How to insert data into a custom object with lookup field from apex controller

Question

I have a custom object MyCustomObj__c which has a field called "ContactData".

I am trying to insert a record into the custom object with the following apex method. It gives an error:

Invalid ID

The value Hari already exists in the Contact list.

apex code:

public static String saveData(){

    MyCustomObj__c newObj = new MyCustomObj__c(); 

    newObj.contactData__c = 'Hari';

    insert newObj;

    return "success";

}

How do I insert a row?

Answer 1

Pass ID of contact record 'Hari'.

public static String saveData(){

       MyCustomObj__c newObj = new MyCustomObj__c(); 

       newObj.contactData__c = [SELECT Id 

                                FROM Contact 

                                WHERE Name ='Hari' LIMIT 1].Id;

       insert newObj;

       return "success";

 }

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