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例子

请访问https://trailhead.salesforce.com/en/users/strailhead/trailmixes/prepare-for-your-salesforce-platform-developer-i-credential查看若List转Map，一般格式是Map<Id,Object>,trigger 的new中before insert ，直接给对应值赋值即可，无需插入...

Apex 代码是不能修改 CreatedDate，测试时可通过Test.setCreatedDate(ID,DateTime);Test.setCreatedDate(obj.Id, DateTime.newInstance(2021,4,29));Test.setCreatedDate(member.Id,System.now().addDays(-2 * 7) );方式模拟修改记录的创建时间去测试...