38 lines
1.0 KiB
Ruby
38 lines
1.0 KiB
Ruby
module Positionable
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extend ActiveSupport::Concern
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def move_to(position_arg)
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position = [[position_arg, 0].max, self.class.count - 1].min
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if self.position.nil? or position > self.position
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self.exec_sql "
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UPDATE #{self.class.table_name}
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SET position = position - 1
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WHERE position > :current_position and position <= :new_position",
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{current_position: self.position, new_position: position}
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elsif position < self.position
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self.exec_sql "
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UPDATE #{self.class.table_name}
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SET position = position + 1
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WHERE position >= :new_position and position < :current_position",
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{current_position: self.position, new_position: position}
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else
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# Not moving to a new position
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return
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end
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self.exec_sql "
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UPDATE #{self.class.table_name}
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SET position = :position
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WHERE id = :id", {id: id, position: position}
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end
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def use_default_position
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self.exec_sql "
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UPDATE #{self.class.table_name}
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SET POSITION = null
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WHERE id = :id", {id: id}
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end
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end
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