Added Targets index

app/models/goal.rb

@@ -1,6 +1,10 @@
 class Goal < ActiveRecord::Base
   belongs_to :project, required: true
-  has_many :targets, inverse_of: :goal, dependent: :destroy
+  has_many :targets, -> { order "effective_from DESC" }, inverse_of: :goal,
+    dependent: :destroy, extend: BodyTracking::ItemsWithQuantities
+  has_many :target_exposures, as: :view, dependent: :destroy,
+    class_name: 'Exposure', extend: BodyTracking::TogglableExposures
+  has_many :quantities, -> { order "lft" }, through: :target_exposures
 
   validates :name, presence: true, uniqueness: {scope: :project_id}
 

app/models/target.rb

@@ -16,7 +16,7 @@ class Target < ActiveRecord::Base
   validates :condition, inclusion: {in: CONDITIONS}
   validates :scope, inclusion: {in: [:ingredient, :meal, :day],
                                 if: -> { thresholds.first.quantity.domain == :diet }}
-  validates :effective_from, presence: {unless: :is_binding?}, absence: {if: :is_binding?}
+  validates :effective_from, presence: {if: :is_binding?}, absence: {unless: :is_binding?}
 
   after_initialize do
     if new_record?
@@ -30,4 +30,8 @@ class Target < ActiveRecord::Base
   def arity
     BigDecimal.method(condition).arity
   end
+
+  def to_s
+    "#{condition} #{thresholds.first.value} [#{thresholds.first.unit.shortname}]"
+  end
 end