Initial commit

app/models/transfer.rb

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+# encoding: UTF-8
+# frozen_string_literal: true
+
+class Transfer < ApplicationRecord
+
+  # == Constants ============================================================
+
+  extend Enumerize
+
+  CATEGORIES = %w[wire refund purchases commission airdrop].freeze
+  CATEGORIES_MAPPING = { wire: 1, refund: 2, purchases: 3, commission: 4, airdrop: 5 }.freeze
+
+  # == Attributes ===========================================================
+
+  enumerize :category, in: CATEGORIES_MAPPING, scope: true
+
+  # == Extensions ===========================================================
+
+  # == Relationships ========================================================
+
+  # Define has_many relation with Operations::{Asset,Expense,Liability,Revenue}.
+  ::Operations::Account::TYPES.map(&:pluralize).each do |op_t|
+    has_many op_t.to_sym,
+             class_name: "::Operations::#{op_t.to_s.singularize.camelize}",
+             as: :reference
+  end
+
+  # == Validations ==========================================================
+
+  validates :key, uniqueness: true, presence: true
+  validates :category, presence: true
+  validate do
+    errors.add(:base, 'invalidates accounting equation') unless Operations.validate_accounting_equation(operations)
+  end
+
+  # == Scopes ===============================================================
+
+  # == Callbacks ============================================================
+
+  before_create { self.key = self.key.strip.downcase }
+  before_commit on: :create do
+    update_legacy_balances
+  end
+
+  # == Class Methods ========================================================
+
+  # == Instance Methods =====================================================
+
+  def update_legacy_balances
+    liabilities.where.not(member_id: nil).find_each { |l| Operations.update_legacy_balance(l) }
+  end
+
+  def operations
+    assets + liabilities + revenues + expenses
+  end
+end
+
+# == Schema Information
+# Schema version: 20190905050444
+#
+# Table name: transfers
+#
+#  id          :integer          not null, primary key
+#  key         :string(30)       not null
+#  category    :integer          not null
+#  description :string(255)      default("")
+#  created_at  :datetime         not null
+#  updated_at  :datetime         not null
+#
+# Indexes
+#
+#  index_transfers_on_key  (key) UNIQUE
+#