Fixed yield parser; fixed N+1 query issue

app/controllers/recipes_controller.rb

@@ -98,7 +98,7 @@ class RecipesController < ApplicationController
   private
     # Use callbacks to share common setup or constraints between actions.
     def set_recipe
-      @recipe = Recipe.includes(recipe_ingredients: :ingredient).find(params[:id])
+      @recipe = Recipe.includes(recipe_ingredients: {ingredient: :ingredient_units }).find(params[:id])
     end
 
     # Never trust parameters from the scary internet, only allow the white list through.

lib/yield_parser.rb

@@ -4,15 +4,19 @@ class YieldParser
 
   def self.parse(yield_string)
 
-    match = /(\d+(?:\.\d*)?)\s*(\w[\w\s]*)?/.match(yield_string)
+    begin
+      vu = UnitConversion::parse(yield_string)
+    rescue UnparseableUnitError
+      vu = nil
+    end
 
     case
-      when match.nil?
+      when vu.nil?
         nil
-      when match[2]
-        Result.new(match[1].to_f, match[2].strip.singularize)
+      when vu.unit.nil?
+        Result.new(vu.raw_value.to_f, 'each')
       else
-        Result.new(match[1].to_f, 'each')
+        Result.new(vu.raw_value.to_f, vu.unit.to_s.singularize)
     end
   end
 

spec/lib/yield_parser_spec.rb

@@ -7,6 +7,8 @@ RSpec.describe YieldParser do
     expect(YieldParser.parse('4 servings')).to eq YieldParser::Result.new(4.0, 'serving')
     expect(YieldParser.parse('3 pancakes')).to eq YieldParser::Result.new(3.0, 'pancake')
     expect(YieldParser.parse('13.5 large croutons')).to eq YieldParser::Result.new(13.5, 'large crouton')
+
+    expect(YieldParser.parse('1 1/2 pints')).to eq YieldParser::Result.new(1.5, 'pint')
   end
 
 end