class NutrientMeasurement < ApplicationRecord
  include NutrientVector

  validates :measured_on, presence: true
  validates :measured_on, uniqueness: true

  def self.data_series_for(*nutrients)
    nutrients.map do |formula|
      { name: formula, data: self.order(:measured_on).pluck(:measured_on, formula) }
    end
  end

  private

  def nutrient_values
    @nutrient_values ||= NutrientVector::NUTRIENT_KEYS.index_with do |k|
      read_attribute(k).to_f
    end
  end
end