tab/app/models/transaction.rb

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# == Schema Information
#
# Table name: transactions
#
# id :integer not null, primary key
# debtor_id :integer not null
# creditor_id :integer not null
# issuer_id :integer not null
# issuer_type :string not null
# amount :integer default(0), not null
# message :string
# created_at :datetime not null
# updated_at :datetime not null
# id_at_client :integer
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#
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class Transaction < ActiveRecord::Base
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include BaseTransaction
include TransactionHelpers
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after_save :recalculate_balances!
after_destroy :recalculate_balances!
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validates :id_at_client, presence: true, uniqueness: { scope: :issuer_id }, if: :is_client_transaction?
def signed_amount_for(user)
return -amount if user == debtor
return amount if user == creditor
end
def reverse
self.creditor, self.debtor = self.debtor, self.creditor
self.amount *= -1
end
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private
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def recalculate_balances!
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creditor.calculate_balance!
debtor.calculate_balance!
end
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end