rai

app/models/ingredient_proxy.rb

@@ -0,0 +1,25 @@
+class IngredientProxy
+
+  attr_reader :ingredient
+
+  def initialize(ingredient)
+    @ingredient = ingredient
+  end
+
+  def name
+    @ingredient.name
+  end
+
+  def density
+    @ingredient.density
+  end
+
+  def density?
+    @ingredient.density.present?
+  end
+
+  def get_custom_unit_equivalent(custom_unit_name)
+    @ingredient.custom_unit_weight(custom_unit_name)
+  end
+
+end

app/models/recipe.rb

@@ -69,6 +69,14 @@ class Recipe < ApplicationRecord
     self
   end
 
+  def yields_list
+    if self.yields.present?
+      self.yields.split(',').map { |y| y.strip }.select { |y| y.present? }
+    else
+      []
+    end
+  end
+
   def tag_names
     self.tags.map { |t| t.name }
   end
@@ -90,13 +98,6 @@ class Recipe < ApplicationRecord
     @nutrition_data
   end
 
-  def parsed_yield
-    if @parsed_yield.nil? && self.yields.present?
-      @parsed_yield = YieldParser.parse(self.yields)
-    end
-    @parsed_yield
-  end
-
   def update_rating!
     self.rating = Log.for_recipe(self).for_user(self.user_id).where('rating IS NOT NULL').average(:rating)
     save(validate: false)

app/models/recipe_ingredient.rb

@@ -1,13 +1,14 @@
 class RecipeIngredient < ApplicationRecord
 
   belongs_to :ingredient, optional: true
+  belongs_to :recipe_as_ingredient, class_name: 'Recipe', optional: true
   belongs_to :recipe, inverse_of: :recipe_ingredients, touch: true
 
   validates :sort_order, presence: true
 
   def name
-    if self.ingredient_id.present?
+    if self.ingredient_detail.present?
-      self.ingredient.name
+      self.ingredient_detail.name
     else
       super
     end
@@ -19,6 +20,45 @@ class RecipeIngredient < ApplicationRecord
     str
   end
 
+  def ingredient_detail_id
+    case
+      when recipe_as_ingredient_id
+        "R#{recipe_as_ingredient_id}"
+      when ingredient_id
+        "I#{ingredient_id}"
+      else
+        nil
+    end
+  end
+
+  def ingredient_detail_id=(val)
+    @recipe_detail = nil
+    case val
+      when -> (v) { v.blank? }
+        self.recipe_as_ingredient_id = nil
+        self.ingredient_id = nil
+      when /^R(\d+)$/
+        self.ingredient_id = nil
+        self.recipe_as_ingredient_id = $1.to_i
+      when /^I(\d+)$/
+        self.recipe_as_ingredient_id = nil
+        self.ingredient_id = $1.to_i
+      else
+        raise "Invalid ingredient_detail_id: #{val}"
+    end
+  end
+
+  def ingredient_detail
+    @recipe_detail ||= case
+                         when self.recipe_as_ingredient_id
+                           RecipeProxy.new(self.recipe_as_ingredient)
+                         when self.ingredient_id
+                           IngredientProxy.new(self.ingredient)
+                         else
+                          nil
+                       end
+  end
+
   def scale(factor, auto_unit = false)
     if factor.present? && self.quantity.present? && factor != '1'
 
@@ -54,7 +94,7 @@ class RecipeIngredient < ApplicationRecord
 
   def to_volume
     return unless self.quantity.present?
-    if ingredient && ingredient.density
+    if ingredient_detail && ingredient_detail.density?
       density = UnitConversion.parse(ingredient.density)
       if density.density?
         value_unit = UnitConversion.parse(self.quantity, self.units)
@@ -67,9 +107,9 @@ class RecipeIngredient < ApplicationRecord
   end
 
   def to_mass
-    if ingredient
+    if ingredient_detail
       value_unit = as_value_unit
-      density = self.ingredient.density? ? UnitConversion.parse(ingredient.density) : nil
+      density = self.ingredient_detail.density? ? UnitConversion.parse(ingredient_detail.density) : nil
 
       case
         when value_unit.nil?
@@ -85,17 +125,17 @@ class RecipeIngredient < ApplicationRecord
   end
 
   def custom_unit?
-    self.ingredient && self.ingredient.custom_unit_weight(self.units).present?
+    self.ingredient_detail && self.ingredient_detail.get_custom_unit_equivalent(self.units).present?
   end
 
   def can_convert_to_grams?
     vu = as_value_unit
-    vu.present? && (vu.mass? || (vu.volume? && self.ingredient && self.ingredient.density.present?))
+    vu.present? && (vu.mass? || (vu.volume? && self.ingredient_detail && self.ingredient_detail.density.present?))
   end
 
   def to_grams
     value_unit = as_value_unit
-    gram_unit = value_unit.convert('g', self.ingredient ? self.ingredient.density : nil)
+    gram_unit = value_unit.convert('g', self.ingredient_detail ? self.ingredient_detail.density : nil)
     gram_unit.raw_value
   end
 
