Схватывающие значения от Hash ruby ​​

Question

бит потерян теперь на этом. Я захватываю данные таблицы от http://www.bbc.co.uk/sport/football/tables, используя nokogiri. Сортировать некоторую помощь от SO, как не был уверен, как захватить некоторые данные, которые я хотел, я был любезно предоставлен с примером чего-то, что они будут делать, который выглядит вот так

require 'open-uri' 
require 'nokogiri' 

url = 'http://www.bbc.co.uk/sport/football/tables' 
doc = Nokogiri::HTML.parse(open url) 
teams = doc.search('tbody tr.team') 

keys = teams.first.search('td').map do |k| 
    k['class'].gsub('-', '_').to_sym 
end 

hsh = teams.flat_map do |team| 
    Hash[keys.zip(team.search('td').map(&:text))] 
end 

puts hsh 

Im немного неясно, с некоторыми из это, я могу видеть, что конечный результат HSH дает этот Hash, например

{:statistics=>"", :position=>"No movement 20", :team_name=>"Reading", :played=>"33", :home_won=>"4", :home_drawn=>"7", :home_lost=>"6", :home_for=>"23", :home_against=>"31", :away_won=>"1", :away_drawn=>"2", :away_lost=>"13", :away_for=>"13", :away_against=>"32", :goal_difference=>"-27", :points=>"24", :last_10_games=>"\n         Draw\nWin\nLoss\nLoss\nLoss\nLoss\nLoss\nLoss\nLoss\nDraw", :status=>"\n     Report of Reading's last match    "} 

{:statistics=>"", :position=>"No movement 19", :team_name=>"QPR", :played=>"33", :home_won=>"2", :home_drawn=>"8", :home_lost=>"6", :home_for=>"12", :home_against=>"23", :away_won=>"2", :away_drawn=>"4", :away_lost=>"11", :away_for=>"17", :away_against=>"31", :goal_difference=>"-25", :points=>"24", :last_10_games=>"\n         Draw\nDraw\nLoss\nLoss\nWin\nWin\nLoss\nLoss\nDraw\nLoss", :status=>"\n     Report of QPR's last match    "} 

Так что мое мышление, что, чтобы захватить каждый: TEAM_NAME я бы пройти через петлю, как я это обычно

hsh.each do |k,v] 
    v['team_name'] 
end 

Итак, это даст мне значение team_name для каждого хэша? Что Im пытаюсь достичь в Extracting elements with Nokogiri, но я хотел бы иметь смысл при условии решения и сохранить каждое значение моей модели

Может кто поможет прояснить некоторое понимание пожалуйста

Благодарности

Answer 1

Это не делает ничего полезного, это только перебирает hsh но ничего не делает, потому что значение, которое вы хотите будет k:

 
hsh.each do |k,v] 
    v['team_name'] 
end 

проблема в том, что hsh действительно представляет собой массив хешей. Сохраняя же имя, hsh, но лечащие его как массив:

hsh.map{ |a| a[:team_name]} 

возвращается:

 
[ 
    [ 0] "Man Utd", 
    [ 1] "Man City", 
    [ 2] "Chelsea", 
    [ 3] "Arsenal", 
    [ 4] "Tottenham", 
    [ 5] "Everton", 
    [ 6] "Liverpool", 
    [ 7] "West Brom", 
    [ 8] "Swansea", 
    [ 9] "Fulham", 
    [10] "West Ham", 
    [11] "Southampton", 
    [12] "Newcastle", 
    [13] "Norwich", 
    [14] "Sunderland", 
    [15] "Stoke", 
    [16] "Aston Villa", 
    [17] "Wigan", 
    [18] "QPR", 
    [19] "Reading" 
] 

Это может быть немного легче визуализировать, если смотреть только на первых двух записей в hsh с использованием hsh[0,2]:

