How to edit nested objects in Appian Script task in process

Question

Hi, 
 I have a data like 
 {
 'type!{urn:com:appian:types:CB}CB_Builder_Checklist_And_Items'(
 'checklist': 'type!{urn:com:appian:types:CB}CB_Builder_Checklist'(
 'id': 32,
 'name': "Test",
 'description': "Test",
 'owner': "",
 'use_group_additional_owners': false
 ),
 'checklistItems': {
 'type!{urn:com:appian:types:CB}CB_Builder_C_Item'(
 'id': 47,
 'name': "Test1",
 'item_type_id': 6,
 'isInterval': false,
 'validate_answer': false,
 'owner': "",
 'use_group_additional_owners': false,
 'choice_multiple': false,
 'mandatory_comment_fail': false,
 'description': "Test"
 )
 }
 ),
 'type!{urn:com:appian:types:CB}CB_Builder_Checklist_And_Items'(
 'checklist': 'type!{urn:com:appian:types:CB}CB_Builder_Checklist'(
 'id': 47,
 'name': "Test",
 'description': "Test",
 'owner': "",
 'use_group_additional_owners': false
 ),
 'checklistItems': {
 'type!{urn:com:appian:types:CB}CB_Builder_C_Item'(
 'id': 72,
 'name': "Test1",
 'item_type_id': 8,
 'isInterval': false,
 'validate_answer': false,
 'owner': "",
 'use_group_additional_owners': false,
 'choice_multiple': false,
 'mandatory_comment_fail': false,
 'description': "Test"
 )
 }
 )
} 
 
 now I have to assign all the ids to null value in a script task in process model. How to do that? I have tried: a!forEach(
 items: pv!ChecklistsAndItems,
 expression: {
 fv!item.checkist.id:1,
 a!update(data:fv!item.checklistItems, index:"id", value: 1)
 }
) 
 It not worked for me. How to achieve this?

Stefan Helzle · Answer

Sowvik Roy said: It not worked for me 
 ??? What output do you observe? 
 
 ... a few moments later ... a tiny working example 
 a!localVariables(
 local!data: {
 {
 id: 1,
 items: {
 {id: 2},
 {id: 3},
 }
 },
 {
 id: 4,
 items: {
 {id: 5},
 {id: 6},
 }
 },
 },
 a!forEach(
 items: local!data,
 expression: a!update(
 /* Pass the updated data with a new ID */
 data: a!update(
 data: fv!item,
 index: "id",
 value: fv!index + 5
 ),
 /* Then the econd update comes here */
 index: "items",
 value: a!forEach(
 items: fv!item.items,
 expression: a!update(
 data: fv!item,
 index: "id",
 value: fv!index + 6
 )
 )
 )
 )
)

Shanmathi Ponnusamy · Answer

Sowvik Roy Please try the below code. 
 a!localVariables(
 local!testData: {
 'type!{urn:com:appian:types:SS}SS_TEST'(
 testId: 1,
 fieldOne: "testValue1",
 fieldTwo: "testValue2",
 accountHolderDetails: 'type!{urn:com:appian:types:SS}SS_Account_Holder'(
 id: 4,
 firstName: "John",
 email: "sample@test.com"
 ),
 creditCardDetails: {
 'type!{urn:com:appian:types:SS}SS_Credit_Card'(
 creditCardId: 20,
 cardHolderId: 1323,
 lastFourDigits: "8962",
 creditLimit: "100000"
 ),
 'type!{urn:com:appian:types:SS}SS_Credit_Card'(
 creditCardId: 28,
 cardHolderId: 1323,
 lastFourDigits: "8972",
 creditLimit: "100000"
 )
 }
 ),
 'type!{urn:com:appian:types:SS}SS_TEST'(
 testId: 2,
 fieldOne: "testValue1",
 fieldTwo: "testValue2",
 accountHolderDetails: 'type!{urn:com:appian:types:SS}SS_Account_Holder'(
 id: 22,
 firstName: "Daniel",
 email: "sample23@test.com"
 ),
 creditCardDetails: {
 'type!{urn:com:appian:types:SS}SS_Credit_Card'(
 creditCardId: 100,
 cardHolderId: 1800,
 lastFourDigits: "8962",
 creditLimit: "100000"
 ),
 'type!{urn:com:appian:types:SS}SS_Credit_Card'(
 creditCardId: 200,
 cardHolderId: 1800,
 lastFourDigits: "8972",
 creditLimit: "100000"
 )
 }
 )
 },
 a!forEach(
 items: local!testData,
 expression: a!localVariables(
 local!accountHolderDetailsUpdated: a!update(
 data: fv!item.accountHolderDetails,
 index: "id",
 value: null
 ),
 local!creditCardUpdated: a!update(
 data: fv!item.creditCardDetails,
 index: "creditCardId",
 value: null
 ),
 'type!{urn:com:appian:types:SS}SS_TEST'(
 testId: fv!item.testId,
 fieldOne: fv!item.fieldOne,
 fieldTwo: fv!item.fieldTwo,
 accountHolderDetails: local!accountHolderDetailsUpdated,
 creditCardDetails: local!creditCardUpdated
 )
 )
 )
)