Added MealsController#new and form autocomplete for Food

Renamed QuantityColumn -> Exposure

app/models/exposure.rb

@@ -0,0 +1,4 @@
+class Exposure < ActiveRecord::Base
+  belongs_to :view, polymorphic: true
+  belongs_to :quantity
+end

app/models/food.rb

@@ -34,6 +34,9 @@ class Food < ActiveRecord::Base
   validates :ref_amount, numericality: {greater_than: 0}
   validates :group, inclusion: {in: groups.keys}
 
+  scope :visible, -> { where(hidden: false) }
+  scope :hidden, -> { where(hidden: true) }
+
   after_initialize do
     if new_record?
       self.ref_amount ||= 100

app/models/ingredient.rb

@@ -0,0 +1,8 @@
+class Ingredient < ActiveRecord::Base
+  belongs_to :composition, inverse_of: :ingredients, required: true
+  belongs_to :food, required: true
+  belongs_to :part_of, required: false
+
+  validates :ready_ratio, numericality: {greater_than_or_equal_to: 0.0}
+  validates :amount, numericality: {greater_than_or_equal_to: 0.0}
+end

app/models/meal.rb

@@ -1,6 +1,19 @@
 class Meal < ActiveRecord::Base
   belongs_to :project, required: true
 
-  has_many :ingredients, as: :composition, dependent: :destroy
+  has_many :ingredients, as: :composition, dependent: :destroy, validate: true
   has_many :foods, through: :ingredients
+  validates :ingredients, presence: true
+  accepts_nested_attributes_for :ingredients, allow_destroy: true, reject_if: proc { |attrs|
+    attrs['food_id'].blank? && attrs['amount'].blank?
+  }
+  # Ingredient food_id + part_of_id uniqueness validation. Cannot be effectively
+  # checked on Ingredient model level.
+  validate do
+    ingredients = self.ingredients.reject { |i| i.marked_for_destruction? }
+      .map { |i| [i.food_id, i.part_of_id] }
+    if ingredients.length != ingredients.uniq.length
+      errors.add(:ingredients, :duplicated_ingredient)
+    end
+  end
 end

app/models/measurement_routine.rb

@@ -3,9 +3,9 @@ class MeasurementRoutine < ActiveRecord::Base
   has_many :measurements, -> { order "taken_at DESC" }, inverse_of: :routine,
     foreign_key: 'routine_id', dependent: :restrict_with_error,
     extend: BodyTracking::ItemsWithQuantities
-  has_many :readout_columns, as: :column_view, dependent: :destroy,
-    class_name: 'QuantityColumn', extend: BodyTracking::TogglableColumns
-  has_many :quantities, -> { order "lft" }, through: :readout_columns
+  has_many :readout_exposures, as: :view, dependent: :destroy,
+    class_name: 'Exposure', extend: BodyTracking::TogglableColumns
+  has_many :quantities, -> { order "lft" }, through: :readout_exposures
 
   validates :name, presence: true, uniqueness: {scope: :project_id}
 end

app/models/quantity.rb

@@ -9,7 +9,7 @@ class Quantity < ActiveRecord::Base
   belongs_to :project, required: false
   has_many :nutrients, dependent: :restrict_with_error
   has_many :readouts, dependent: :restrict_with_error
-  has_many :columns, dependent: :destroy
+  has_many :exposures, dependent: :destroy
 
   has_one :formula, inverse_of: :quantity, dependent: :destroy, validate: true
   accepts_nested_attributes_for :formula, allow_destroy: true, reject_if: proc { |attrs|

app/models/quantity_column.rb

@@ -1,4 +0,0 @@
-class QuantityColumn < ActiveRecord::Base
-  belongs_to :column_view, polymorphic: true
-  belongs_to :quantity
-end