How to check multiple conditions in a loop using Data Weave 1

Question

**I have below sample payload, where I need below conditions to meet and get the same payload back using DW 1.0

If isOwned = true for productId = 1003 Then show newPrice = null and hasSpecialPrice = false for 1004,1002,1001,1000

If isOwned = true for productId = 1004 Then show newPrice = null and hasSpecialPrice = false for 1002,1001,1000

If isOwned = true for productId = 1002 Then show newPrice = null and hasSpecialPrice = false for 1001,1000

**

{
   "products":[
      {
         "flavors":[
            {
               "features":null,
               "entitlement":{
                  "isOwned":false
               },
               "locale":"en_US",
               "price":"0.00",
               "newPrice":null,
               "hasSpecialPrice":false,
               "productId":"1000"
            }
         ],
         "id":"1000",
         "enabled":null
      },
      {
         "flavors":[
            {
               "features":null,
               "entitlement":{
                  "isOwned":false
               },
               "locale":"en_US",
               "price":"6.99",
               "newPrice":null,
               "hasSpecialPrice":false,
               "productId":"1001"
            }
         ],
         "id":"1001",
         "enabled":null
      },
      {
         "flavors":[
            {
               "features":null,
               "entitlement":{
                  "isOwned":false
               },
               "locale":"en_US",
               "price":"5.99",
               "newPrice":null,
               "hasSpecialPrice":false,
               "productId":"1002"
            }
         ],
         "id":"1002",
         "enabled":null
      },
      {
         "flavors":[
            {
               "features":null,
               "entitlement":{
                  "isOwned":true
               },
               "locale":"en_US",
               "price":"3.99",
               "newPrice":null,
               "hasSpecialPrice":false,
               "productId":"1003"
            }
         ],
         "id":"1003",
         "enabled":null
      },
      {
         "flavors":[
            {
               "features":null,
               "entitlement":{
                  "isOwned":false
               },
               "locale":"en_US",
               "price":"2.99",
               "newPrice":"1.99",
               "hasSpecialPrice":true,
               "productId":"1004"
            }
         ],
         "id":"1004",
         "enabled":null
      }
   ]
}

Expected Output for condition isOwned = true for productId = 1003 Then show values newPrice = null and hasSpecialPrice = false for 1004,1002,1001,1000:

{
   "products":[
      {
         "flavors":[
            {
               "features":null,
               "entitlement":{
                  "isOwned":false
               },
               "locale":"en_US",
               "price":"0.00",
               "newPrice":null,
               "hasSpecialPrice":false,
               "productId":"1000"
            }
         ],
         "id":"1000",
         "enabled":null
      },
      {
         "flavors":[
            {
               "features":null,
               "entitlement":{
                  "isOwned":false
               },
               "locale":"en_US",
               "price":"6.99",
               "newPrice":null,
               "hasSpecialPrice":false,
               "productId":"1001"
            }
         ],
         "id":"1001",
         "enabled":null
      },
      {
         "flavors":[
            {
               "features":null,
               "entitlement":{
                  "isOwned":false
               },
               "locale":"en_US",
               "price":"5.99",
               "newPrice":null,
               "hasSpecialPrice":false,
               "productId":"1002"
            }
         ],
         "id":"1002",
         "enabled":null
      },
      {
         "flavors":[
            {
               "features":null,
               "entitlement":{
                  "isOwned":true
               },
               "locale":"en_US",
               "price":"3.99",
               "newPrice":null,
               "hasSpecialPrice":false,
               "productId":"1003"
            }
         ],
         "id":"1003",
         "enabled":null
      },
      {
         "flavors":[
            {
               "features":null,
               "entitlement":{
                  "isOwned":false
               },
               "locale":"en_US",
               "price":"2.99",
               "newPrice":null,
               "hasSpecialPrice":false,
               "productId":"1004"
            }
         ],
         "id":"1004",
         "enabled":null
      }
   ]
}

Answer 1

In DataWeave 1.0 you can use when/otherwise for simple conditions and pattern matching with match for more complex ones. To avoid putting too much logic in the main map, I created a variable that returns which of the rules is triggered and a function that updates each element. The object updateWhich is for identifying which elements needs to be updated based on the id triggered.

%dw 1.0
%output application/json

%var updateWhich={
    "1002": ["1000", "1001"],
    "1003": ["1000", "1001", "1002", "1004"],
    "1004": ["1000", "1001", "1002"]
}
%var updateId=(payload.products map ( $ match {
    o when o.id == "1002" and o.flavors.entitlement.isOwned[0] -> "1002",
    o when o.id == "1003" and o.flavors.entitlement.isOwned[0] -> "1003",
    o when o.id == "1004" and o.flavors.entitlement.isOwned[0] -> "1004",
    default -> null    
  }) filter ( $ != null ))[0]  

%function updateProduct(o) o - "flavors" ++ {flavors: [o.flavors[0] - "newPrice" - "hasSpecialPrice" ++ {newPrice: null, hasSpecialPrice: false} ]}
---
products: payload.products map ( updateProduct($) when (updateWhich[updateId] != null) otherwise $)