How can I save an email to a Case?

Question

We have a requirement to use an email template to reply to a Case, save the email in the Case's Activity History, and update the Case's status. I have the email being sent and the status updating, but the email is only saved on the associated Contact, not the Case.

How can I get the email to also show on the Case? We are using the service console and Case Feed view, and the code is being invoked through publisher action that calls a VF page.

Current code:

List<Messaging.SingleEmailMessage> messages = new List<Messaging.SingleEmailMessage>();
Messaging.SingleEmailMessage theMessage = new Messaging.SingleEmailMessage();
theMessage.setTemplateId(emailTemplateId);
theMessage.setTargetObjectId(this.myCase.ContactId);
List<String> toAddress = new List<String>();
toAddress.add(this.myCase.Contact.Email);
theMessage.setToAddresses(toAddress);
theMessage.setWhatId(this.myCase.Id); 
theMessage.setSaveAsActivity(true); // Only saves to TargetObjectId
messages.add(theMessage);    
Messaging.SendEmailResult[] results = Messaging.sendEmail(messages);

Answer 1

you can simply create this , regarding to your code you would need to instantiate the EmailTemplate object and load it into your instance variable with all necessary info

http://www.salesforce.com/developer/docs/api/Content/sforce_api_objects_emailtemplate.htm

EmailTemplate ET = new EmailTempalte([Select id,Body, HtmlValue,Subject FROM EmailTemplate Where Id =: emailTemplateId]);

this below saves an email under emails related list in the case

 EmailMessage em = new EmailMessage();
               em.subject = ET.subject;
               em.body = ET.body;
               em.HtmlBody = ET.htmlValue;
               em.ParentId = case.id;
               insert em;

only issue on this method is that all merge fields will be empty but you can easily replace the merge field placeholder if you have the values in your code at hand with the string.replace(x,y) method assuming htmlval is a string and you have the contact firstname in mycase.contactFirstname stored use htmlval.replace('{!Contact.firstName}',mycase.contactFirstname); before inserting em