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Manoprabha Palpandian 
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On December 4, 2023,
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Manoprabha Palpandian
Check this code:-
trigger updateParent on hotel__c(after insert,after update){ map<id, hotel__c> hotelMap= new map< id, hotel__c>([select checkindate__c,checkoutdate__c,registration1__c from hotel__c where id IN: trigger.new]); set<id> sid= new set<id>(); for(hotel__c hotel: trigger.new){ if(hotel.registration1__c!=null){ sid.add(hotel.registration1__c);//lookup field with AirTravel object } } List<AirTravel__c> updateairtravel= new List<AirTravel__c>(); List<AirTravel__c> airtravel= new List<AirTravel__c>(); airtravel=[select arrival__c,departure__c from AirTravel__c where id IN: sid]; for(AirTravel__c air: airtravel){ for(hotel__c ho:hotelMap.values()){ if(air.id==ho.registration1__c){ air.arrival__c=ho.checkindate__c; air.departure__c= ho.checkoutdate__c; updateairtravel.add(air); } } } if(updateairtravel.size()>0){ update updateairtravel; } }In case you find any other issue please mention.
If you find your Solution then mark this as the best answer.
All Answers
Check this code:-
trigger updateParent on hotel__c(after insert,after update){ map<id, hotel__c> hotelMap= new map< id, hotel__c>([select checkindate__c,checkoutdate__c,registration1__c from hotel__c where id IN: trigger.new]); set<id> sid= new set<id>(); for(hotel__c hotel: trigger.new){ if(hotel.registration1__c!=null){ sid.add(hotel.registration1__c);//lookup field with AirTravel object } } List<AirTravel__c> updateairtravel= new List<AirTravel__c>(); List<AirTravel__c> airtravel= new List<AirTravel__c>(); airtravel=[select arrival__c,departure__c from AirTravel__c where id IN: sid]; for(AirTravel__c air: airtravel){ for(hotel__c ho:hotelMap.values()){ if(air.id==ho.registration1__c){ air.arrival__c=ho.checkindate__c; air.departure__c= ho.checkoutdate__c; updateairtravel.add(air); } } } if(updateairtravel.size()>0){ update updateairtravel; } }In case you find any other issue please mention.
If you find your Solution then mark this as the best answer.
public Registration1__c reg1 {get;set;}
public String editid {get;set;}
public Registrationcontroller()
{
reg1 = new Registration1__c();
}
public List<Registration1__c> getregisterlist(){
List<Registration1__c> listreg= new List<Registration1__c>();
listreg=[SELECT Id, Name, FirstName__c, LastName__c, Email__c, (SELECT id,name FROM Hotels__r),
(SELECT id,name FROM AirTravels__r) FROM Registration1__c];
return listreg;
}
public void editfunction() {
system.debug('editfunction inside===>'+editid);
reg1=[SELECT Id, Name, FirstName__c, LastName__c, Email__c FROM Registration1__c where id=:editid];
}
public void deletefunction() {
system.debug('editfunction inside===>'+editid);
List<Registration1__c> reg2=[SELECT Id, Name, FirstName__c, LastName__c, Email__c FROM Registration1__c where id=:editid];
delete reg2;
ApexPages.addMessage(new ApexPages.Message(ApexPages.SEVERITY.INFO,'Record deleted successfully'));
}
public void saveaction()
{
system.debug('saveaction inside===>'+reg1);
try{
upsert reg1;
Hotel__r.Registration__c=reg1.01I5g000001paEN;
AirTravel__r.Registration__c=reg1.01I5g000001paGd;
if(reg1.Id !=null){
ApexPages.addMessage(new ApexPages.Message(ApexPages.SEVERITY.INFO,'Record saved successfully'));
reg1 = new Registration1__c();
} else
{
ApexPages.addMessage(new ApexPages.Message(ApexPages.SEVERITY.ERROR,'Record not saved'));
}
}
Catch(Exception e)
{
System.debug(e.getMessage());
}
}
}
<apex:page controller="Registrationcontroller" id="theRepeat" sidebar="false" showHeader="true">
<apex:form >
<apex:pageBlock >
<apex:messages />
<apex:pageBlockSection columns="1" >
<apex:inputField label="FirstName" value="{!reg1.FirstName__c}"/>
<apex:inputField label="LastName" value="{!reg1.LastName__c}"/>
<apex:inputField label="Email" value="{!reg1.Email__c}"/>
</apex:pageBlockSection>
<apex:pageBlockButtons >
<apex:commandButton value="save" action="{!saveaction}" rerender="pg1,theTable" />
</apex:pageBlockButtons>
</apex:pageBlock>
<apex:pageBlock >
<apex:dataTable value="{!registerlist}" var="regvalue" id="theTable" width="100%">
<apex:facet name="caption">Registration List</apex:facet>
<apex:column headerValue="Reg ID"><apex:outputText value="{!regvalue.Name}" /> </apex:column>
<apex:column headerValue="FirstName"><apex:outputText value="{!regvalue.FirstName__c}" /> </apex:column>
<apex:column headerValue="LastName"><apex:outputText value="{!regvalue.LastName__c}" /> </apex:column>
<apex:column headerValue="Email"><apex:outputText value="{!regvalue.Email__c}" /> </apex:column>
<apex:repeat value="{!regvalue.Hotels__r}" var="c">
<apex:column value="{!c.Name}"/>
</apex:repeat>
<apex:repeat value="{!regvalue.AirTravels__r}" var="d">
<apex:column value="{!d.Name}"/>
</apex:repeat>
<apex:column >
<apex:commandLink value="Edit" action="{!editfunction}" rerender="pg1">
<apex:param name="cid" value="{!regvalue.id}" assignto="{!editid}"/>
</apex:commandLink> ||
<apex:commandLink value="Delete" action="{!deletefunction}" rerender="pg1,theTable">
<apex:param name="cid" value="{!regvalue.id}" assignto="{!editid}"/>
</apex:commandLink>
</apex:column>
</apex:dataTable>
</apex:pageBlock>
</apex:form>
</apex:page>
how to update my lookup fields in this code after the registration record saved and display the lookup customobject
AirTravel and Hotel custom objects lookup with Registration__c.
custom Object - AirTravel, Fields - Arrival and Departure Datatype- Picklist, AirCommands datatype= Textarea(long). Custom Object - Hotel, Fields - Check In Date and Check Out Date Datatype- Picklist, HotelCommands datatype= Textarea(long).
how to update the record