i have two table, comment and post, both have composite keys, and no id column, comment belongs to post, i follow the instruction of http://compositekeys.rubyforge.org/, and it seems successfully, (But i still cant confirm to put require 'rubygems' and require 'composite_primary_keys' on which file ). I can do the CRUD operation for post,then i want to create comment form, in the _form.html.erb, the code likes below: <%= form_for([@post, @post.comments.build]) do |f| %> then i got an error,"unknown attribute: comment_id", i think the build method need the parameter id which is default, but i dont have this column,and i cant change any thing in the database,how to resolve this problem?Thanks .
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