashboard:** Includes helpers for creating custom dashboard pages.
 - **Components:** Reusable UI components such as cards, buttons, and charts.
 - **WYSIWYG widget:** Built-in support for WYSIWYG (Trix).

docs/filters/autocomplete.md

@@ -0,0 +1,37 @@
+---
+title: Autocomplete filter
+order: 5
+description: Autocomplete filters for changelist view.
+---
+
+# Autocomplete filters
+
+Unfold provides two different types of autocomplete filters: `AutocompleteSelectFilter` and `AutocompleteSelectMultipleFilter`. Both of them are implemented in `unfold.contrib.filters` so make sure this app is in your `INSTALLED_APPS` in `settings.py`.
+
+All the referenced fields must be `ForeignKey` or `ManyToManyField` fields and the same time the referenced admin model must have defined `search_fields` attribute otherwise the application will raise an error.
+
+```python
+# admin.py
+
+from django.contrib import admin
+from django.contrib.auth.models import User
+
+from unfold.admin import ModelAdmin
+from unfold.contrib.filters.admin import (
+    AutocompleteSelectFilter,
+    AutocompleteSelectMultipleFilter
+)
+
+@admin.register(User)
+class YourModelAdmin(ModelAdmin):
+    list_filter = (
+        # Autocomplete filter
+        ["other_model_field", AutocompleteSelectFilter],
+
+        # Autocomplete multiple filter
+        ["other_multiple_model_field", AutocompleteSelectMultipleFilter],
+    )
+
+class OtherModelAdmin(ModelAdmin):
+    search_fields = ["name"]
+```