Examples of DataWeave in Apex

To use DataWeave in Apex, follow these instructions with associated examples.

• Create a DataWeave script source file.
  For example: csvToContacts.dwl.

  %dw 2.0
  input records application/csv
  output application/apex
  ---
  records map(record) -> {
   FirstName: record.first_name,
   LastName: record.last_name,
   Email: record.email
  } as Object {class: "Contact"}
  

• Create the associated metadata file.

  For example: csvToContacts.dwl-meta.xml.

  <?xml version="1.0" encoding="UTF-8"?>
  <DataWeaveResource xmlns="http://soap.sforce.com/2006/04/metadata">
      <apiVersion>58.0</apiVersion>
      <isGlobal>false</isGlobal>
  </DataWeaveResource>
  

• Push the source to the scratch org using Salesforce CLI version v7.151.9 or higher. See Salesforce CLI Release Notes.
• Invoke the DataWeave script from Apex and check the results from anonymous Apex.
  This example invokes the csvToContacts.dwl script.

  // CSV data for Contacts
  String inputCsv = 'first_name,last_name,email\nCodey,"The Bear",codey@salesforce.com'; 
  DataWeave.Script dwscript = new DataWeaveScriptResource.csvToContacts();
  DataWeave.Result dwresult = dwscript.execute(new Map<String, Object>{'records' => inputCsv});
  List<Contact> results = (List<Contact>)dwresult.getValue();
  
  Assert.areEqual(1, results.size());
  Contact codeyContact = results[0];
  Assert.areEqual('Codey',codeyContact.FirstName);
  Assert.areEqual('The Bear',codeyContact.LastName);