Fix enum filter breaking when pre-populated

Fixes #3651

Author: mshibuya

app/helpers/rails_admin/main_helper.rb

@@ -45,7 +45,7 @@ def ordered_filter_options
           filter_for_field = duplet[1]
           filter_name = filter_for_field.keys.first
           filter_hash = filter_for_field.values.first
-          unless (field = filterable_fields.find { |f| f.name == filter_name.to_sym })
+          unless (field = filterable_fields.find { |f| f.name == filter_name.to_sym }&.with({view: self}))
             raise "#{filter_name} is not currently filterable; filterable fields are #{filterable_fields.map(&:name).join(', ')}"
           end
 

spec/integration/widgets/filter_box_spec.rb

@@ -157,7 +157,7 @@
   describe 'for enum field' do
     before do
       RailsAdmin.config Team do
-        field :color
+        field :color, :enum
       end
     end
 
@@ -170,6 +170,15 @@
       expect(find('#filters_box select')['multiple']).to be true
       expect(find('#filters_box select')['name']).to match(/\[\]$/)
     end
+
+    context 'with the filter pre-populated' do
+      it 'does not break' do
+        visit index_path(model_name: 'team', f: {color: {'1' => {v: 'red'}}})
+        is_expected.to have_css('.filter select[name^="f[color]"]')
+        expect(find('.filter select[name^="f[color]"]').value).to eq 'red'
+        expect(all('#filters_box option').map(&:text)).to include 'white', 'black', 'red', 'green', 'blu<e>é'
+      end
+    end
   end
 
   describe 'for time field', active_record: true do