The vision

Each tree provider integrates into an existing workflow:

• load by id

  hook load

• save

  hook presave

  hook update

  hook insert

• delete

  hook delete

• build a query based on the tree information, supporting: ->condition() ->order()

Query integration

parent($item):

ancestors($item):

Simple

Materialized path

What needs to happen on save?

• Generate the materialized path for new items.

Field integration

• Provide an extension of EFQ that can: ->parentOf($field_name, $item) ->ancestorsOf($field_name, $item) ->childrenOf($field_name, $item)

• Provide a Views handler for sort by tree order

• On save:

  • Build the lineage for new items or for changed items
  • Reparent the children of the current item

• On delete:

  • Reparent the children, or
  • Delete the children