Add autocomplete functionality for parks: implement URLs, views, and templates for real-time suggestions

autocomplete/__init__.py

@@ -0,0 +1,49 @@
+default_app_config = 'autocomplete.apps.AutocompleteConfig'
+
+from django.db import models
+from django.core.exceptions import ImproperlyConfigured
+from django.forms.widgets import Widget
+from django.template.loader import render_to_string
+
+
+class ModelAutocomplete:
+    """Base class for model-based autocomplete."""
+    model = None  # Model class to use for autocomplete
+    search_attrs = []  # List of model attributes to search
+    minimum_search_length = 2  # Minimum length of search string
+    max_results = 10  # Maximum number of results to return
+
+    def __init__(self):
+        if not self.model:
+            raise ImproperlyConfigured("ModelAutocomplete requires a model class")
+        if not self.search_attrs:
+            raise ImproperlyConfigured("ModelAutocomplete requires search_attrs")
+
+    def get_search_results(self, search):
+        """Return search results for a given search string."""
+        raise NotImplementedError("Subclasses must implement get_search_results()")
+
+    def format_result(self, obj):
+        """Format a single result object."""
+        raise NotImplementedError("Subclasses must implement format_result()")
+
+
+class AutocompleteWidget(Widget):
+    """Widget for autocomplete fields."""
+    template_name = 'autocomplete/widget.html'
+
+    def __init__(self, ac_class, attrs=None):
+        super().__init__(attrs)
+        if not issubclass(ac_class, ModelAutocomplete):
+            raise ImproperlyConfigured("ac_class must be a subclass of ModelAutocomplete")
+        self.ac_class = ac_class
+
+    def get_context(self, name, value, attrs):
+        context = super().get_context(name, value, attrs)
+        # Add ac_name for URL resolution
+        context['ac_name'] = self.ac_class.__name__.lower()
+        return context
+
+    def render(self, name, value, attrs=None, renderer=None):
+        context = self.get_context(name, value, attrs)
+        return render_to_string(self.template_name, context)