Complex Association - Please help

rubyonrails-talk
1

Hi All,          I am a newbie in rails. I am creating a new rails application. Here I have 4 models.

1. User 2. Item 3. Application 4. Tag

The concept is

- Item belongs to User - Item has many Tags - Item has many application through tags - Tags are hierarchical (i.e a tree structure, a child tag can be related to a parent tag.)

Please help me, how to handle these Associations.

Thanks Hirak

2

comments inline

Hi All,

     I am a newbie in rails. I am creating a new rails

application. Here I have 4 models.

  1. User

  2. Item

  3. Application

  4. Tag ok

The concept is

  • Item belongs to User

  • Item has many Tags

It means you have tags table will have item_id

  • Item has many applications through tags

for above you must have some relations between application and tags table.

  • Tags are hierarchical (i.e a tree structure, a child tag can be

related to a parent tag.)

tag belongs_to parent_tag :class_name => “Tag”, :foreign_key => “parent_id”

You must have parent_id field in tags table. If parent_tag is nil then you can identify tag as child_tag

Please help me, how to handle these Associations.

Thanks

Hirak

hope this will help !

-Sandip R~

3

Thanks Sandip you got it almost right, but what I meant is

Items table will have tag_id

How that association needs to be handled ?

Thanks again for your reply.

-- Hirak