Fixing Rails nested attributes on collections with sti>’Manager’).class != Manager, which makes a lot of problems with single table inheritance, especially when dealing with accepts_nested_attributes_for / fields_for that rely on correct class of the associated.

# Make build associations have their given type
# Makes that:>Manager).class == Manger
class ActiveRecord::Reflection::AssociationReflection
  def build_association(*options)
    if options.first.is_a?(Hash) and options.first[:type].presence

rails issue

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