Refactor select2 tags

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/helpers/namespaces_helper.rb

@@ -17,15 +17,6 @@ module NamespacesHelper
     grouped_options_for_select(options, selected)
   end
-  def namespace_select_tag(id, opts = {})
-    css_class = "ajax-namespace-select "
-    css_class << "multiselect " if opts[:multiple]
-    css_class << (opts[:class] || '')
-    value = opts[:selected] || ''
-
-    hidden_field_tag(id, value, class: css_class)
-  end
-
   def namespace_icon(namespace, size = 40)
     if namespace.kind_of?(Group)
       group_icon(namespace)

app/helpers/selects_helper.rb

@@ -35,8 +35,20 @@ module SelectsHelper
   end
   def groups_select_tag(id, opts = {})
-    css_class = "ajax-groups-select "
-    css_class << "multiselect " if opts[:multiple]
+    opts[:class] ||= ''
+    opts[:class] << ' ajax-groups-select'
+    select2_tag(id, opts)
+  end
+
+  def namespace_select_tag(id, opts = {})
+    opts[:class] ||= ''
+    opts[:class] << ' ajax-namespace-select'
+    select2_tag(id, opts)
+  end
+
+  def select2_tag(id, opts = {})
+    css_class = ''
+    css_class << 'multiselect ' if opts[:multiple]
     css_class << (opts[:class] || '')
     value = opts[:selected] || ''