Thanks for pointing that out mahmoud modsaid wrote: > Actually in has_and_belongs_to_many association, the joint table MUST > NOT have an id > > in the migration for creating the join table, you need to skip the > default id creation... check the attribute :id for creating table in > the api > http://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/SchemaStatements.html#M001090 > > for details > http://blog.modsaid.com/2008/09/hasandbelongstomany-duplicate-entry.html > > mahmoud,
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