使用content_tag时，Ruby on Rails中的html表奇怪呈现(Odd rendering of an html table in Ruby on Rails when using content_tag)

 如果没有显式调用返回，Ruby Rails将返回它使用的最后一个变量。 （例如:) 
 
def some_method(*args)
  a = 12
  b = "Testing a String"
  # ...
  3
end # This method will return the Integer 3 because it was the last "thing" used in the method
 
 使用数组返回所有content_tag（ 警告 ：此方法将返回一个数组，而不是您期望的content_tag，您需要循环它）： 
 
def itemSemanticDifferential(method, options = {})

  results = []

  if options[:surveyQuestion].any? then
    results << @template.content_tag(:tr) do
      @template.content_tag(:td, options[:surveyQuestion], :colspan => 3)
    end
  end

   results << @template.content_tag(:tr) do
    @template.content_tag(:th, options[:argument0])
  end

  return results # you don't actually need the return word here, but it makes it more readable
end
 
 正如问题的作者所说，你需要循环结果，因为它是一个content_tags数组。 此外，您需要使用.html_safe将content_tags输出为HTML（而不是字符串）。 
 
<% f.itemSemanticDifferential(:method, options = {}).each do |row| %>
  <%= row.html_safe %>
<% end %>

Ruby Rails returns the last variable it used if no return is explicitly called. ( example: )
 
def some_method(*args)
  a = 12
  b = "Testing a String"
  # ...
  3
end # This method will return the Integer 3 because it was the last "thing" used in the method
 
Use an Array to return all the content_tag (WARNING: this method will return an Array, not a content_tag as you expect, you'll need to loop on it):
 
def itemSemanticDifferential(method, options = {})

  results = []

  if options[:surveyQuestion].any? then
    results << @template.content_tag(:tr) do
      @template.content_tag(:td, options[:surveyQuestion], :colspan => 3)
    end
  end

   results << @template.content_tag(:tr) do
    @template.content_tag(:th, options[:argument0])
  end

  return results # you don't actually need the return word here, but it makes it more readable
end
 
As asked by author of the Question, You need to loop on the result because it is an array of content_tags. Also, you need to use .html_safe to output the content_tags as HTML (not strings).
 
<% f.itemSemanticDifferential(:method, options = {}).each do |row| %>
  <%= row.html_safe %>
<% end %>