Ruby on Rails

In my case, I didn't need any additional attribute in my join table. So I user has_and_belongs_to_many. If you need additional attributes in you join table, you should create a model for it and use has_many through

https://guides.rubyonrails.org/association_basics.html#the-has-many-through-association

  --  Nielson Rolim  nielson.rolim@gmail.com

On Sunday, September 23, 2018 at 10:44:50 AM UTC-4, Nielson Rolim wrote:

I'd suggest you create your own solution without ancestry.

I had a similar problem. I have an User model and each user must has one or more parents and one or more children. So I created a join table called users_parents with two attributes user_id and parent_id. In my User model I added to has_and_belongs_to_many entries:

has_and_belongs_to_many :parents, class_name: User, join_table: :users_parents, foreign_key: :user_id, association_foreign_key: :parent_id

has_and_belongs_to_many :children, class_name: User, join_table: :users_parents, foreign_key: :parent_id, association_foreign_key: :user_id

That way, I can add an user as parent of several users or an user as child of several users.

my_user.parents will return all my_user parents and my_user.children will return all my_user children

--  Nielson Rolim  nielso...@gmail.com

On 23/09/2018 08:06, fugee ohu wrote:

I wanna create and edit people but ancestry only provides for one parent_id so how can i have two on a form

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Thanks What's the difference between that and has_many through approach?

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