Merge pull request #322 from platanus/default-select-tags-support

Default select tags support

Author: difernandez

app/inputs/active_admin/inputs/select_input.rb

@@ -0,0 +1,11 @@
+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

docs/select2_default.md

@@ -25,3 +25,7 @@ Now, if you want to enable [select2](http://ivaynberg.github.io/select2/) for a
 ```
 f.input :created_at, input_html: { class: "select2" }
 ```
+
+### Options
+
+* `tags`: **(optional)** boolean option, by **default** it's `false`. If `true`, it allows dynamic option creation [as described here](https://select2.org/tagging). It will also add the input's initial value to the select options if it's not in the supplied collection. Note that, unlike the `tags_input`, this does not allow multiple values. Only available for form inputs, not filters.

spec/features/inputs/select2_spec.rb

@@ -20,6 +20,60 @@
       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
+
+      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
+      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