Ruby代码美化，多行拆分长指令

Posted 2023-02-21

【中文标题】Ruby代码美化，多行拆分长指令

【英文标题】：Ruby code beautification, split long instructions on multiple lines

【发布时间】：2011-11-13 16:02:23

【问题描述】：

我们如何编写以下语句来提高可读性？

Promotion.joins(:category).where(["lft>=? and rgt<=?", c.lft, c.rgt]).joins(:shops).where(:promotions_per_shops =>  :shop_id => shops_id ).count('id', :distinct => true)

以下内容无法编译

Promotion.joins(:category)
         .where(["lft>=? and rgt<=?", c.lft, c.rgt])
         .joins(:shops)
         .where(:promotions_per_shops =>  :shop_id => shops_id )
         .count('id', :distinct => true)

syntax error, unexpected '.', expecting kEND
                     .where(["lft>=? and rgt<=?", c.lft, c.rgt])

【参考方案1】：

这样做：

Promotion.joins(:category).
         where(["lft>=? and rgt<=?", c.lft, c.rgt]).
         joins(:shops).
         where(:promotions_per_shops =>  :shop_id => shops_id ).
         count('id', :distinct => true)

【参考方案2】：

它应该在 1.9 中编译。在以前的版本中确实是无效的。

【参考方案3】：

也可以这样做

Promotion.joins(:category) \
         .where(["lft>=? and rgt<=?", c.lft, c.rgt]) \
         .joins(:shops) \
         .where(:promotions_per_shops =>  :shop_id => shops_id ) \
         .count('id', :distinct => true)

【讨论】：

“\”这个东西很有帮助！谢谢