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Introduce new patterns for direct sql that are safe and fast. MiniSql is not prone to memory bloat that can happen with direct PG usage. It also has an extremely fast materializer and very a convenient API - DB.exec(sql, *params) => runs sql returns row count - DB.query(sql, *params) => runs sql returns usable objects (not a hash) - DB.query_hash(sql, *params) => runs sql returns an array of hashes - DB.query_single(sql, *params) => runs sql and returns a flat one dimensional array - DB.build(sql) => returns a sql builder See more at: https://github.com/discourse/mini_sql
37 lines
979 B
Ruby
37 lines
979 B
Ruby
module Positionable
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extend ActiveSupport::Concern
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included do
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before_save do
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self.position ||= self.class.count
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end
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end
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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? || position > (self.position)
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DB.exec "
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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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DB.exec "
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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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DB.exec "
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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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end
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