tab/app/models/transaction.rb
2015-09-11 16:35:46 +02:00

55 lines
1.3 KiB
Ruby

# == 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
#
class Transaction < ActiveRecord::Base
belongs_to :debtor, class_name: 'User'
belongs_to :creditor, class_name: 'User'
belongs_to :issuer, polymorphic: true
after_save :recalculate_balances
after_destroy :recalculate_balances
validates :amount, numericality: { greater_than: 0 }
validate :different_debtor_creditor
def peer_of(user)
return creditor if user == debtor
return debtor if user == creditor
end
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
private
def recalculate_balances
creditor.calculate_balance!
debtor.calculate_balance!
end
def different_debtor_creditor
if self.debtor == self.creditor
self.errors.add :base, "Can't write money to yourself"
end
end
end