stock.rb in iron_warbler-2.0.7.38

- old
+ new

@@ -1,8 +1,11 @@
 include Math
 require 'business_time'
 
+##
+## https://www.macrotrends.net/stocks/charts/META/meta-platforms/stock-price-history
+##
 class Iro::Stock
   include Mongoid::Document
   include Mongoid::Timestamps
   include Mongoid::Paranoia
   store_in collection: 'iro_stocks'
@@ -16,10 +19,12 @@
   field :status, default: STATUS_ACTIVE
 
   field :ticker
   validates :ticker, uniqueness: true, presence: true
   index({ ticker: -1 }, { unique: true })
+  def symbol;    ticker;     end
+  def symbol= a; ticker = a; end
 
   field :last, type: :float
   field :options_price_increment, type: :float
 
   field :stdev, type: :float
@@ -28,10 +33,12 @@
   has_many :strategies, class_name: 'Iro::Strategy', inverse_of: :stock
   has_many :purses,     class_name: 'Iro::Purse',    inverse_of: :stock
   has_many :options,    class_name: 'Iro::Option',   inverse_of: :stock
   has_many :priceitems, inverse_of: :stock
 
+  default_scope { order_by({ ticker: :asc }) }
+
   ## my_find
   def self.f ticker
     self.find_by ticker: ticker
   end
 
@@ -53,11 +60,18 @@
 
   duration = 1.year
   stock.volatility_from_yr
 
 =end
-  def volatility duration:
+  field :volatility, type: :float
+  def volatility duration: 1.year, recompute: false
+    if self[:volatility]
+      if !recompute
+        return self[:volatility]
+      end
+    end
+
     stock = self
     begin_on = Time.now - duration - 1.day
     points = Iro::Datapoint.where( kind: 'STOCK', symbol: stock.ticker,
       :date.gte => begin_on,
     ).order_by( date: :asc )
@@ -84,9 +98,10 @@
     # n_periods = begin_on.to_date.business_days_until( Date.today )
     out = Math.sqrt( sum_of_sq )*sqrt( n )
     adjustment = 2.0
     out = out * adjustment
     puts! out, 'volatility (adjusted)'
+    self.update volatility: out
     return out
   end
 
   def volatility_from_mo
     volatility( duration: 1.month )