Apex Generate JSON Dynamically

Question

I'm facing an issue when generating a JSON dynamically.I've created different inner class to represent the JSON:

public class OrderActions {

    public OrderActions(String type, Object addproduct, Object removeProduct) {

        SM003_Order.TriggerDate triggerdateCE = new SM003_Order.TriggerDate('ContractEffective');
        SM003_Order.TriggerDate triggerdateSA = new SM003_Order.TriggerDate('ServiceActivation');
        SM003_Order.TriggerDate triggerdateCA = new SM003_Order.TriggerDate('CustomerAcceptance');

        List<SM003_Order.TriggerDate> triggerDates = new List<SM003_Order.TriggerDate> ();
        triggerDates.add(triggerdateCA);
        triggerDates.add(triggerdateCE);
        triggerDates.add(triggerdateSA);

        this.triggerDates = triggerDates;
        this.type = type;

        //it's either add or remove, can't be both
        if (addproduct != null) {
            this.Action = addproduct;
        }
        if (removeProduct != null) {
            this.Action = removeProduct;
        }
    }

    public List<TriggerDate> triggerDates { get; set; }
    public String type { get; set; }
    public Object Action { get; set; }
}

Depending on if i want to add a product or remove a product the Action Object can be instantiated in two differents types: Add Product:

public class AddProduct {

    public AddProduct() {
    }

    public AddProduct(String productRatePlanId, List<ChargeOverrides> chargeOverrides) {
        this.chargeOverrides = chargeOverrides;
        this.productRatePlanId = productRatePlanId;
    }

    public String productRatePlanId { get; set; }
    public List<ChargeOverrides> chargeOverrides { get; set; }
}

or Remove Product:

public class RemoveProduct {

    public RemoveProduct(String ratePlanId) {
        this.ratePlanId = ratePlanId;
    }

    public String ratePlanId { get; set; }
}

The problem is that when i serialize the the whole object the JSON is generated like this (add product):

"orderActions": [
    {
      "type": "AddProduct",
      "triggerDates": [
        {
          "name": "ContractEffective",
          "triggerDate": "2020-03-27"
        },
        {
          "name": "ServiceActivation",
          "triggerDate": "2020-03-27"
        },
        {
          "name": "CustomerAcceptance",
          "triggerDate": "2020-03-27"
        }
      ],
      "Action": {
        "productRatePlanId": "8adc9dee710b7521017116c56aa95670",
        "chargeOverrides": [
          {
            "productRatePlanChargeId": "8adc8f99710b7523017116c5cae87a13",
            "pricing": {
              "recurringFlatFee": {
                "listPrice": 17
              }
            }
          }
        ]
      }
    }
  ]

or like this (Remove product):

"orderActions": [
    {
      "type": "RemoveProduct",
      "triggerDates": [
        {
          "name": "ContractEffective",
          "triggerDate": "2020-03-25"
        },
        {
          "name": "ServiceActivation",
          "triggerDate": "2020-03-25"
        },
        {
          "name": "CustomerAcceptance",
          "triggerDate": "2020-03-25"
        }
      ],
      "Action": {
        "ratePlanId": "8adce4216b9de86d016bb3c15fbb0a2f"
      }
    }
  ]

Which is fine except for The key "action" that has to be named either 'addProduct' or 'removeProduct' to respect a specific format. But because of my generic constructor it doesn't generate the good value for this key... Do you guys know how could i change the value of this key?

Cheers!

Answer 1

It's not clear from the code how you are generating the JSON dynamically. Here is a sample code that might help.

OrderAction

public class OrderAction {
    public String type;        
    public Action Action;
    public List<TriggerDate> triggerDates = new List<TriggerDate>();

    // CONSTRUCTOR

    public OrderAction(String type) {
        this.type = type;
    }


    public OrderAction add(TriggerDate triggerDate) {
        this.triggerDates.add(triggerDate);

        return this;
    }


    public OrderAction setAction(Action action) {
        this.Action = action;

        return this;
    }


    public class Action {
        public String productRatePlanId;
        public String ratePlanId;

        public List<ChargeOverride> chargeOverrides = new List<ChargeOverride>();

        public Action add(ChargeOverride chargeOverride) {
            this.chargeOverrides.add(chargeOverride);

            return this;
        }


        public Action setProductRatePlanId(String productRatePlanId) {
            this.productRatePlanId = productRatePlanId;

            return this;
        }


        public Action setRatePlanId(String ratePlanId) {
            this.ratePlanId = ratePlanId;

            return this;
        }
    }


    public class TriggerDate {
        public String name;
        public String triggerDate;

        public TriggerDate(String name, String triggerDate) {
            this.name = name;
            this.triggerDate = triggerDate;
        }
    }


    public class ChargeOverride {
        public String productRatePlanChargeId;
        public Pricing pricing;

        public ChargeOverride(String productRatePlanChargeId) {
            this.productRatePlanChargeId = productRatePlanChargeId;
        }


        public ChargeOverride setPricing(Pricing pricing) {
            this.pricing = pricing;

            return this;
        }
    }


    public class Pricing {
        public RecurringFlatFee recurringFlatFee;

        public Pricing(RecurringFlatFee recurringFlatFee) {
            this.recurringFlatFee = recurringFlatFee;
        }            
    }


    public class RecurringFlatFee {
        public Decimal listPrice;

        public RecurringFlatFee(Decimal listPrice) {
            this.listPrice = listPrice;
        }
    }
}

GenericConstructor

public class GenericConstructor {
    public OrderAction getAddProduct() {
        return new OrderAction('AddProduct')
            .add( new OrderAction.TriggerDate('ContractEffective', '2020-03-27'))
            .add( new OrderAction.TriggerDate('ServiceActivation', '2020-03-27'))
            .add( new OrderAction.TriggerDate('CustomerAcceptance', '2020-03-27'))
            .setAction( new OrderAction.Action()
                            .setProductRatePlanId('8adc9dee710b7521017116c56aa95670')
                            .add( new OrderAction.ChargeOverride('8adc8f99710b7523017116c5cae87a13')
                                     .setPricing( new OrderAction.Pricing( new OrderAction.RecurringFlatFee(17)))));
    }


    public OrderAction getRemoveProduct() {
        return new OrderAction('RemoveProduct')
            .add( new OrderAction.TriggerDate('ContractEffective', '2020-03-27'))
            .add( new OrderAction.TriggerDate('ServiceActivation', '2020-03-27'))
            .add( new OrderAction.TriggerDate('CustomerAcceptance', '2020-03-27'))
            .setAction( new OrderAction.Action()
                            .setRatePlanId('8adce4216b9de86d016bb3c15fbb0a2f'));
    }
}