tutorial22TraversingTheRelationshipField

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//Now create the invoice record and relate it with the Customer object 
//Before executing this, please create a Customer Records with Name 'Customer Creation Test'
APEX_Invoice__c objInvoice = new APEX_Invoice__c();

//Relating Invoice to customer via id field of Customer object
objInvoice.APEX_Customer__c = [SELECT id FROM APEX_Customer__c WHERE Name = 'Customer Creation Test' LIMIT 1].id;
objInvoice.APEX_Status__c = 'Pending';
insert objInvoice;//Creating Invoice
System.debug('Newly Created Invoice'+objInvoice);//Newly creted invoice