 
[15] (pry) main: 0> hsh[0,2] 
[ 
    [0] { 
      :statistics => "", 
       :position => "No movement 1", 
       :team_name => "Man Utd", 
       :played => "33", 
       :home_won => "14", 
      :home_drawn => "0", 
       :home_lost => "2", 
       :home_for => "40", 
      :home_against => "17", 
       :away_won => "12", 
      :away_drawn => "3", 
       :away_lost => "2", 
       :away_for => "35", 
      :away_against => "18", 
     :goal_difference => "40", 
       :points => "81", 
      :last_10_games => "\n         Win\nWin\nWin\nWin\nWin\nWin\nWin\nLoss\nWin\nDraw", 
       :status => "\n     Report of Man Utd's last match    " 
    }, 
    [1] { 
      :statistics => "", 
       :position => "No movement 2", 
       :team_name => "Man City", 
       :played => "32", 
       :home_won => "12", 
      :home_drawn => "3", 
       :home_lost => "1", 
       :home_for => "36", 
      :home_against => "11", 
       :away_won => "8", 
      :away_drawn => "5", 
       :away_lost => "3", 
       :away_for => "22", 
      :away_against => "16", 
     :goal_difference => "31", 
       :points => "68", 
      :last_10_games => "\n         Win\nDraw\nDraw\nLoss\nWin\nWin\nLoss\nWin\nWin\nWin", 
       :status => "\n     Report of Man City's last match    " 
    } 
] 

---

я не совсем понимаю, как мы получили возвращенный хэш

Вы получили массив хэшей, потому что:

Hash[keys.zip(team.search('td').map(&:text))] 

принуждают массив пар ключ/значение в хэш. У вас есть массив пар ключ/значение, потому что keys.zip(team.search('td').map(&:text)) interweaves keys и результаты team.search('td').map(&:text).

---

так, чтобы сохранить каждое имя команды в модели, может я теперь итерации через цикл?

File.open('team_names.txt', 'w') do |fo| 
    fo.puts hsh.map{ |a| a[:team_name] } 
end 

Это может выглядеть hsh.map{ |a| a[:team_name] }.map(&:to_s) необходимо, но puts будет делать to_s на каждый элемент в возвращаемом массиве автоматически, автоматическое преобразование символов обратно в строки для вас.

---

, если я хочу, чтобы наметить сказать TEAM_NAME и положение, так что я должен создать раздельные звонки, то есть карта на каждое значение? Я не могу отобразить несколько значений в одном вызове?

Это создаст массив массивов:

ary_of_arys = hsh.map{ |a| [ a[:team_name], a[:position] ] } 

Это будет присоединяться все внутренние массивы для каждой строки, а затем распечатать строки:

File.open('team_names.txt', 'w') do |fo| 
    fo.puts hsh.map{ |a| [ a[:team_name], a[:position] ].join(', ') } 
end 

Answer 2

require 'open-uri' 
require 'nokogiri' 

url = 'http://www.bbc.co.uk/sport/football/tables' 
doc = Nokogiri::HTML.parse(open url) 
teams = doc.search('tbody tr.team') 

keys = teams.first.search('td').map do |k| 
    k['class'].gsub('-', '_').to_sym 
end 

hsh = teams.flat_map do |team| 
    Hash[keys.zip(team.search('td').map(&:text))] 
end 
hsh.each do |x| 
    p x[:team_name] 
end 

Выход:

"Man Utd" 
"Man City" 
"Chelsea" 
"Arsenal" 
"Tottenham" 
"Everton" 
"Liverpool" 
"West Brom" 
"Swansea" 
"Fulham" 
"West Ham" 
"Southampton" 
"Newcastle" 
"Norwich" 
"Sunderland" 
"Stoke" 
"Aston Villa" 
"Wigan" 
"QPR" 
"Reading" 

EDIT:

