Ruby on rails rails-显示文本字段中的字符数

我正在运行一个rails项目，并且我正在显示一个文本字段，该字段通常可能太长。如果我可以调用任何东西在查看页面上仅显示20个单词或120个字符？？？

您可能对TextHelper的功能感兴趣：

  truncate("Once upon a time in a world far far away")
  # => Once upon a time in a world f...

  truncate("Once upon a time in a world far far away", :length => 14)
  # => Once upon a...

  truncate("And they found that many people were sleeping better.", :length => 25, "(clipped)")
  # => And they found that many (clipped)

  truncate("And they found that many people were sleeping better.", :omission => "... (continued)", :length => 15)
  # => And they found... (continued)

你也可以看到这个例子

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在ruby中，您还可以为字符串指定一个范围。mystring[0..119]

'Once upon a time in a world far far away'.truncate(27)
"Once upon a time in a wo..."

'Once upon a time in a world far far away'.truncate(27, separator: ' ')
"Once upon a time in a..."

'Once upon a time in a world far far away'.truncate(27, separator: /\s/)
"Once upon a time in a..."

'And they found that many people were sleeping better.'.truncate(25, omission: '... (continued)')
"And they f... (continued)"