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app/assets/javascripts/user/app/controllers/table_controller.js.coffee

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+App.TableController = Ember.ObjectController.extend
+  join_request_sent: false
+  tableCanTakeOrders: (->
+    return false unless @get('supplier.can_take_orders')
+    list = @get('controllers.application.list')
+    if list
+      return false unless list.get('supplier.id') == @get('supplier.id')
+      return false unless list.get('table.id') == @get('model.id')
+      true
+    else
+      # no list and open supplier
+      if @get('model.occupied') then false else true
+  ).property('controllers.application.list.id', 'supplier.can_take_orders', 'model.occupied', 'model.id', 'controllers.application.list.table.id')
+  showJoinButton: (->
+    return false unless @get('supplier.can_take_orders')
+    return false if @get('controllers.application.list') # if you already have an active list, do not join another
+    if @get('model.occupied') then true else false
+  ).property('controllers.application.list.id', 'supplier.can_take_orders', 'model.occupied', 'model.id', 'controllers.application.list.table.id')
+  actions:
+    addProduct: (product)->
+      if existing = @store.all('product_order').find((po)-> po.get('product') == product and not po.get('order'))
+        existing.increment()
+      else
+        @store.createRecord 'product_order', product: product
+    joinOccupiedTable: ->
+      #@secured =>
+      $.post('/user/join_occupied_table.json', table_id: @get('model.id'))
+      @set 'join_request_sent', true