puts hsh 

{:statistics=>"", :position=>"No movement 1", :team_name=>"Man Utd", :played=>"33", :home_won=>"14", :home_drawn=>"0", :home_lost=>"2", :home_for=>"40", :home_against=>"17", :away_won=>"12", :away_drawn=>"3", :away_lost=>"2", :away_for=>"35", :away_against=>"18", :goal_difference=>"40", :points=>"81", :last_10_games=>"\n         Win\nWin\nWin\nWin\nWin\nWin\nWin\nLoss\nWin\nDraw", :status=>"\n     Report of Man Utd's last match    "} 
{:statistics=>"", :position=>"No movement 2", :team_name=>"Man City", :played=>"32", :home_won=>"12", :home_drawn=>"3", :home_lost=>"1", :home_for=>"36", :home_against=>"11", :away_won=>"8", :away_drawn=>"5", :away_lost=>"3", :away_for=>"22", :away_against=>"16", :goal_difference=>"31", :points=>"68", :last_10_games=>"\n         Win\nDraw\nDraw\nLoss\nWin\nWin\nLoss\nWin\nWin\nWin", :status=>"\n     Report of Man City's last match    "} 
{:statistics=>"", :position=>"Moving up 3", :team_name=>"Chelsea", :played=>"32", :home_won=>"10", :home_drawn=>"4", :home_lost=>"2", :home_for=>"35", :home_against=>"13", :away_won=>"8", :away_drawn=>"3", :away_lost=>"5", :away_for=>"29", :away_against=>"20", :goal_difference=>"31", :points=>"61", :last_10_games=>"\n         Win\nDraw\nLoss\nWin\nLoss\nWin\nWin\nLoss\nWin\nWin", :status=>"\n     Report of Chelsea's last match    "} 
{:statistics=>"", :position=>"Moving down 4", :team_name=>"Arsenal", :played=>"33", :home_won=>"10", :home_drawn=>"4", :home_lost=>"3", :home_for=>"42", :home_against=>"21", :away_won=>"7", :away_drawn=>"5", :away_lost=>"4", :away_for=>"22", :away_against=>"14", :goal_difference=>"29", :points=>"60", :last_10_games=>"\n         Draw\nWin\nWin\nWin\nLoss\nWin\nWin\nWin\nWin\nDraw", :status=>"\n     Report of Arsenal's last match    "} 
{:statistics=>"", :position=>"No movement 5", :team_name=>"Tottenham", :played=>"32", :home_won=>"8", :home_drawn=>"5", :home_lost=>"3", :home_for=>"24", :home_against=>"17", :away_won=>"9", :away_drawn=>"2", :away_lost=>"5", :away_for=>"31", :away_against=>"23", :goal_difference=>"15", :points=>"58", :last_10_games=>"\n         Draw\nDraw\nWin\nWin\nWin\nWin\nLoss\nLoss\nWin\nDraw", :status=>"\n     Report of Tottenham's last match    "} 
{:statistics=>"", :position=>"No movement 6", :team_name=>"Everton", :played=>"33", :home_won=>"10", :home_drawn=>"6", :home_lost=>"1", :home_for=>"30", :home_against=>"17", :away_won=>"4", :away_drawn=>"8", :away_lost=>"4", :away_for=>"21", :away_against=>"20", :goal_difference=>"14", :points=>"56", :last_10_games=>"\n         Win\nDraw\nLoss\nLoss\nWin\nWin\nWin\nDraw\nWin\nDraw", :status=>"\n     Report of Everton's last match    "} 
{:statistics=>"", :position=>"No movement 7", :team_name=>"Liverpool", :played=>"33", :home_won=>"8", :home_drawn=>"4", :home_lost=>"4", :home_for=>"30", :home_against=>"14", :away_won=>"5", :away_drawn=>"7", :away_lost=>"5", :away_for=>"29", :away_against=>"26", :goal_difference=>"19", :points=>"50", :last_10_games=>"\n         Draw\nDraw\nLoss\nWin\nWin\nWin\nLoss\nWin\nDraw\nDraw", :status=>"\n     Report of Liverpool's last match    "} 
{:statistics=>"", :position=>"No movement 8", :team_name=>"West Brom", :played=>"32", :home_won=>"9", :home_drawn=>"2", :home_lost=>"5", :home_for=>"24", :home_against=>"16", :away_won=>"4", :away_drawn=>"3", :away_lost=>"9", :away_for=>"18", :away_against=>"27", :goal_difference=>"-1", :points=>"44", :last_10_games=>"\n         Draw\nLoss\nLoss\nWin\nWin\nLoss\nWin\nDraw\nLoss\nLoss", :status=>"\n     Report of West Brom's last match    "} 
{:statistics=>"", :position=>"No movement 9", :team_name=>"Swansea", :played=>"32", :home_won=>"6", :home_drawn=>"6", :home_lost=>"4", :home_for=>"28", :home_against=>"23", :away_won=>"4", :away_drawn=>"5", :away_lost=>"7", :away_for=>"15", :away_against=>"19", :goal_difference=>"1", :points=>"41", :last_10_games=>"\n         Win\nDraw\nLoss\nWin\nLoss\nWin\nLoss\nLoss\nLoss\nDraw", :status=>"\n     Report of Swansea's last match    "} 
