Move #manages_one_enterprise? from User model to Permissions

app/controllers/spree/admin/overview_controller_decorator.rb

@@ -5,7 +5,7 @@ Spree::Admin::OverviewController.class_eval do
     @product_count = Spree::Product.active.managed_by(spree_current_user).count
     @order_cycle_count = OrderCycle.active.managed_by(spree_current_user).count
 
-    if spree_current_user.manages_one_enterprise?
+    if OpenFoodNetwork::Permissions.new(spree_current_user).manages_one_enterprise?
       @enterprise = @enterprises.first
       if @enterprise.sells == "unspecified"
         render "welcome", layout: "spree/layouts/bare_admin"

app/models/spree/user_decorator.rb

@@ -19,10 +19,6 @@ Spree.user_class.class_eval do
     end
   end
 
-  def manages_one_enterprise?
-    enterprises.length == 1
-  end
-
   def send_signup_confirmation
     Spree::UserMailer.signup_confirmation(self).deliver
   end

lib/open_food_network/permissions.rb

@@ -25,6 +25,10 @@ module OpenFoodNetwork
       managed_and_related_enterprises_with :manage_products
     end
 
+    def manages_one_enterprise?
+      @user.enterprises.length == 1
+    end
+
 
     private