@@ -104,7 +144,7 @@ class RecipeIngredient < ApplicationRecord
       when self.quantity.blank?
         nil
       when self.custom_unit?
-        self.ingredient.custom_unit_weight(self.units).scale(self.quantity)
+        self.ingredient_detail.get_custom_unit_equivalent(self.units).scale(self.quantity)
       when self.units.present?
         UnitConversion.parse(self.quantity, self.units)
       else
@@ -115,6 +155,7 @@ class RecipeIngredient < ApplicationRecord
   def log_copy
     copy = RecipeIngredient.new
     copy.ingredient = self.ingredient
+    copy.recipe_as_ingredient = self.recipe_as_ingredient
     copy.name = self.name
     copy.sort_order = self.sort_order
     copy.quantity = self.quantity

app/models/recipe_proxy.rb

@@ -0,0 +1,71 @@
+class RecipeProxy
+
+  attr_reader :recipe
+
+  def initialize(recipe)
+    @recipe = recipe
+    parse_yields
+  end
+
+  def name
+    @recipe.name
+  end
+
+  def density
+    @density
+  end
+
+  def density?
+    !self.density.nil?
+  end
+
+  def get_custom_unit_equivalent(custom_unit_name)
+    unit = @custom_yields.detect { |vu| vu.unit.unit == custom_unit_name }
+    known_unit = @unit_yields.first
+    if unit && known_unit
+      # ex:
+      # custom_unit_name: "rolls"
+      # yields: "3 rolls, 500 g"
+      # desired return: 166.6 g
+
+      ValueUnit.for(known_unit.value.value / unit.value.value, known_unit.unit)
+    end
+  end
+
+  private
+
+  def parse_yields
+    @custom_yields = []
+    @unit_yields = []
+    @density = nil
+
+    @recipe.yields_list.each do |y|
+      begin
+        vu = UnitConversion::parse(yield_string)
+      rescue UnparseableUnitError
+        vu = nil
+      end
+
+      if vu
+        if vu.unit.nil?
+          @custom_yields << ValueUnit.for(vu.value, 'servings')
+        elsif vu.mass? || vu.volume?
+          @unit_yields << vu
+        else
+          @custom_yields << vu
+        end
+      end
+
+    end
+
+    vol = @unit_yields.detect { |u| u.volume? }
+    mas = @unit_yields.detect { |u| u.mass? }
+    # ex
+    # vol: 2 cups
+    # mas: 7 oz
+    if vol && mas
+      @density = "#{mas.value.value / vol.value.value} #{mas.unit.original_unit}/#{vol.unit.original_unit}"
+    end
+  end
+
+end

app/views/recipes/_recipe.json.jbuilder

@@ -7,13 +7,15 @@ json.rendered_steps MarkdownProcessor.render(recipe.step_text)
 json.tags recipe.tag_names
 
 json.ingredients recipe.recipe_ingredients do |ri|
-  json.extract! ri, :id, :ingredient_id, :display_name, :name, :quantity, :units, :preparation, :sort_order
+  json.extract! ri, :id, :ingredient_detail_id, :display_name, :name, :quantity, :units, :preparation, :sort_order
 
-  json.ingredient do
+  json.ingredient_detail do
-    if ri.ingredient.nil?
+    if ri.ingredient.nil? && ri.ingredient_as_recipe.nil?
       json.null!
+    elsif ri.ingredient
+      json.extract! ri.ingredient, :name, :density, :notes
     else
-      json.extract! ri.ingredient, :id, :name, :density, :notes
+      json.extract! ri.recipe_as_ingredient, :name
     end
   end
 

db/migrate/20180823174505_add_recipe_as_ingredient_id.rb

@@ -0,0 +1,5 @@
+class AddRecipeAsIngredientId < ActiveRecord::Migration[5.2]
+  def change
+    add_column :recipe_ingredients, :recipe_as_ingredient_id, :integer
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2017_04_14_233856) do
+ActiveRecord::Schema.define(version: 2018_08_23_174505) do
 
   create_table "ingredient_units", force: :cascade do |t|
     t.integer "ingredient_id", null: false
@@ -83,6 +83,7 @@ ActiveRecord::Schema.define(version: 2017_04_14_233856) do
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.text "preparation"
+    t.integer "recipe_as_ingredient_id"
     t.index ["recipe_id"], name: "index_recipe_ingredients_on_recipe_id"
   end
 

spec/models/recipe_ingredient_spec.rb

@@ -24,6 +24,7 @@ RSpec.describe RecipeIngredient, type: :model do
   end
 
   describe '#can_convert_to_grams' do
+    describe 'with no ingredient detail' do
       it 'returns false if no quantity or unit' do
         ri = RecipeIngredient.new
         expect(ri.can_convert_to_grams?).to be_falsey
@@ -49,20 +50,32 @@ RSpec.describe RecipeIngredient, type: :model do
         expect(ri.can_convert_to_grams?).to be_truthy
       end
 
-    it 'returns false if unit is volume and there is no ingredient' do
+      it 'returns false if unit is volume' do
         ri = RecipeIngredient.new(quantity: '5 1/2', units: 'cups')
         expect(ri.can_convert_to_grams?).to be_falsey
       end
+    end
 
+    describe 'with ingredient' do
       it 'returns false if unit is volume and ingredient has no density' do
         ri = RecipeIngredient.new(quantity: '5 1/2', units: 'cups', ingredient: create(:ingredient))
         expect(ri.can_convert_to_grams?).to be_falsey
       end
 
-    it 'returns false if unit is volume and ingredient has density' do
+      it 'returns true if unit is volume and ingredient has density' do
         ri = RecipeIngredient.new(quantity: '5 1/2', units: 'cups', ingredient: create(:ingredient_with_density))
         expect(ri.can_convert_to_grams?).to be_truthy
       end
     end
 
+    describe 'with recipe_as_ingredient' do
+      it 'return true if unit is volume and recipe has density' do
+        ri = RecipeIngredient.new(quantity: '5 1/2', units: 'cups', recipe_as_ingredient: create(:recipe))
+        expect(ri.can_convert_to_grams?).to be_truthy
+      end
+    end
+
+
+  end
+
 end