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# app/models/target.rb
class Target < ApplicationRecord
has_many :target_allocations, dependent: :destroy
has_many :nutrient_profiles, through: :target_allocations
accepts_nested_attributes_for :target_allocations, allow_destroy: true
validate :percentages_sum_to_100
def weighted_requirements
totals = Hash.new(0.0)
denom = 100.0
target_allocations.includes(:nutrient_profile).each do |alloc|
profile = alloc.nutrient_profile
next unless profile
weight = (alloc.percentage || 0).to_f / denom
next if weight <= 0
# Prefer the helper, but gracefully fall back to slicing attributes.
reqs = if profile.respond_to?(:requirements_hash)
profile.requirements_hash
else
profile.attributes.slice(*NutrientProfile::NUTRIENT_KEYS.map(&:to_s))
end
reqs.each do |nutrient_key, value|
next if value.nil?
totals[nutrient_key.to_s] += value.to_f * weight
end
end
totals
end
private
def percentages_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 égale à 100%") unless (sum - 100.0).abs <= 0.01
end
end
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