without_children:
  field: without_children

with_hm_children:
  field: with_hm_children
  hm_children:
    first:
      field: 1
    second:
      field: 2

with_children:
  field: with_children
  children:
    third:
      field: 3
    fourth:
      field: 4

with_through_children:
  field: with_through_children
  through_children:
    fifth:
      field: 5
    sixth:
      field: 6
      
with_as_children:
  field: with_as_children
  as_children:
    seventh:
      field: 7
    eighth:
      field: 8