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# -*- coding: utf-8 -*-
import urllib
from django import forms
from django.contrib.admin.sites import site
from django.contrib.admin.widgets import ForeignKeyRawIdWidget
from django.template.loader import render_to_string
from django.templatetags.static import static
from django.urls import reverse
from django.utils.safestring import mark_safe
from django.utils.text import Truncator
class ForeignKeySearchInput(ForeignKeyRawIdWidget):
"""
Widget for displaying ForeignKeys in an autocomplete search input
instead in a <select> box.
"""
# Set in subclass to render the widget with a different template
widget_template = None
# Set this to the patch of the search view
search_path = None
@property
def media(self):
js_files = [
static("django_extensions/js/jquery.bgiframe.js"),
static("django_extensions/js/jquery.ajaxQueue.js"),
static("django_extensions/js/jquery.autocomplete.js"),
]
return forms.Media(
css={"all": (static("django_extensions/css/jquery.autocomplete.css"),)},
js=js_files,
)
def label_for_value(self, value):
key = self.rel.get_related_field().name
obj = self.rel.model._default_manager.get(**{key: value})
return Truncator(obj).words(14, truncate="...")
def __init__(self, rel, search_fields, attrs=None):
self.search_fields = search_fields
super().__init__(rel, site, attrs)
def render(self, name, value, attrs=None, renderer=None):
if attrs is None:
attrs = {}
opts = self.rel.model._meta
app_label = opts.app_label
model_name = opts.object_name.lower()
related_url = reverse("admin:%s_%s_changelist" % (app_label, model_name))
if not self.search_path:
self.search_path = urllib.parse.urljoin(
related_url, "foreignkey_autocomplete/"
)
params = self.url_parameters()
if params:
url = "?" + "&".join(["%s=%s" % (k, v) for k, v in params.items()])
else:
url = ""
if "class" not in attrs:
attrs["class"] = "vForeignKeyRawIdAdminField"
# Call the TextInput render method directly to have more control
output = [forms.TextInput.render(self, name, value, attrs)]
if value:
label = self.label_for_value(value)
else:
label = ""
context = {
"url": url,
"related_url": related_url,
"search_path": self.search_path,
"search_fields": ",".join(self.search_fields),
"app_label": app_label,
"model_name": model_name,
"label": label,
"name": name,
}
output.append(
render_to_string(
self.widget_template
or (
"django_extensions/widgets/%s/%s/foreignkey_searchinput.html"
% (app_label, model_name),
"django_extensions/widgets/%s/foreignkey_searchinput.html"
% app_label,
"django_extensions/widgets/foreignkey_searchinput.html",
),
context,
)
)
output.reverse()
return mark_safe("".join(output))
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