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Rajesh SFDC how to get last modified field values from case history object
here my requirments i want to get whose last modified fileds values to update to case object
using apex trigger
here my code given below:
trigger TrackigHistory on Case (before update)
{
set<Id> setId = new set<Id>();
string strhistory;
for(Case con: trigger.new)
{
setId.add(con.Id);
List<CaseHistory> ch = [Select id,CaseId, Field, NewValue, OldValue from CaseHistory where CaseId = :setId ];
system.debug('&&&&&&&CaseHistory size&&&&&&&&&&'+ch.size());
// for(integer i=0;i<ch.size();i++)
for(CaseHistory c: ch)
{
// if(ch[i].Field != NULL && ch[i].OldValue != NULL && ch[i].NewValue != NULL)
//{
system.debug('&&&&&&&CaseHistory&&&&&&&&& '+'Field '+c.Field +' Changed from ' +c.OldValue+' to ' +c.NewValue);
con.Track_status_history__c = 'Field '+c.Field +' Changed from ' +c.OldValue+' to ' +c.NewValue;
how to get fields values last modified field values updat to case object
//}
}
}
}
using apex trigger
here my code given below:
trigger TrackigHistory on Case (before update)
{
set<Id> setId = new set<Id>();
string strhistory;
for(Case con: trigger.new)
{
setId.add(con.Id);
List<CaseHistory> ch = [Select id,CaseId, Field, NewValue, OldValue from CaseHistory where CaseId = :setId ];
system.debug('&&&&&&&CaseHistory size&&&&&&&&&&'+ch.size());
// for(integer i=0;i<ch.size();i++)
for(CaseHistory c: ch)
{
// if(ch[i].Field != NULL && ch[i].OldValue != NULL && ch[i].NewValue != NULL)
//{
system.debug('&&&&&&&CaseHistory&&&&&&&&& '+'Field '+c.Field +' Changed from ' +c.OldValue+' to ' +c.NewValue);
con.Track_status_history__c = 'Field '+c.Field +' Changed from ' +c.OldValue+' to ' +c.NewValue;
how to get fields values last modified field values updat to case object
//}
}
}
}
All Answers
Since this is a before trigger, this code would pick up the 2nd to last change since the latest change hasn't been registered. . And the whole thing breaks down if there are multiple fields update this would just pick randomly one based on how SFDC decides to log the changes.
If the issue that you want to track all fields, you're in for a bit of a wild ride.
My off-the-cuff approach would be to use a before trigger and use a describe call. Spitballing a bit here
trigger test on Case (before update) {
Map<string, Schema.SobjectField> caseFields = Schema.SObjectType.Case.fields.getMap();
For (Case cs : Trigger.new){
for (string fieldName : caseFields.keySet()){
if ( cs.get(fieldName) != Trigger.oldMap.get(cs.id).get(fieldName)) {
cs.Track_status_history__c = 'Field ' + fieldName + ' changed from ' + string.valueOf(Trigger.oldMap.get(cs.id).get(fieldName)) + ' to ' +string.valueOf(cs.get(fieldName));
}
}
}
}
There's likely to be issue with string.valueOf() but this should get you pointed in the right direction if you are trying to do this outside of the confines of the standard history tracking mechanism.
Date lastMod = trigger.oldMap.get(con.id).lastModifiedDate;
if ( cs.get(fieldName) != Trigger.oldMap.get(cs.id).get(fieldName) and fieldName != 'track_status_history__c') {
Also you may want to make track_status_history__c larger if possible to give more wiggle room
Also maybe add
string fieldUpdateText = 'Field ' + fieldName + ' changed from ' + string.valueOf(Trigger.oldMap.get(cs.id).get(fieldName)) + ' to ' string.valueOf(cs.get(fieldName))
if (fieldUpdateText.length() > caseFields.get('track_status_history__c').getDescribe().getLength()){
fieldUpdateText= fieldUpdateText.substring(0,caseFields.get('track_status_history__c').getDescribe().getLength()-1);//you should probably put the getDescribe().getLength() outside the loop since it wont change
}
Added 'order by createdDate desc' in SOQL ,So first record will be last modified field.
