Best Practices to Handle Routes For Sti Subclasses in Rails

Can I do STI and still use polymorphic path helpers?

Yep, just use AR::Base#becomes.

Say your base class is Account, which is subclassed to GuestAccount and LoginAccount.

@account.is_a? LoginAccount? #=> true

Then you can just do a

form_for [@account.becomes(Account), @comment] do |f|
  ...

Rails STI has_many STI children of one type

I ended up finding a solution:

I need to specify the class_name in has_many like so

has_many :C, :foreign_key => :parent_id,  class_name: 'C::C1'

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