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list.rb 764 Bytes
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class List < ActiveRecord::Base
  belongs_to :board
  belongs_to :label

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  enum list_type: { backlog: 0, label: 1, done: 2 }
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  validates :board, :list_type, presence: true
  validates :label, :position, presence: true, if: :label?
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  validates :label_id, uniqueness: { scope: :board_id }, if: :label?
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  validates :position, numericality: { only_integer: true, greater_than_or_equal_to: 0 }, if: :label?
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  before_destroy :can_be_destroyed

  scope :destroyable, -> { where(list_type: list_types[:label]) }
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  scope :movable, -> { where(list_type: list_types[:label]) }
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  def destroyable?
    label?
  end
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  def movable?
    label?
  end

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  def title
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    label? ? label.name : list_type.humanize
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  end
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  private

  def can_be_destroyed
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    destroyable?
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  end
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end