Please use below code and check ?
trigger TrackigHistory on Case (before update)
{
set<Id> setId = new set<Id>();
string strhistory;
for(Case con: trigger.new)
{
setId.add(con.Id);
List<CaseHistory> ch = [Select id,CaseId, Field, NewValue, OldValue from CaseHistory where CaseId = :setId order by createdDate desc ];
system.debug('&&&&&&&CaseHistory size&&&&&&&&&&'+ch.size());
// for(integer i=0;i<ch.size();i++)
for(CaseHistory c: ch)
{
// if(ch[i].Field != NULL && ch[i].OldValue != NULL && ch[i].NewValue != NULL)
//{
system.debug('&&&&&&&CaseHistory&&&&&&&&& '+'Field '+c.Field +' Changed from ' +c.OldValue+' to ' +c.NewValue);
con.Track_status_history__c = 'Field '+c.Field +' Changed from ' +c.OldValue+' to ' +c.NewValue;
how to get fields values last modified field values updat to case object
//}
}
}
}
hi Eli Flores, i am tried ur apex code. its fetch ing the all last modified field values,, i dont want that one,, i want to fetch only last modified field values,,
eg, 1. status=new 2. case reason = installtion, 3. case origin= phone, whose modified last field values want to display , suppose case origin field ,, previous phone values, suppose i am changed for phone to web,, display old values nd new values,, but in ur code,, fetching all modified field values .. only i fetch last field values display it,,
{
Map<string, Schema.SobjectField> caseFields = Schema.SObjectType.Case.fields.getMap();
For (Case cs : Trigger.new)
{
for (string fieldName : caseFields.keySet())
{
system.debug('$$$$$$fieldname$$$44'+fieldName);
if ( cs.get(fieldName) != Trigger.oldMap.get(cs.id).get(fieldName))
{
datetime cc= system.now();
if(trigger.oldMap.get(cs.id).lastModifiedDate == cc)
{
cs.Track_status_history__c = 'Field ' + fieldName + ' changed from ' + string.valueOf(Trigger.oldMap.get(cs.id).get(fieldName)) + ' to ' +string.valueOf(cs.get(fieldName));
===== here only fetch a last modified field values how to solve,, ===================>
system.debug('$$$$$$$$$$$$$$$$'+cs.Track_status_history__c);
}
}
}
}
}
if ( cs.get(fieldName) != Trigger.oldMap.get(cs.id).get(fieldName))
{
....
//we've found one changed value, let's exit the loop
break;
}
Though as a side note, it's hard for me to see the above code working. It would take a bit of luck to get this check to work
datetime cc= system.now();
if(trigger.oldMap.get(cs.id).lastModifiedDate == cc)
oldMap has the all the original values of the object (i.e the values prior to the current edit) and new has all updated value (the original field values + any that were updated in the last edit). The only way this would work if is the object was edited twice within a millisecond. I.e. the original (edit before the current edit) lastModified Date is now. So the last time it was edited prior to the current edit would have to be now.
I think I see where you might be going though. Is it you only want to capture the change to certain fields like origin, status, reason?
if so , it could be done with a couple simple edits:
set<string> trackedFields = new set<string>{'fieldApiName1', 'fieldApiName2', 'fieldApiName3'};//get these from the object page.
...
if ( trackedFields.contains(fieldName) && cs.get(fieldName) != Trigger.oldMap.get(cs.id).get(fieldName))//add this condition to the if statement
{
...
trigger test on Case (before update )
{
Map<string, Schema.SobjectField> caseFields = Schema.SObjectType.Case.fields.getMap();
case caseold=trigger.old[0];
For (Case cs : Trigger.new)
{
for (string fieldName : caseFields.keySet())
{
if ( cs.get(fieldName) != Trigger.oldMap.get(cs.id).get(fieldName))
{
// cs.Track_status_history__c = 'Field ' + fieldName + ' changed from ' + string.valueOf(Trigger.oldMap.get(cs.id).get(fieldName)) + ' to ' +string.valueOf(cs.get(fieldName));
string oldvalue = string.valueOf(caseold.get(fieldName));
string newvalue= string.valueOf(cs.get(fieldName));
cs.Track_status_history__c = 'Changed '+fieldName +' From '+oldvalue +' to '+ newvalue;
break;
}
}
}
}