Call action from action. Is it good?

first_controller.rb

class FirstController < ApplicationController
  def edit
    prepare_model_for_form
  end

  def update
    current_user.attributes = params[:user]
    current_user.validates_email!

    if current_user.save
      redirect_to root_path
    else
      prepare_model_for_form
      render :edit
    end
  end


  private

  def prepare_model_for_form
    current_user.build_institution unless current_user.institution
    2.times { current_user.fields_of_interests.build }
    2.times { current_user.fields_of_studies.build }
  end
end

second_controller.rb

class SecondController < ApplicationController
  def edit
    prepare_model_for_form
    render :edit
  end

  def update
    current_user.attributes = params[:user]
    current_user.validates_email!

    if current_user.save
      redirect_to root_path
    else
      edit
    end
  end


  private

  def prepare_model_for_form
    current_user.build_institution unless current_user.institution
    2.times { current_user.fields_of_interests.build }
    2.times { current_user.fields_of_studies.build }
  end
end