The “get-item” operator is used to look up a field from a record. Within
templates attribute access automatically falls back to this operator which
is why you can typically access
foo.bar instead of
foo['bar'] unless a
conflict with a record property exists.
All available fields can be accessed this way (model defined fields as well as system fields which are prefixed by an underscore).
for child in this.children: print('ID: %s' % child['_id'])