Recursive Spanning Tree

Code

Class Product < Activerecord: Base
Acts_as_tree: Order =>   " Name "

Def self. Roots
Self. Find (: All,: Conditions=> [ " Parent_id =? " , 0 ])
End

Def is_leaf ?  
Return   ! Self. has_children ?
End

Def is_root ?  
Return Self. parent_id =   0  
End
End

 

Code

Module productshelper
Def get_tree (trees)
Tree_html =   "" ;
Trees. Each Do   | Tree |  
# If Tree. is_root?
Tree_html + =   " <Li> <span> # {tree. name} & nbsp; # {link_to ('modify', edit_admin_product_path (tree. ID)} </span> "
# End

If   ! Tree. Children. Empty ? Then
Tree_html + =   " <Ul> "   + Get_tree (tree. Children) +   " </Ul> "
End
Tree_html + =   " </LI> "
End
Return Tree_html
End
End

 

 

View:

 

< Ul ID = " Browser "   Class = " Filetree " >
<% = Get_tree (@ products) %>
</ Ul >