Typo腳本：重寫多次

Question

我有3幅影像（內容對象）：

tempProjectImage = IMAGE                 
       tempProjectImage { 
        file{ 
         #Nur der erste Eintrag. 
         import.listNum = 0 

         #Datei wird aus DAM gelesen 
         import.cObject = USER        
         import.cObject { 
          userFunc = tx_dam_tsfe->fetchFileList 
          refField = project_picture 
          refTable = tx_nmshowroom_items 
         }        
         width = 298 
         height = 200        
        } 

        altText.field = title 
        titleText.field = title 
        params = class="previewImage"                          
       } 

tempItemImage = IMAGE                 
       tempItemImage { 
        file{ 
         #Nur der erste Eintrag. 
         import.listNum = 0 

         #Datei wird aus DAM gelesen 
         import.cObject = USER        
         import.cObject { 
          userFunc = tx_dam_tsfe->fetchFileList 
          refField = images 
          refTable = tx_nmshowroom_items 
         }        
         width = 298 
         height = 200        
        } 

        altText.field = title 
        titleText.field = title 
        params = class="previewImage"                          
       } 

custImage = IMAGE 
        custImage { 
         file{ 
          #Nur der erste Eintrag. 
          import.listNum = 0 

          #Datei wird aus DAM gelesen 
          import.cObject = USER        
          import.cObject = USER        
          import.cObject { 
           userFunc = tx_dam_tsfe->fetchFileList 
           refField = images 
           refTable = tx_nmshowroom_customers 
           refUid.field = tx_nmshowroom_customers 
          }       
          width = 298 
          height = 200        
         } 

         altText.field = title 
         titleText.field = title 
         params = class="previewImage"                          
        } 

在我的HTML模板我有

###IMAGE### 

我想要做的是一種多重覆蓋的：

如果tempItemImage爲空，則顯示tempProjectImage，如果tempProjectImage也爲空，則顯示custImage。

我開始：

image < .customers.custImage 
image.file.import.override.cObject < .tempProjectImage.file.import.cObject 

這完美的作品。但是當我添加另一個覆蓋：

image < .customers.custImage 
image.file.import.override.cObject < .tempProjectImage.file.import.cObject 
image.file.import.override.cObject < .tempItemImage.file.import.cObject 

它不工作了。 tempItemImage（如果存在）不會覆蓋其他圖像。

我在做什麼錯？

由於提前， 達維德

Answer 1

有一個stdWrap功能「ifEmpty」，我想這適合於你想要做什麼。

（未經測試）

# you need only one IMAGE object, 
# but you add an ifEmpty statement, two times with 
# the fall back USER-Object 
tempProjectImage = IMAGE                 
tempProjectImage { 
    file{ 
    import.listNum = 0 
    import.cObject = USER        
    import.cObject { 
     # default 
    } 
    import.ifEmpty.cObject = USER 
    import.ifEmpty.cObject { 
     # Fallback 
    } 
    import.ifEmpty.ifEmpty.cObject = USER 
    import.ifEmpty.ifEmpty.cObject { 
     # second fallback 
    } 
    } 
}