app/controllers/recipes_controller.rb


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class RecipesController < ApplicationController
   def show
     @latest = NutrientMeasurement.order(:measured_on).last || NutrientMeasurement.new
     @target = TargetNutrientCalculator.call
     volume = (params[:volume].presence || 100_000).to_i
     @recipe = FertilizerRecipeCalculator.call(@latest, @target, water_volume_l: volume)
  end
end