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35 lines
1.0 KiB
35 lines
1.0 KiB
5 years ago
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class Admins::DragPortalImageService < ApplicationService
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Error = Class.new(StandardError)
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attr_reader :move, :after
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def initialize(move, after)
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@move = move
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@after = after # 移动后下一个位置的元素
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end
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def call
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return if move.position + 1 == after&.position # 未移动
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images = PortalImage.all
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ActiveRecord::Base.transaction do
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if after.blank? # 移动至末尾
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total = images.count
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images.where('position > ?', move.position).update_all('position = position - 1')
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move.update!(position: total)
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return
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end
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if move.position > after.position # 前移
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images.where('position >= ? AND position < ?', after.position, move.position).update_all('position = position + 1')
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move.update!(position: after.position)
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else # 后移
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images.where('position > ? AND position <= ?', move.position, after.position).update_all('position = position - 1')
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move.update!(position: after.position)
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end
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end
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end
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end
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