How do I iterate through all records and pass database value to a variable?

问题

I have two tables, "Que" and "Opts".

I want to iterate through all the records in Que and add them to the variables rikt_nr, start_nr and end_nr, because they will go on the end of a URL, which will look like:

api.url.number=8-00001

How do I make it iterate through Que and pass rikt_nr, start_nr and end_nr to the rest of the code?

The Que table has these fields:

create_table "ques", force: true do |t|
  t.integer  "rikt_nr"
  t.integer  "start_nr"
  t.integer  "end_nr"
  t.datetime "created_at"
  t.datetime "updated_at"
end

and Opts has these fields:

create_table "opts", force: true do |t|
  t.string   "numbers"
  t.string   "operator"
  t.datetime "created_at"
  t.datetime "updated_at"
end

This is the code:

Que.all.each do | que |

  url = "http://api.url.number=" 

  que.rikt_nr = rikt_nr 
  que.start_nr = start_nr  
  que.end_nr = end_nr  
  st_en = start_nr..end_nr 

  st_en.each do |nr| 
    full_url = "#{url}" + rikt_nr.to_s + "-"+ nr.to_s

    doc = Nokogiri::XML(open(full_url)) 

    number = doc.at('Number').text  
    operator = doc.at('Name').text 

    number_operator = "#{number}" + ";" + " #{operator}"

    number_operator 

    save = @opts.create(:numbers => number, :operator => operator) 
  end
end

回答1:

I just found out this.

The problem was here:

que.rikt_nr = rikt_nr 
que.start_nr = start_nr  
que.end_nr = end_nr  
st_en = start_nr..end_nr

so I changed it to:

Que.all.each do | que |

  url = "http://api.url.number=" 

  st_en = que.start_nr..que.end_nr 

  st_en.each do |nr| 
    full_url = "#{url}" + que.rikt_nr.to_s + "-"+ nr.to_s

    doc = Nokogiri::XML(open(full_url)) 

    number = doc.at('Number').text  
    operator = doc.at('Name').text 

    number_operator = "#{number}" + ";" + " #{operator}"

    number_operator 

    save = @opts.create(:numbers => number, :operator => operator) 

  end
end

and it now works.

来源：https://stackoverflow.com/questions/26389455/how-do-i-iterate-through-all-records-and-pass-database-value-to-a-variable

标签

ruby-on-rails

ruby

database

nokogiri