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Automatically email invoices with a trigger

Automatically send an email when a Quote is Accepted
Example of calling a function when the Status value of the Quote object becomes Accepted:
trigger Quote on Quote (after update) {
public List<Quote> newObjList {get; set;}
public Map<Id, Quote> oldObj {get; set;}
newObjList = (List<Quote>)Trigger.new;
oldObj = (Map<Id, Quote>)Trigger.oldMap;
if (trigger.isAfter && trigger.isUpdate){
for(Quote qu : trigger.new){
if (qu.Status == 'Accepted' && qu.Status != oldObj.get(qu.id).Status){
// Pass the template Id and recordId as parameters
String templateId = DocumentCustomController.getTemplateId();
DocumentCustomController.triggeredSavePdf(qu.Id, templateId);
}
}
}
}

Example function to get a template ID from the template name:
public static String getTemplateId() {
String templateId = [SELECT Id
FROM SBLD__DocumentBuilder__c
WHERE name = 'BillingStatement'
WITH SECURITY_ENFORCED
ORDER BY CreatedDate DESC
LIMIT 1][0].Id;
return templateId;
}

Example function to send an email to the user:
public static void sendEmailToUser( List<String> listAttachement) {
// Add basic details to the email:
Messaging.SingleEmailMessage clsSingleEmailMessage = new Messaging.SingleEmailMessage();
clsSingleEmailMessage.setToAddresses(new List<String>{'[email protected]'});
clsSingleEmailMessage.setSubject('Email Subject');
clsSingleEmailMessage.setPlainTextBody('Email Body');
// Add attachment
ContentVersion clsContentVersion = [SELECT VersionData, PathOnClient FROM ContentVersion WHERE ContentDocumentId = :listAttachement.get(0) WITH SECURITY_ENFORCED][0];
Messaging.EmailFileAttachment clsEmailFileAttachment = new Messaging.EmailFileAttachment();
clsEmailFileAttachment.setFileName(clsContentVersion.pathOnClient);
clsEmailFileAttachment.setBody(clsContentVersion.versionData);
clsSingleEmailMessage.setFileAttachments(new Messaging.EmailFileAttachment[] {clsEmailFileAttachment});
// Send the prepared email
Messaging.sendEmail(new Messaging.SingleEmailMessage[]{clsSingleEmailMessage});
}

Example of saving a Document Template as a PDF
// Saving Document Template to PDF
@future(callout = true)
public static void triggeredSavePdf(String recordId, String templateId) {
// Create PDF
PageReference pdfPage = new PageReference('/apex/SBLD__DocumentBuilderTemplate?recordId=' + templateId + '&targetId=' + recordId);
Blob pdfContent;
if(Test.isRunningTest()) {
pdfContent = blob.valueOf('Unit.Test');
}else {
pdfContent = pdfPage.getContentAsPDF();
}
String title = 'BillingStatement.pdf';
// Add ContentVersion
ContentVersion cv = new ContentVersion();
cv.VersionData = pdfContent;
cv.Title = title;
cv.PathOnClient = title;
cv.OwnerId = UserInfo.getUserId();
cv.ContentLocation = 'S';
insert cv;
// Add ContentDocumentLink
Id conDocId = [SELECT ContentDocumentId FROM ContentVersion WHERE Id =:cv.Id WITH SECURITY_ENFORCED ].ContentDocumentId;
ContentDocumentLink cdl = new ContentDocumentLink();
cdl.ContentDocumentId = conDocId;
cdl.LinkedEntityId = recordId;
cdl.ShareType = 'V';
cdl.Visibility = 'AllUsers';
if (Schema.sObjectType.ContentDocumentLink.fields.ContentDocumentId.isCreateable()) {
Database.insert(cdl);
}
// Call the email send method with the attachment added
listAttachement = new List<String>{conDocId};
sendEmailToUser(listAttachement);
}