feat(inputs): add SelectInput with wupport foor tags option

Author: difernandez

app/inputs/active_admin/inputs/select_input.rb

@@ -0,0 +1,5 @@
+class ActiveAdmin::Inputs::SelectInput < Formtastic::Inputs::SelectInput
+  def input_html_options
+    super.merge(data: { tags: @options[:tags].present? })
+  end
+end

spec/features/inputs/select2_spec.rb

@@ -20,6 +20,49 @@
       expect(page).not_to have_selector("select.default-select")
       expect(page).not_to have_selector("select.select2")
     end
+
+    context "with tags: true option" do
+      let(:invoice) { create_invoice }
+      let(:selection) { '#444' }
+
+      before do
+        register_form(Invoice) do |f|
+          f.input :number, as: :select, collection: ["#111", "#222", "#333"], tags: true
+        end
+      end
+
+      context 'when entering option not in collection' do
+        before { visit edit_admin_invoice_path(invoice) }
+
+        it "adds new option", js: true do
+          expect_select2_options_count_to_eq(4)
+          fill_select2_input(selection)
+          expect_select2_options_count_to_eq(5)
+        end
+      end
+    end
+
+    context "with tags: false option" do
+      let(:selection) { '#444' }
+
+      before do
+        register_form(Invoice) do |f|
+          f.input :number, as: :select, collection: ["#111", "#222", "#333"], tags: false
+        end
+      end
+
+      context 'when entering option not in collection' do
+        let(:selection) { '#444' }
+
+        before { visit edit_admin_invoice_path(create_invoice) }
+
+        it "doesn't add new option", js: true do
+          expect_select2_options_count_to_eq(4)
+          fill_select2_input(selection)
+          expect_select2_options_count_to_eq(4)
+        end
+      end
+    end
   end
 
   context "when default config is select 2 and select control has default-select class" do