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Akshay ShrivastavaAkshay Shrivastava 

I want to show number of child object records in parent object field. soo i writed this code ..can any one tell me the code is right or not and also how to execute in anonymous window

public class Processor 
{
  @future
  public static void count(Set<id> setId) 
  {
      List<parent__c> lst = [select id,noOfrecords__c , (select id from childs__r) from parent__c where id in :setId ];
      for( parent__c acc : lst )
      {
          List<child__c> lstCount = acc.childs__r ;
          
          acc.noOfrecords__c = lstCount.size();
      }
      update lst;
  }
}
Best Answer chosen by Akshay Shrivastava
CharuDuttCharuDutt
Hii Akshay Shrivastava
Try The Below Code 
EXAMPLE::
trigger NumberOfChild on Contact (After Insert,After Update,After Delete) {
    List<Account> accList=new List<Account>();
    Set<Id> setAccIds = new Set<Id>();
    if(Trigger.isInsert){
         if(trigger.isAfter){
        for(Contact con : Trigger.new){
            if(con.AccountId != null){
            setAccIds.add(con.AccountId);
                }
            }
        }
    } 
    system.debug('setAccIds ==> '+setAccIds);
    if(Trigger.isUpdate){
         if(trigger.isAfter){
        for(Contact con : Trigger.new){ 
            if(con.AccountId!=Trigger.oldMap.get(con.Id).AccountId){
                   setAccIds.add(con.AccountId);
                setAccIds.add(Trigger.oldMap.get(con.Id).AccountId);
                }
            }        
        }
    }
    if(Trigger.isDelete){
        if(trigger.isAfter){
        for(Contact con : Trigger.old) { 
            if(con.AccountId != null){
            setAccIds.add(con.AccountId);
                }
            }
        }
    }    
    for(Account acc :[Select id,Total_Contacts__c ,(Select id,name from contacts) from Account where Id in : setAccIds]){
        acc.Total_Contacts__c = acc.contacts.size();
        acclist.add(acc);
    }
    if(acclist.size()>0){
        update accList;     
    }
}
Please Mark It As Best Answer If it Helps
Thank You!

All Answers

CharuDuttCharuDutt
Hii Akshay Shrivastava
Try The Below Code 
EXAMPLE::
trigger NumberOfChild on Contact (After Insert,After Update,After Delete) {
    List<Account> accList=new List<Account>();
    Set<Id> setAccIds = new Set<Id>();
    if(Trigger.isInsert){
         if(trigger.isAfter){
        for(Contact con : Trigger.new){
            if(con.AccountId != null){
            setAccIds.add(con.AccountId);
                }
            }
        }
    } 
    system.debug('setAccIds ==> '+setAccIds);
    if(Trigger.isUpdate){
         if(trigger.isAfter){
        for(Contact con : Trigger.new){ 
            if(con.AccountId!=Trigger.oldMap.get(con.Id).AccountId){
                   setAccIds.add(con.AccountId);
                setAccIds.add(Trigger.oldMap.get(con.Id).AccountId);
                }
            }        
        }
    }
    if(Trigger.isDelete){
        if(trigger.isAfter){
        for(Contact con : Trigger.old) { 
            if(con.AccountId != null){
            setAccIds.add(con.AccountId);
                }
            }
        }
    }    
    for(Account acc :[Select id,Total_Contacts__c ,(Select id,name from contacts) from Account where Id in : setAccIds]){
        acc.Total_Contacts__c = acc.contacts.size();
        acclist.add(acc);
    }
    if(acclist.size()>0){
        update accList;     
    }
}
Please Mark It As Best Answer If it Helps
Thank You!
This was selected as the best answer
Akshay ShrivastavaAkshay Shrivastava
But I want to do on custom objects..which have lookup relationships 
Akshay ShrivastavaAkshay Shrivastava
yaa it help but error occurs ..varible does not exist
in place of AccountID we have to write our lookup relation field name


trigger triggerName on child__c (After Insert,After Update,After Delete) {
    List<parent__c> accList=new List<parent__c>();
    Set<Id> setAccIds = new Set<Id>();
    if(Trigger.isInsert){
         if(trigger.isAfter){
        for(child__c con : Trigger.new){
            if(con.task1__c != null){                                              // task1__c is field name of lookup relationship
            setAccIds.add(con.task1__c);
                }
            }
        }
    } 
    system.debug('setAccIds ==> '+setAccIds);
    if(Trigger.isUpdate){
         if(trigger.isAfter){
        for(child__c con : Trigger.new){ 
            if(con.task1__c!=Trigger.oldMap.get(con.Id).task1__c){
                   setAccIds.add(con.task1__c);
                setAccIds.add(Trigger.oldMap.get(con.Id).task1__c);
                }
            }        
        }
    }
    if(Trigger.isDelete){
        if(trigger.isAfter){
        for(child__c con : Trigger.old) { 
            if(con.task1__c != null){
            setAccIds.add(con.task1__c);
                }
            }
        }
    }    
    for(parent__c acc :[select id,noOfrecords__c , (Select id,name from childs__r) from parent__c where Id in : setAccIds]){
        acc.noOfrecords__c = acc.childs__r.size();
        acclist.add(acc);
    }
    if(acclist.size()>0){
        update accList;     
    }
}
Akshay ShrivastavaAkshay Shrivastava
THANKS Charu Dutt
CharuDuttCharuDutt
Hii  Akshay Shrivastava
Please Mark It As Best Answer If it Helps So It Can Help Others In Future.And It Motivates us To Give More In Community
Thank You!