Migrate snippet chooser search form to get_filter_form_class

to match generic implementation in wagtail.admin.views.generic.chooser

wagtail/snippets/templates/wagtailsnippets/chooser/choose.html

@@ -3,15 +3,19 @@
 {% include "wagtailadmin/shared/header.html" with title=choose_str subtitle=model_opts.verbose_name icon="snippet" %}
 
 <div class="nice-padding">
-    {% if is_searchable or locale or locale_options %}
+    {% if filter_form.fields or locale or locale_options %}
         <form data-chooser-modal-search class="search-bar" action="{% url 'wagtailsnippets:choose_results' model_opts.app_label model_opts.model_name %}" method="GET" novalidate>
+            {% if filter_form.hidden_fields %}
+                {% for field in form.hidden_fields %}{{ field }}{% endfor %}
+            {% endif %}
+
             {% if locale %}
                 <input type="hidden" name="locale" value="{{ locale.language_code }}">
             {% endif %}
 
-            {% if is_searchable %}
+            {% if filter_form.visible_fields %}
                 <ul class="fields">
-                    {% for field in search_form %}
+                    {% for field in filter_form.visible_fields %}
                         {% include "wagtailadmin/shared/field_as_li.html" with field=field %}
                     {% endfor %}
                     <li class="submit"><input type="submit" value="{% trans 'Search' %}" class="button" /></li>

wagtail/snippets/views/chooser.py

@@ -1,3 +1,4 @@
+from django import forms
 from django.contrib.admin.utils import quote, unquote
 from django.core.paginator import Paginator
 from django.shortcuts import get_object_or_404
@@ -6,7 +7,6 @@ from django.urls import reverse
 from django.utils.translation import gettext as _
 from django.views.generic.base import ContextMixin, View
 
-from wagtail.admin.forms.search import SearchForm
 from wagtail.admin.modal_workflow import render_modal_workflow
 from wagtail.admin.ui.tables import Table, TitleColumn
 from wagtail.models import Locale, TranslatableMixin
@@ -35,6 +35,8 @@ class SnippetTitleColumn(TitleColumn):
 
 
 class BaseChooseView(ContextMixin, View):
+    filter_form_class = None
+
     def get_object_list(self):
         objects = self.model.objects.all()
 
@@ -45,6 +47,40 @@ class BaseChooseView(ContextMixin, View):
 
         return objects
 
+    def get_filter_form_class(self):
+        if self.filter_form_class:
+            return self.filter_form_class
+        else:
+            fields = {}
+            if class_is_indexed(self.model):
+                placeholder = _("Search %(snippet_type_name)s") % {
+                    "snippet_type_name": self.model._meta.verbose_name
+                }
+                fields["q"] = forms.CharField(
+                    label=_("Search term"),
+                    widget=forms.TextInput(attrs={"placeholder": placeholder}),
+                    required=False,
+                )
+
+            return type(
+                "FilterForm",
+                (forms.Form,),
+                fields,
+            )
+
+    def get_filter_form(self):
+        FilterForm = self.get_filter_form_class()
+        return FilterForm(self.request.GET)
+
+    def filter_object_list(self, objects, form):
+        self.search_query = form.cleaned_data.get("q")
+        if self.search_query:
+            search_backend = get_search_backend()
+            objects = search_backend.search(self.search_query, objects)
+            self.is_searching = True
+
+        return objects
+
     def get(self, request, app_label, model_name):
         self.model = get_snippet_model_from_url_params(app_label, model_name)
 
@@ -76,25 +112,10 @@ class BaseChooseView(ContextMixin, View):
         self.is_searchable = class_is_indexed(self.model)
         self.is_searching = False
         self.search_query = None
-        if self.is_searchable and "q" in request.GET:
-            self.search_form = SearchForm(
-                request.GET,
-                placeholder=_("Search %(snippet_type_name)s")
-                % {"snippet_type_name": self.model._meta.verbose_name},
-            )
 
-            if self.search_form.is_valid():
+        self.filter_form = self.get_filter_form()
-                self.search_query = self.search_form.cleaned_data["q"]
+        if self.filter_form.is_valid():
-
+            objects = self.filter_object_list(objects, self.filter_form)
-                search_backend = get_search_backend()
-                objects = search_backend.search(self.search_query, objects)
-                self.is_searching = True
-
-        else:
-            self.search_form = SearchForm(
-                placeholder=_("Search %(snippet_type_name)s")
-                % {"snippet_type_name": self.model._meta.verbose_name}
-            )
 
         # Pagination
         paginator = Paginator(objects, per_page=25)
@@ -142,7 +163,7 @@ class ChooseView(BaseChooseView):
         context.update(
             {
                 "is_searchable": self.is_searchable,
-                "search_form": self.search_form,
+                "filter_form": self.filter_form,
                 "locale": self.locale,
                 "locale_filter": self.locale_filter,
                 "selected_locale": self.selected_locale,