diff --git a/app/controllers/admin/budget_investments_controller.rb b/app/controllers/admin/budget_investments_controller.rb
index 569cc0c57..b83189ccd 100644
--- a/app/controllers/admin/budget_investments_controller.rb
+++ b/app/controllers/admin/budget_investments_controller.rb
@@ -39,7 +39,7 @@ class Admin::BudgetInvestmentsController < Admin::BaseController
     if @investment.update(budget_investment_params)
       redirect_to admin_budget_budget_investment_path(@budget,
                                                       @investment,
-                                                      Budget::Investment.filter_params(params)),
+                                                      Budget::Investment.filter_params(params).to_h),
                   notice: t("flash.actions.update.budget_investment")
     else
       load_admins
diff --git a/app/controllers/valuation/budget_investments_controller.rb b/app/controllers/valuation/budget_investments_controller.rb
index 2ee531f27..5562280c2 100644
--- a/app/controllers/valuation/budget_investments_controller.rb
+++ b/app/controllers/valuation/budget_investments_controller.rb
@@ -97,8 +97,8 @@ class Valuation::BudgetInvestmentsController < Valuation::BaseController
     end
 
     def params_for_current_valuator
-      Budget::Investment.filter_params(params).merge(valuator_id: current_user.valuator.id,
-                                                     budget_id: @budget.id)
+      Budget::Investment.filter_params(params).to_h.merge({ valuator_id: current_user.valuator.id,
+                                                            budget_id: @budget.id })
     end
 
     def valuation_params
diff --git a/app/views/admin/budget_investments/_select_investment.html.erb b/app/views/admin/budget_investments/_select_investment.html.erb
index e4c7f5355..040d128e1 100644
--- a/app/views/admin/budget_investments/_select_investment.html.erb
+++ b/app/views/admin/budget_investments/_select_investment.html.erb
@@ -5,7 +5,7 @@
   <%= link_to investment.title,
               admin_budget_budget_investment_path(budget_id: @budget.id,
                                                   id: investment.id,
-                                                  params: Budget::Investment.filter_params(params)),
+                                                  params: Budget::Investment.filter_params(params).to_h),
               target: "_blank" %>
 </td>
 <td class="text-center">
diff --git a/app/views/admin/budget_investments/edit.html.erb b/app/views/admin/budget_investments/edit.html.erb
index 6cfcfbe63..a9c81dd39 100644
--- a/app/views/admin/budget_investments/edit.html.erb
+++ b/app/views/admin/budget_investments/edit.html.erb
@@ -1,11 +1,11 @@
-<%= link_to admin_budget_budget_investment_path(@budget, @investment, Budget::Investment.filter_params(params)), class: "back" do %>
+<%= link_to admin_budget_budget_investment_path(@budget, @investment, Budget::Investment.filter_params(params).to_h), class: "back" do %>
   <span class="icon-angle-left"></span> <%= t("shared.back") %>
 <% end %>
 
 <%= form_for @investment,
              url: admin_budget_budget_investment_path(@budget, @investment) do |f| %>
 
-  <% Budget::Investment.filter_params(params).each do |filter_name, filter_value| %>
+  <% Budget::Investment.filter_params(params).to_h.each do |filter_name, filter_value| %>
    <%= hidden_field_tag filter_name, filter_value %>
   <% end %>
 
diff --git a/app/views/admin/budget_investments/show.html.erb b/app/views/admin/budget_investments/show.html.erb
index 191b498ef..d364118ca 100644
--- a/app/views/admin/budget_investments/show.html.erb
+++ b/app/views/admin/budget_investments/show.html.erb
@@ -1,4 +1,4 @@
-<%= link_to admin_budget_budget_investments_path(Budget::Investment.filter_params(params)),
+<%= link_to admin_budget_budget_investments_path(Budget::Investment.filter_params(params).to_h),
             class: "back", data: {no_turbolink: true} do %>
   <span class="icon-angle-left"></span><%= t("shared.back") %>
 <% end %>
@@ -7,7 +7,7 @@
 
 <%= link_to t("admin.budget_investments.show.edit"),
             edit_admin_budget_budget_investment_path(@budget, @investment,
-                                                Budget::Investment.filter_params(params)) unless @budget.finished? %>
+                                                Budget::Investment.filter_params(params).to_h) unless @budget.finished? %>
 
 <hr>
 
@@ -44,7 +44,7 @@
 <p>
   <%= link_to t("admin.budget_investments.show.edit_classification"),
                 edit_admin_budget_budget_investment_path(@budget, @investment,
-                                                  {anchor: "classification"}.merge(Budget::Investment.filter_params(params))) unless @budget.finished? %>
+                                                  {anchor: "classification"}.merge(Budget::Investment.filter_params(params).to_h)) unless @budget.finished? %>
 </p>
 
 <hr>
diff --git a/spec/controllers/concerns/has_orders_spec.rb b/spec/controllers/concerns/has_orders_spec.rb
index 4a6f66299..a14346802 100644
--- a/spec/controllers/concerns/has_orders_spec.rb
+++ b/spec/controllers/concerns/has_orders_spec.rb
@@ -14,7 +14,7 @@ describe HasOrders do
     end
 
     def new
-      render text: "#{@current_order} (#{@valid_orders.join(" ")})"
+      render plain: "#{@current_order} (#{@valid_orders.join(" ")})"
     end
   end