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5 changes: 4 additions & 1 deletion lib/jsonapi/resource_serializer.rb
Original file line number Diff line number Diff line change
Expand Up @@ -306,7 +306,10 @@ def foreign_key_value(source, relationship)
def foreign_key_types_and_values(source, relationship)
if relationship.is_a?(JSONAPI::Relationship::ToMany)
if relationship.polymorphic?
source._model.public_send(relationship.name).pluck(:type, :id).map do |type, id|
relationship_model = relationship.options[:class_name].constantize
type_key = relationship_model.inheritance_column
id_key = relationship_model.primary_key
source._model.public_send(relationship.name).pluck(type_key.to_sym, id_key.to_sym).map do |type, id|
[type.underscore.pluralize, IdValueFormatter.format(id)]
end
else
Expand Down