[SalesForce] Deserialize Json String into from Map> in apex

I am currently working on a Lightning component where the data that I am passing from my apex controller ( in the doInit() ) is in the form of Map<String,List<CustomWrapper>>.

When Some modifications to the records are made, I have to pass this whole Map from component to apex controller.

To achieve this, I have first converted this map into Json using stringify() in my JS Controller and then passed this string version of json to my apex method.

Now, when I receive this string in the apex method, I am unable to convert it back in the form of Map<String,List<CustomWrapper>>.

How do I do this?

P.S. – CustomWrapper is a wrapper class with some string variables in it.

Best Answer

You can use JSON.deserialize in you apex Class. Hope this example will help you.

Apex controller

@AuraEnabled
public static void onInit(String memberJson){
  Map<String,List<CustomWrapper>> myMap = 
  (Map<String,List<CustomWrapper>>)JSON.deserialize(memberJson, 
  Map<String,List<CustomWrapper>>.class);
}

Related Solutions

[SalesForce] System.JSONException: Malformed JSON: Expected ‘[‘ at the beginning of List/Set when deserializing JSON object in apex

JSON arrays are simply written as '[ "Item1", "Item2", "Item3" ]'.

As for generating the correct array, you should be using JavaScript built-ins, instead of trying to write your own JSON by hand:

var inputs = [];
inputs.push("String 'One'")
inputs.push("String 'Two'")
inputs.push("String 'Three'")
document.getElementById('{!$Component.pageId.form.hiddenfield}').value = JSON.stringify(inputs);

[SalesForce] JSON String to custom object list

You're trying to insert an array, not a single record, from your JSON, but in your Apex Code, you're trying to deserialize just a single question. Instead, you can do this:

Question__c[] records = (Question__c[])JSON.deserialize(questionData, List<Question__c>.class);

Also, using remote action methods, you can SObjects in directly:

@RemoteAction public static String insertQuestions(Question__c[] questionData) {

This skips the bit about having to deserialize it manually, but you can't catch those errors in Apex Code either, if you use this technique. It also might require some small change to your JavaScript to include an "attributes" parameter (deserialize a standard SObject to see what I'm talking about).

Best Answer

Related Solutions

[SalesForce] System.JSONException: Malformed JSON: Expected ‘[‘ at the beginning of List/Set when deserializing JSON object in apex

[SalesForce] JSON String to custom object list

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