Added adjusting ingredient amount

app/controllers/concerns/finders.rb

@@ -8,6 +8,13 @@ module Concerns::Finders
     render_404
   end
 
+  def find_ingredient
+    @ingredient = Ingredient.find(params[:id])
+    @project = @ingredient.composition.project
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+
   def find_food
     @food = Food.find(params[:id])
     @project = @food.project

app/controllers/ingredients_controller.rb

@@ -5,6 +5,8 @@ class IngredientsController < ApplicationController
   before_action :authorize
 
   def adjust
-    params.require(:ingredient).permit(:adjustment)
+    amount = params[:adjustment].to_i
+    @ingredient.amount += amount if @ingredient.amount > -amount
+    @ingredient.save
   end
 end

app/controllers/meals_controller.rb

@@ -40,14 +40,11 @@ class MealsController < ApplicationController
   end
 
   def update_notes
-    if @meal.update(params.require(:meal).permit(:notes))
-      flash[:notice] = 'Updated meal notes' unless @meal.previous_changes.empty?
-    end
+    @meal.update(params.require(:meal).permit(:notes))
   end
 
   def toggle_eaten
     @meal.toggle_eaten!
-    flash[:notice] = 'Updated meal status'
     prepare_meals
   end