Nested form update action producing duplicate results

Question

During the update action of a nested form, instead of updating the current nested records, it seems to create new nested records.

This is what my controller looks like

Answer 1

update_only does not work for has_many relationships. You need to add the nested attribute :id field to your strong parameters:

def application_params
   params.require(:application).permit(:job_id, :user_id, 
     answers_attributes:[:id, :question_id, :content]).merge(user_id: current_user.id,
     job_id: params[:job_id])
end

Answer 2

Try adding update_only to your call to accepts_nested_attributes_for.

accepts_nested_attributes_for :nested_attribute, update_only: true