has_many and HABTM in one model

rubyonrails-talk
1

Hello,

If i have a has_many and an HABTM relationship what is the best way to manage this? I.E.,

user

2

use something like the following (untested)

user.rb

# each user can share a number of books has_and_belongs_to_many :shared_books, :join_table => 'shared_books', :class_name => 'book'

book.rb

# a book can belong to many users has_and_belongs_to_many :shared_users, :join_table => 'shared_books', :class_name => 'user'

Mike

3

thanks I will try this. I wasnt sure if you can do

has_many :books has_and_belongs_to_many :shared_books, :join_table => ‘shared_books’, :class_name => ‘book’

in the same model.

Adam

4

unfortunately this didnt work… i had this in my User model

has_many :books has_and_belongs_to_many :shared_books, :join_table => ‘shared_books’, :class_name => :book

and this in the book model

belongs_to :user has_and_belongs_to_many :shared_books, :join_table => ‘shared_books’, :class_name => :user

TypeError: can’t convert Symbol into String from /usr/lib/ruby/gems/1.8/gems/activerecord- 1.15.3/lib/active_record/base.rb:1087:in type_name_with_module' from /usr/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/base.rb:1356:in compute_type’ from /usr/lib/ruby/gems/1.8/gems/activerecord- 1.15.3/lib/active_record/reflection.rb:125:in klass' from /usr/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/associations/has_and_belongs_to_many_association.rb:158:in construct_sql’ from /usr/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/associations/has_and_belongs_to_many_association.rb:6:in initialize' from /usr/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/associations.rb:934:in shared_books’

    from (irb):2