道喜技术日记 .^. 天天红玉世界. Ruby代码世界：尽可能使用Ruby语言方法”<<“

Ruby代码世界：尽可能使用Ruby语言方法”<<“

由Gudao Luo在2009-01-19 at 09:50发表的

尽可能使用Ruby语言操作方法”<<“

说明
- 下面第一段代码使用了变量“i”。在Ruby代码中，基本上不需要使用这种变量，即使需要也可以使用“each_with_index”。而第一段代码连这种需要也没有。
- 下面第二段代码是使用方法“<<”改进后代码清单。注意使用这种方法时，一定要清楚方法“<<”之后的对象是什么。在Rails 2.2.2版本中因为使用此方法不当，产生了错误。参见： Rails2.2世界：国际化功能问与答（二）。

下面参考链接的部分代码

#rows
  rows=[]
  i=0
  @issues.each do |issue|        
    rows[i] = [issue.id.to_s, issue.tracker.name, issue.status.name,
                     issue.priority.name, issue.assigned_to ? issue.assigned_to.name : '',
                     format_date(issue.updated_on),
                     @project == issue.project ? issue.subject : "#{issue.project.name} - #{issue.subject}"]
    i=i+1
  end

使用方法“<<”改进后代码清单

#rows
  rows=[]
  @issues.each do |issue|        
    rows << [issue.id.to_s, issue.tracker.name, issue.status.name,
                    issue.priority.name, issue.assigned_to ? issue.assigned_to.name : '',
                    format_date(issue.updated_on),
                    @project == issue.project ? issue.subject : "#{issue.project.name} - #{issue.subject}"]
  end

参考链接
- http://www.redmine.org/attachments/1185/prawn.patch

Tags: Rails, Ruby, operator, tricks

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Authors: Gudao Luo

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