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class Target < ApplicationRecord
include NutrientVector
has_many :target_allocations, inverse_of: :target, dependent: :destroy
after_initialize :set_defaults, if: :new_record?
validate :allocations_sum_to_100
# Recompute when allocations change; keep it simple (memoized per instance)
def recompute_nutrients!
@nutrient_values = nil
nutrient_values
end
private
def nutrient_values
@nutrient_values ||= get_nutrient_values
end
def get_nutrient_values
sums = Hash.new(0.0)
allocs = target_allocations.includes(:nutrient_profile)
allocs.each do |alloc|
weight = alloc.percentage.to_f / 100.0
profile = alloc.nutrient_profile
NutrientVector::NUTRIENT_KEYS.each do |k|
sums[k] += profile.public_send(k).to_f * weight
end
end
# Ensure all keys exist, even when there are no allocations
NutrientVector::NUTRIENT_KEYS.each { |k| sums[k] ||= 0.0 }
sums.freeze
end
def set_defaults
self.name ||= "Cible #{Date.today + 1.month}"
if target_allocations.empty?
nutrient_profiles = NutrientProfile.limit(3)
nutrient_profiles.each do |profile|
target_allocations.build(nutrient_profile: profile, percentage: 0)
end
end
end
def allocations_sum_to_100
sum = target_allocations.reject(&:marked_for_destruction?).sum { |a| a.percentage.to_f }
errors.add(:base, "La somme des pourcentages doit être 100%") unless (sum - 100).abs < 0.01
end
end
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