feat(select-input): add field value to collection if tags true

Author: difernandez

app/inputs/active_admin/inputs/select_input.rb

@@ -2,4 +2,10 @@ class ActiveAdmin::Inputs::SelectInput < Formtastic::Inputs::SelectInput
   def input_html_options
     super.merge(data: { tags: @options[:tags].present? })
   end
+
+  def raw_collection
+    field_value = object.send(method)
+
+    @options[:tags].present? && field_value.present? ? (super.to_a << field_value).uniq : super
+  end
 end

spec/features/inputs/select2_spec.rb

@@ -40,6 +40,17 @@
           expect_select2_options_count_to_eq(5)
         end
       end
+
+      context 'when initial value is not in inputs collection' do
+        before do
+          invoice.update!(number: selection)
+          visit edit_admin_invoice_path(invoice)
+        end
+
+        it "includes initial value as option", js: true do
+          expect_select2_options_count_to_eq(5)
+        end
+      end
     end
 
     context "with tags: false option" do