displays only valuation tags for filtering

app/helpers/budgets_helper.rb

@@ -38,4 +38,8 @@ module BudgetsHelper
   def current_ballot
     Budget::Ballot.where(user: current_user, budget: @budget).first
   end
+
+  def investment_tags_select_options
+    Budget::Investment.tags_on(:valuation).order(:name).select(:name).distinct
+  end
 end

app/views/admin/budget_investments/index.html.erb

@@ -28,7 +28,7 @@
 
     <div class="small-12 medium-3 column">
       <%= select_tag :tag_name,
-                     options_for_select(spending_proposal_tags_select_options, params[:tag_name]),
+                     options_for_select(investment_tags_select_options, params[:tag_name]),
                      { prompt: t("admin.budget_investments.index.tags_filter_all"),
                        label: false,
                        class: "js-submit-on-change" } %>