class NutrientProfile < ApplicationRecord
  # Align these keys with your schema columns (per your schema.txt)
  NUTRIENT_KEYS = %i[
    nno3 p k ca mg s na cl si fe zn b mn cu mo nnh4
  ].freeze

  # Returns a Hash of nutrient => numeric requirement (nil kept; caller can skip nils)
  def requirements_hash
    attributes
      .slice(*NUTRIENT_KEYS.map(&:to_s)) # only nutrient columns
      .transform_keys(&:to_s)
  end
end