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Populate child records field value on parent record

  Populate child records field value on parent record by using apex trigger when child   record is inserted. *** trigger ContactTrigger on Contact (after insert) {     if(Trigger.isAfter && Trigger.isInsert){         ContactTriggerHandler.populateNameOnParent(Trigger.new);     } } *** *** // populate child records name on parent field when child record is inserted     public static void populateNameOnParent(List<Contact> contactList){         Map<Id,List<Contact>> contactWithAccId = new Map<Id,List<Contact>>();         Set<Id> accountIds = new Set<Id>();         List<Account> accountsList = new List<Account>();         String concatenateString;         for(Contact cont : contactList){             if(cont.AccountId != null)             {                 accountIds.add(cont.AccountId); // get account id from contacts             }         }          // get all contacts related to account ids         if(accountIds.size() > 0
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Get picklist values in apex

  We can get picklist values and their labels in apex. *** //get picklist values     public static void getPicklistValues(){         Map<String, String> pickListValuesMap = new Map<String, String>();         Schema.DescribeFieldResult fieldResult = Account.Industry .getDescribe();         List<Schema.PicklistEntry> pEntry = fieldResult.getPicklistValues();         for( Schema.PicklistEntry pickListVal : pEntry){             pickListValuesMap.put(pickListVal.getValue(),pickListVal.getLabel());         }              System.debug('pickListValuesMap ##'+ pickListValuesMap);     } By using this method you can get any picklist values from any object(Standard or Custom). ***
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Get current user information in apex

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  We can get current logged in user full information from predefined methods in apex. *** // get current user id         String loggedUserId = UserInfo.getUserId(); // get current user name         String loggedUserName = UserInfo.getName();   // get current user username         String loggedUserUserName = UserInfo.getUserName();          // get current user email         String loggedUserEmail = UserInfo.getUserEmail();          // get current user language         String loggedUserLanguage = UserInfo.getLanguage();          // get current user profile id         String loggedUserProfileId = UserInfo.getProfileId();          // get current user role id         String loggedUserRoleId = UserInfo.getUserRoleId();          // get current user locale         String loggedUserLocale = UserInfo.getLocale();                  System.debug('loggedUserId $$ ' + loggedUserId);         System.debug('loggedUserUserName $$ ' + loggedUserUserName);         System.debug('loggedUs
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Show only DML exception message from parent exception

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In below code we just put account name is blank as we know it is required field so when DML will be execute then it will throw an exception. *** public static void showDMLException(){         Account acctRecord = new Account();         acctRecord.Name = '';         try{             INSERT acctRecord;         }catch(Exception ex){             System.debug('exception$$ ' + ex);             if(ex.getTypeName() == 'System.DMLException' || ex.getTypeName() == 'System.MailException'){                 System.debug('dml exception$$ ' + ex.getDMLMessage(0));                }         }     } *** System.debug('exception$$ ' + ex); This statement will show complete exception message. But we need only DML exception message so this message we can get from below conditions. if(ex.getTypeName() == 'System.DMLException' || ex.getTypeName() == 'System.MailException'){      System.debug('dml exception$$ ' + ex.getDMLMessage(0));    }
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Get sObject prefix

  Pass object name in method parameter. *** public static void getPrefix(String objName){         Schema.sObjectType sObjType = Schema.getGlobalDescribe().get(objName);         String prefixValue = (sObjType.getDescribe().getKeyPrefix());         System.debug('prefixValue##' + prefixValue);     } *** OR you can get prefix value from here *** Schema.DescribeSObjectResult r = Account .sObjectType.getDescribe(); String keyPrefix = r.getKeyPrefix(); System.debug('keyPrefix##' + keyPrefix); *** Replace Account object from your object name.
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