How to convert a Json String into List<object> in apex

Question

I need to convert a String into a list<wrapperObject> or a Map<string, object>

The list contains something like that :

[{"FieldName":"AccountId","FieldType":"lookup-Account","ObjectName":"Opportunity","Operator":"=","Value":"0016E00000TIZUYQA5"}]

this list example contains one row.

and the wrapper class is like that :

public class WrapperLine {
    @AuraEnabled
    public String ObjectName;
    @AuraEnabled
    public String FieldName;
    @AuraEnabled
    public String Operator;
    @AuraEnabled
    public String Value;
    @AuraEnabled
    public String FieldType;
}

Answer 1

How about this ?? Sorry to my bad format... first writting..

Public void convert(Object jsonData){
    Wrapper convertedData = (Wrapper)JSON.deserialize(JSON.serialize(jsonData),Wrapper.Class);

 String objectName   = convertedData.getObjectName();
  (do something....)
}

Class Wrapper{
    String objectName;
    String fieldName;
    ( some else...)

    String getObjectName(){
        return objectName;
    }
}

Answer 2

As long as your string is valid JSON, you can use your Wrapper class, which follows data model of the JSON, and deserialize into it. Simply use JSON.deserialize(<your_json_string>, <wrapper_class>.class); from JSON Class.

String originalValues = '[{"FieldName":"AccountId","FieldType":"lookup-Account","ObjectName":"Opportunity","Operator":"=","Value":"0016E00000TIZUYQA5"}]';

List<WrapperLine> wrapperLines = (List<WrapperLine>)JSON.deserialize(value, List<WrapperLine>.class);

Answer 3

I replicated your scenario, Below code gives the required result:

public class manageFiltersDELETE {

public static WrapperLine manageFilters(Map<String, String> lines){
   // System.debug('##--Lines:  '+JSON.deserializeUntyped(lines.get('1')));
     List<Object> reqBody = (List<Object>)JSON.deserializeUntyped(lines.get('1'));
    manageFiltersDELETE manageFiltersDELobj = new manageFiltersDELETE();
    WrapperLine wrapObj  = new WrapperLine((Map<String, Object>)reqBody[0]);
    System.debug('##--wrapObj:  '+wrapObj);
    return wrapObj;


}

public class WrapperLine {
    @AuraEnabled
    public String ObjectName;
    @AuraEnabled
    public String FieldName;
    @AuraEnabled
    public String Operator;
    @AuraEnabled
    public String Value;
    @AuraEnabled
    public String FieldType;

    public WrapperLine(Map<String, Object> lines){
        ObjectName = (String)lines.get('ObjectName');
        FieldName = (String)lines.get('FieldName');
        Operator = (String)lines.get('Operator');
        Value = (String)lines.get('Value');
        FieldType = (String)lines.get('FieldType');

    }
}}

and call above class method like below:

 Map<String, String> mapFilters = new Map<String, String>();

    String filter = '[{"FieldName":"AccountId","FieldType":"lookup-Account","ObjectName":"Opportunity","Operator":"=","Value":"0016E00000TIZUYQA5"}]';

    mapFilters.put('1', filter);

    manageFiltersDELETE.WrapperLine returnBody = manageFiltersDELETE.manageFilters(mapFilters);