Basic trade and holdings view (#1271)

* Add trade view

* Lint fix

* Fix stale placeholder variable

* Add holding view

app/models/account/entry.rb

@@ -109,8 +109,8 @@ class Account::Entry < ApplicationRecord
     def bulk_update!(bulk_update_params)
       bulk_attributes = {
         date: bulk_update_params[:date],
+        notes: bulk_update_params[:notes],
         entryable_attributes: {
-          notes: bulk_update_params[:notes],
           category_id: bulk_update_params[:category_id],
           merchant_id: bulk_update_params[:merchant_id]
         }.compact_blank

app/models/account/holding.rb

@@ -37,6 +37,19 @@ class Account::Holding < ApplicationRecord
     @trend ||= calculate_trend
   end
 
+  def trades
+    account.entries.where(entryable: account.trades.where(security: security)).reverse_chronological
+  end
+
+  def destroy_holding_and_entries!
+    transaction do
+      account.entries.where(entryable: account.trades.where(security: security)).destroy_all
+      destroy
+    end
+
+    account.sync_later
+  end
+
   private
 
     def calculate_trend

app/models/account/trade.rb

@@ -25,4 +25,15 @@ class Account::Trade < ApplicationRecord
   def buy?
     qty > 0
   end
+
+  def unrealized_gain_loss
+    return nil if sell?
+    current_price = security.current_price
+    return nil if current_price.nil?
+
+    current_value = current_price * qty.abs
+    cost_basis = price_money * qty.abs
+
+    TimeSeries::Trend.new(current: current_value, previous: cost_basis)
+  end
 end