Apply experience deduction logic to money

app/assets/javascripts/backbone/models/user.js.coffee

@@ -14,9 +14,15 @@ class HabitTracker.Models.User extends Backbone.Model
       @set({ exp: @get('exp') - @tnl() })
       @set({ lvl: @get('lvl') + 1 })
     
-    # also add money. Only take away money if it was a mistake (aka, a checkbox) 
-    if delta>0 or (habit.isDaily() or habit.isTodo()) 
-      @set({money: @get('money')+delta})
+    # @deprecated also add money. Only take away money if it was a mistake (aka, a checkbox) 
+    # if delta>0 or (habit.isDaily() or habit.isTodo()) 
+      # @set({money: @get('money')+delta})
+      
+    # apply same logic to money
+    @set({money: @get('money')+delta})
+    if @get('money') < 0 then @set({money: 0})
+      
+      
     # if buying an item, deduct cost
     if habit.isReward()
       @set({money: @get('money')-habit.get('score')})

app/models/habit.rb

@@ -19,6 +19,7 @@ class Habit < ActiveRecord::Base
         # but not for Todos (just increase todo's value)
         if(h.habit_type==2)
           h.user.exp += value
+          h.user.money += value
           h.user.save
         end
         h.score += value

app/models/user.rb

@@ -14,6 +14,9 @@ class User < ActiveRecord::Base
   before_save :calculate_experience
   
   def calculate_experience
+    
+    self.money = 0 if self.money < 0
+    
     self.exp = 0 if self.exp < 0
     if (self.exp > self.tnl)
       self.exp -= self.tnl # carry over