rails/activerecord/test/fixtures/mixins.yml

# tree mixins
tree_1:
  id: 1001
  type: TreeMixin
  parent_id:
  
tree_2:
  id: 1002
  type: TreeMixin
  parent_id: 1001

tree_3:
  id: 1003
  type: TreeMixin  
  parent_id: 1002

tree_4:
  id: 1004
  type: TreeMixin  
  parent_id: 1001

tree2_1:
  id: 1005
  type: TreeMixin
  parent_id:

tree3_1:
  id: 1006
  type: TreeMixin
  parent_id:

tree_without_order_1:
  id: 1101
  type: TreeMixinWithoutOrder
  parent_id:

tree_without_order_2:
  id: 1100
  type: TreeMixinWithoutOrder
  parent_id:

# List mixins

<% (1..4).each do |counter| %>  
list_<%= counter %>:
  id: <%= counter+1006 %>
  pos: <%= counter  %>
  type: ListMixin
  parent_id: 5
<% end %>

# Nested set mixins

<% (1..10).each do |counter| %>  
set_<%= counter %>:
  id: <%= counter+3000 %>
  type: NestedSet
<% end %>

# Big old set
<%
[[4001, 0, 1, 20],
  [4002, 4001, 2, 7],
  [4003, 4002, 3, 4],
  [4004, 4002, 5, 6],
  [4005, 4001, 8, 13],
  [4006, 4005, 9, 10],
  [4007, 4005, 11, 12],
  [4008, 4001, 14, 19],
  [4009, 4008, 15, 16],
  [4010, 4008, 17, 18]].each do |set| %>
tree_<%= set[0] %>:
  id: <%= set[0]%>
  parent_id: <%= set[1]%>
  type: NestedSetWithStringScope
  lft: <%= set[2]%>
  rgt: <%= set[3]%>
  root_id: 42

<% end %>