Hello everyone,I am trying to use expandcdt() function

Hi,

The expandcdt smart service function documentation is misleading. It is not documented well.

Here's an example of how you can use this function:

load(

 local!topicCdt:  {

                     {id: 1, topic: "SimpleTopic1", subTopicList: {"item1", "item2", "item3"}},

                     {id: 2, topic: "SimpleTopic2", subTopicList: {"item4", "item5", "item6"}}

                  },

   expandcdt(

   cdt: local!topicCdt,

   expandField: "subTopicList"

 )

)

And the output would be :

List of Dictionary: 6 items Dictionary

id: 1 topic: "SimpleTopic1" subTopicList: "item1"

Dictionary

id: 1 topic: "SimpleTopic1" subTopicList: "item2"

Dictionary

id: 1 topic: "SimpleTopic1" subTopicList: "item3"

Dictionary

id: 2 topic: "SimpleTopic2" subTopicList: "item4"

Dictionary

id: 2 topic: "SimpleTopic2" subTopicList: "item5"

Dictionary

id: 2 topic: "SimpleTopic2" subTopicList: "item6"

Hope this answers your question. Good luck!

Regards,

Sunil Zacharia

Hi Sunil,

If given in your mentioned format it is working.If i tried taking my cdt as a rule input as below,

expandcdt(
cdt:ri!employee,
expandField:"empGender"
)

I am getting the error-"Expression evaluation error at function 'expandcdt'"

Here's another example with nested cdt's

load(
 local!subCdt: {it1: "item1", it2: "item2", it3: "item3"},
 local!topicCdt: {
                   {id: 1, topic: "SimpleTopic1", subTopicList: {a: local!subCdt, b: local!subCdt, c: local!subCdt}}
                 },
 expandcdt(
  cdt: local!topicCdt,
  expandField: "subTopicList"
 )
)

Output:

List of Dictionary: 1 item Dictionary

id: 1 topic: "SimpleTopic1"

  nest.a: Dictionary

    it1: "item1"

    it2: "item2"

    it3: "item3"

  nest.b: Dictionary

    it1: "item1"

    it2: "item2"

    it3: "item3"

  nest.c: Dictionary

    it1: "item1"

    it2: "item2"

    it3: "item3"

Here's a cheeky solution for your problem. This code will give you list of column names in your cdt that have changed.

It does not work for nested cdt's but you can try to improve on this. Hope it helps.

load(
  local!disectCdt: rule!disectCDT(
                      cdt1: 'type!<cdt>'(a: 1, b: "doc1", c: "desc1"),
                      cdt2: 'type!<cdt>'(a: 1, b: "doc1", c: "")
                   ),
  local!cdtColumns: index(index(local!disectCdt, "cdt1"), "columnArray"),
  local!cdt1Values: index(index(local!disectCdt, "cdt1"), "valueArray"),
  local!cdt2Values: index(index(local!disectCdt, "cdt2"), "valueArray"),
  local!changedColumnIndex: where(
                                a!forEach(
                                local!cdt1Values,
                                fv!item <> local!cdt2Values[fv!index]
                              )
                            ),
  index(local!cdtColumns, local!changedColumnIndex)
)

 And this is your supporting rule rule!disectCDT

if(
  runtimetypeof(ri!cdt1) <> runtimetypeof(ri!cdt2),
  null,
  load(
    local!cdt1ToColVal: split(stripwith(touniformstring(ri!cdt1),"[]"),","),
    local!cdt1Columns: a!forEach(local!cdt1ToColVal, split(fv!item, "=")[1]),
    local!cdt1Values: a!forEach(local!cdt1ToColVal, split(fv!item, "=")[2]),
    
    local!cdt2ToColVal: split(stripwith(touniformstring(ri!cdt2),"[]"),","),
    local!cdt2Columns: a!forEach(local!cdt2ToColVal, split(fv!item, "=")[1]),
    local!cdt2Values: a!forEach(local!cdt2ToColVal, split(fv!item, "=")[2]),
    {
      cdt1: {
        columnArray: local!cdt1Columns,
        valueArray: local!cdt1Values
      },
      cdt2: {
        columnArray: local!cdt2Columns,
        valueArray: local!cdt2Values
      }
    }
  )
)