How to copy field data from object to object with a button-click via Apex?

Question

I want to copy field data from one object to another with a click on a button. I want to get a snapshot of the current family status and copy the data from related son and father data.

I have an custom object son with the following fields: s_name, s_street and father, where father is a lookup to object father, which has the fields f_name and f_age.

I want to have a button on the son page, saying new family, which populates another custom object family with the respective fields from the originating objects: s_name, s_street etc.

How would I realize such a copy action via Apex?

Answer 1

If you want on a button call go for custom button with apex behind it doing job of creation and populating the data.

If you want that as soon as a new Son record and automatic family record is created and populated go for trigger,

//apex method pseudo code

public pagerefrence createfamilyrecord(){

 Id recordId = System.currentPagereference().getParameters().get('Id');

 List<Son__c> lstson=[Select Id ,s_name, s_street from Son__c where id =:recordId];

 if(lstson__c.size()>0){

   Family__c fam=new Family__c();

   fam.field1=lstson.get(0).s_name;

    fam.field2=lstson.get(0).s_street;

    insert faml;

    return null;//Return where you want the navigation to be 
    }

   }

//Visualforce pseudo code

<apex:commandButton action="{!createfamilyrecord}" value="NEw Family" id="theButton"/>