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Alex Rivera
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I have two tables with a many to many relationship that I am using has_and_belongs_to_many to define the association. class Foo < ActiveRecord::Base ... has_and_belongs_to_many :bar ... end class Bar < ActiveRecord::Base ... has_and_belongs_to_many :foo ... end I also have the class defined to represent the join table class BarFoo < ActiveRecord::Base ... belongs_to :foo belongs_to :bar ... end When I run rake db:seed I get the following error: Primary key is not allowed in a has_and_belongs_to_many join table (bar_foo) If I edit the database and remove the primary key field (ID) from the bar_foo table and then rerun rake db:seed everything works as desired. Given the above, what is the preferred means of creating join tables in rails with no primary key? I also tried using "has_many :bars, :through => :foo" and vise versa but got an error message something like "undefined method 'klass' for nil:NilClass".
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