forked from fixin.me/fixin.me
55 lines
1.9 KiB
Ruby
55 lines
1.9 KiB
Ruby
class Unit < ApplicationRecord
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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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has_many :subunits, class_name: "Unit", dependent: :restrict_with_error, inverse_of: :base
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validate if: ->{ base.present? } do
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errors.add(:base, :user_mismatch) unless user == base.user
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errors.add(:base, :multilevel_nesting) if base.base.present?
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end
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validates :symbol, presence: true, uniqueness: {scope: :user_id},
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length: {maximum: columns_hash['symbol'].limit}
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validates :name, length: {maximum: columns_hash['name'].limit}
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validates :multiplier, numericality: {equal_to: 1}, unless: :base
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validates :multiplier, numericality: {other_than: 0}, if: :base
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scope :defaults, ->{ where(user: nil) }
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scope :with_defaults, ->{ self.or(Unit.where(user: nil)) }
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scope :defaults_diff, ->{
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other_units = Unit.arel_table.alias('other_units')
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other_bases_units = Unit.arel_table.alias('other_bases_units')
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constraints = other_bases_units[:id].eq(other_units[:base_id])
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.and(other_bases_units[:symbol].eq(Arel::Table.new(:bases_units)[:symbol]))
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.and(other_units[:symbol].eq(arel_table[:symbol]))
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.and(other_units[:user_id].not_eq(arel_table[:user_id]))
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with_defaults
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.joins(
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arel_table.create_join(
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arel_table.grouping([other_units, other_bases_units]),
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arel_table.create_on(constraints),
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Arel::Nodes::OuterJoin
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).to_sql
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)
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.where({other_units: {id: nil}})
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}
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scope :ordered, ->{
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left_outer_joins(:base)
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.order(arel_table.coalesce(Arel::Table.new(:bases_units)[:symbol], arel_table[:symbol]),
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arel_table[:base_id].asc.nulls_first, :multiplier, :symbol)
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}
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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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def movable?
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subunits.empty?
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end
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def default?
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user.nil?
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end
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end
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