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64 lines
1.5 KiB
Ruby
64 lines
1.5 KiB
Ruby
class Account::Holding < ApplicationRecord
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include Monetizable
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monetize :amount
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belongs_to :account
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belongs_to :security
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validates :qty, :currency, presence: true
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scope :chronological, -> { order(:date) }
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scope :current, -> { where(date: Date.current).order(amount: :desc) }
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scope :in_period, ->(period) { period.date_range.nil? ? all : where(date: period.date_range) }
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scope :known_value, -> { where.not(amount: nil) }
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scope :for, ->(security) { where(security_id: security).order(:date) }
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delegate :ticker, to: :security
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def name
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security.name || ticker
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end
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def weight
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return nil unless amount
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portfolio_value = account.holdings.current.known_value.sum(&:amount)
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portfolio_value.zero? ? 1 : amount / portfolio_value * 100
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end
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# Basic approximation of cost-basis
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def avg_cost
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avg_cost = account.holdings.for(security).where("date <= ?", date).average(:price)
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Money.new(avg_cost, currency)
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end
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def trend
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@trend ||= calculate_trend
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end
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def trades
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account.entries.where(entryable: account.trades.where(security: security)).reverse_chronological
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end
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def destroy_holding_and_entries!
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transaction do
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account.entries.where(entryable: account.trades.where(security: security)).destroy_all
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destroy
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end
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account.sync_later
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end
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private
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def calculate_trend
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return nil unless amount_money
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start_amount = qty * avg_cost
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TimeSeries::Trend.new \
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current: amount_money,
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previous: start_amount
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end
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end
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