將鏈接的數據源添加到查詢時，Group-by失敗

Question

我有以下代碼，它在Req Trans表上構建查詢以顯示按項目/網站統一的數量;

query = new Query(); 
dsReqTrans = query.addDataSource(tablenum(ReqTrans)); 

dsReqTrans.addRange(fieldnum(ReqTrans, ReqPlanId)).value(_reqPlanId); 
dsReqTrans.addRange(fieldnum(ReqTrans, RefType)).value(enum2str(_reqRefType)); 

dsReqTrans.addGroupByField(fieldnum(ReqTrans, ItemId)); 
dsReqTrans.addSelectionField(fieldnum(ReqTrans, Qty), SelectionField::Sum); 

dsInventDim = dsReqTrans.addDataSource(tablenum(InventDim)); 
dsInventDim.joinMode(JoinMode::InnerJoin); 
dsInventDim.relations(false); 
dsInventDim.addLink(fieldnum(ReqTrans, CovInventDimId), fieldnum(InventDim, InventDimId)); 

dsInventDim.addGroupByField(fieldnum(InventDim, InventSizeId)); 
dsInventDim.addGroupByField(fieldnum(InventDim, InventSiteId)); 

rangeInventSiteId = dsInventDim.addRange(fieldnum(InventDim, InventSiteId)); 
rangeInventSiteId.value(_parmSiteId); 

這很有效。我按項目/網站獲得數量列的總和。

但是，如果我還想在ItemGroupId上添加範圍。爲此，我需要像這樣鏈接到InventTable;

dsInventTable = dsReqTrans.addDataSource(tablenum(InventTable)); 
dsInventTable.joinMode(JoinMode::InnerJoin); 
dsInventTable.relations(false); 
dsInventTable.addLink(fieldnum(ReqTrans, ItemId), fieldnum(InventTable, ItemId)); 

dsInventTable.addRange(fieldnum(InventTable, ItemGroupId)).value(_parmItemGroupId); 

當我添加此數據源時，InventDim的鏈接已損壞。我只收到按項目分組的所有站點的所有項目數量的總和，而不是按項目/站點分組。

這是爲什麼？

Answer 1

基本上你不能有兩個內部連接到同一個數據源（你可以，但它不會工作）。

如果使用AX 2012可以將InventTable數據源添加到InventDim代替：

dsInventTable = dsInventDim.addDataSource(tablenum(InventTable)); 
dsInventTable.joinMode(JoinMode::ExistsJoin); 
dsInventTable.relations(false); 
// OBS 3 arguments next: 
dsInventTable.addLink(fieldnum(ReqTrans, ItemId), fieldnum(InventTable, ItemId), dsReqTrans.name()); 
dsInventTable.addRange(fieldnum(InventTable, ItemGroupId)).value(_parmItemGroupId); 

在早期版本中，你把InventTable第一（從InventTable記住組由一個字段）：

query = new Query(); 
dsInventTable = dsReqTrans.addDataSource(tablenum(InventTable)); 
dsInventTable.addGroupByField(fieldnum(InventTable, ItemId)); // You have to group/sum something 
dsReqTrans = dsInventTable.addDataSource(tablenum(ReqTrans)); 
dsReqTrans.joinMode(JoinMode::InnerJoin); 
dsReqTrans.relations(false); 
dsReqTrans.addLink(fieldnum(InventTable, ItemId).fieldnum(ReqTrans, ItemId)); 
...