我如何在Ruby on Rails中读取文件

Question

I´m new to rails an i try to read a txt.file that looks like this:

ThomasLinde ; PeterParker ; Monday

JulkoAndrovic ; KeludowigFrau ; Tuesday

JohannesWoellenstein ; SiegmundoKrugmando ; Wednesday

Now i want to read each "column" of the .txt file to display it on a page of my application. My idea for the code looks like this:

if (File.exist?("Zuordnung_x.txt"))
   fi=File.open("Zuordnung_x.txt", "r")
   fi.each { |line|
      sa=line.split(";")
      @nanny_name=sa[0]
      @customer_name=sa[1]
      @period_name=sa[2]
   }
   fi.close
else
   @nanny_name=nil
   @customer_name=nil
   @period_name=nil
   flash.now[:not_available] = "Nothing happened!"
end

This is my Idea but he gives me only one line. Any ideas? or i am just able to read one line if i use @nanny_name ?

Answer 1

You can only need a variable with an array value, and push every line to it.

@result = []
if (File.exist?("Zuordnung_x.txt"))
  fi=File.open("Zuordnung_x.txt", "r")
  fi.each do |line|
    sa=line.split(";")
    @result << {nanny_name: sa[0], customer_name: sa[1], period_name: [2]}
  end
  fi.close
else
  flash.now[:not_available] = "Nothing happened!"
end

and on view template, you need to each @result , example

<% @result.each do |row| %>
   <p><%= "#{row[:nanny_name]} serve the customer #{row[:customer_name]} on #{row[:period_name]}"  %><p>
<% end %>

optional :

If just using split , probably you will get some string with whitespace at the beginning of string or at the end of string

"ThomasLinde ; PeterParker ; Monday".split(';')
 => ["ThomasLinde ", " PeterParker ", " Monday"] 

to handle it, you need strip every value of an array like this :

"ThomasLinde ; PeterParker ; Monday".split(';').map(&:strip)
 => ["ThomasLinde", "PeterParker", "Monday"]