Show receive button in grey when already received

app/helpers/orders_helper.rb

@@ -139,4 +139,18 @@ module OrdersHelper
       'unavailable'
     end
   end
+
+  # Button for receiving an order.
+  #   If the order hasn't been received before, the button is shown in green.
+  # @param order [Order]
+  # @option options [String] :class Classes added to the button's class attribute.
+  # @return [String] Order receive button.
+  def receive_button(order, options={})
+    if order.stockit?
+      content_tag :div, t('orders.index.action_receive'), class: "btn disabled #{options[:class]}"
+    else
+      was_received = order.order_articles.where('units_received IS NOT NULL').any?
+      link_to t('orders.index.action_receive'), receive_order_path(order), class: "btn#{' btn-success' unless was_received} #{options[:class]}"
+    end
+  end
 end

app/views/orders/index.html.haml

@@ -54,8 +54,7 @@
               %td= truncate(order.note)
               %td
                 - unless order.stockit?
-                  -# TODO btn-success class only if not received before
-                  = link_to t('.action_receive'), receive_order_path(order), class: 'btn btn-small btn-success'
+                  = receive_button order
 
               %td
                 = link_to t('ui.copy'), new_order_path(order_id: order, supplier_id: order.supplier), class: 'btn btn-small'

app/views/orders/show.html.haml

@@ -64,8 +64,7 @@
         data: {confirm: t('.confirm_end', order: @order.name)}
       = link_to t('ui.edit'), edit_order_path(@order), class: 'btn'
     - elsif not @order.closed? and not @order.stockit?
-      -# TODO btn-success class only if not received before
-      = link_to t('orders.index.action_receive'), receive_order_path(@order), class: 'btn btn-success'
+      = receive_button @order
     - unless @order.closed?
       = link_to t('ui.delete'), @order, data: {confirm: t('.confirm_delete')}, method: :delete,
         class: 'btn btn-danger'