27 lines
840 B
Ruby
27 lines
840 B
Ruby
class Unit < ApplicationRecord
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attribute :multiplier, default: 1
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belongs_to :user, optional: true
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belongs_to :base, optional: true, class_name: "Unit"
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validates :symbol, presence: true, uniqueness: {scope: :user_id}
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validates :multiplier, numericality: {equal_to: 1}, unless: :base
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validates :multiplier, numericality: {other_than: 1}, if: :base
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validate if: -> { base.present? } do
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errors.add(:base, :only_top_level_base_units) unless base.base.nil?
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end
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acts_as_nested_set parent_column: :base_id, scope: :user, dependent: :destroy, order_column: :multiplier
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scope :defaults, -> { where(user: nil) }
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after_save if: :base do |record|
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record.move_to_ordered_child_of(record.base, :multiplier)
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end
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before_destroy do
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# TODO: disallow destruction if any object depends on this unit
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nil
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end
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end
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