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
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# issuer_id :integer not null
# issuer_type :string not null
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# amount :integer default(0), not null
# message :string
# created_at :datetime not null
# updated_at :datetime not null
#
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class Transaction < ActiveRecord::Base
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belongs_to :debtor, class_name: 'User'
belongs_to :creditor, class_name: 'User'
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belongs_to :issuer, polymorphic: true
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after_save :recalculate_balances
after_destroy :recalculate_balances
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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
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private
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def recalculate_balances
creditor.calculate_balance!
debtor.calculate_balance!
end
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def different_debtor_creditor
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if self.debtor == self.creditor
self.errors.add :base, "Can't write money to yourself"
end
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end
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end