Not really implemented, would like some abstraction for this.
You can use FileExtract to read a file into a field.
t = FileExtract('/tmp/filename', output_field='_content') job.add_chain(t)
If you don’t need to keep a lot of different things, you can use the default output_field (subject, context) that is _. It can be handy as transforms that only act on one field will read this one by default.
t1 = FileExtract('/tmp/file.csv') t2 = CsvMap() job.add_chain(t1, t2)