{:statistics=>"", :position=>"No movement 10", :team_name=>"Fulham", :played=>"33", :home_won=>"7", :home_drawn=>"3", :home_lost=>"6", :home_for=>"25", :home_against=>"22", :away_won=>"3", :away_drawn=>"7", :away_lost=>"7", :away_for=>"19", :away_against=>"29", :goal_difference=>"-7", :points=>"40", :last_10_games=>"\n         Win\nLoss\nDraw\nWin\nDraw\nWin\nWin\nLoss\nDraw\nLoss", :status=>"\n     Report of Fulham's last match    "} 
{:statistics=>"", :position=>"Moving up 11", :team_name=>"West Ham", :played=>"33", :home_won=>"7", :home_drawn=>"5", :home_lost=>"4", :home_for=>"28", :home_against=>"20", :away_won=>"3", :away_drawn=>"4", :away_lost=>"10", :away_for=>"10", :away_against=>"27", :goal_difference=>"-9", :points=>"39", :last_10_games=>"\n         Loss\nWin\nLoss\nLoss\nWin\nLoss\nWin\nDraw\nDraw\nDraw", :status=>"\n     Report of West Ham's last match    "} 
{:statistics=>"", :position=>"Moving down 12", :team_name=>"Southampton", :played=>"33", :home_won=>"6", :home_drawn=>"6", :home_lost=>"5", :home_for=>"25", :home_against=>"20", :away_won=>"3", :away_drawn=>"5", :away_lost=>"8", :away_for=>"22", :away_against=>"34", :goal_difference=>"-7", :points=>"38", :last_10_games=>"\n         Loss\nDraw\nWin\nLoss\nLoss\nDraw\nWin\nWin\nWin\nDraw", :status=>"\n     Report of Southampton's last match    "} 
{:statistics=>"", :position=>"No movement 13", :team_name=>"Newcastle", :played=>"33", :home_won=>"9", :home_drawn=>"1", :home_lost=>"7", :home_for=>"24", :home_against=>"24", :away_won=>"1", :away_drawn=>"5", :away_lost=>"10", :away_for=>"18", :away_against=>"35", :goal_difference=>"-17", :points=>"36", :last_10_games=>"\n         Win\nWin\nLoss\nWin\nLoss\nWin\nLoss\nLoss\nWin\nLoss", :status=>"\n     Report of Newcastle's last match    "} 
{:statistics=>"", :position=>"No movement 14", :team_name=>"Norwich", :played=>"33", :home_won=>"6", :home_drawn=>"7", :home_lost=>"3", :home_for=>"18", :home_against=>"17", :away_won=>"1", :away_drawn=>"7", :away_lost=>"9", :away_for=>"13", :away_against=>"35", :goal_difference=>"-21", :points=>"35", :last_10_games=>"\n         Draw\nDraw\nDraw\nWin\nLoss\nDraw\nDraw\nLoss\nDraw\nLoss", :status=>"\n     Report of Norwich's last match    "} 
{:statistics=>"", :position=>"No movement 15", :team_name=>"Sunderland", :played=>"33", :home_won=>"4", :home_drawn=>"6", :home_lost=>"6", :home_for=>"17", :home_against=>"17", :away_won=>"4", :away_drawn=>"4", :away_lost=>"9", :away_for=>"20", :away_against=>"28", :goal_difference=>"-8", :points=>"34", :last_10_games=>"\n         Draw\nLoss\nLoss\nLoss\nDraw\nLoss\nDraw\nLoss\nLoss\nWin", :status=>"\n     Report of Sunderland's last match    "} 
{:statistics=>"", :position=>"No movement 16", :team_name=>"Stoke", :played=>"33", :home_won=>"6", :home_drawn=>"7", :home_lost=>"4", :home_for=>"19", :home_against=>"20", :away_won=>"1", :away_drawn=>"6", :away_lost=>"9", :away_for=>"9", :away_against=>"21", :goal_difference=>"-13", :points=>"34", :last_10_games=>"\n         Draw\nLoss\nWin\nLoss\nLoss\nLoss\nDraw\nLoss\nLoss\nLoss", :status=>"\n     Report of Stoke's last match    "} 
{:statistics=>"", :position=>"No movement 17", :team_name=>"Aston Villa", :played=>"33", :home_won=>"4", :home_drawn=>"5", :home_lost=>"8", :home_for=>"16", :home_against=>"25", :away_won=>"4", :away_drawn=>"5", :away_lost=>"7", :away_for=>"20", :away_against=>"35", :goal_difference=>"-24", :points=>"34", :last_10_games=>"\n         Loss\nDraw\nWin\nLoss\nLoss\nWin\nWin\nLoss\nWin\nDraw", :status=>"\n     Report of Aston Villa's last match    "} 
{:statistics=>"", :position=>"No movement 18", :team_name=>"Wigan", :played=>"32", :home_won=>"4", :home_drawn=>"4", :home_lost=>"8", :home_for=>"20", :home_against=>"32", :away_won=>"4", :away_drawn=>"3", :away_lost=>"9", :away_for=>"17", :away_against=>"26", :goal_difference=>"-21", :points=>"31", :last_10_games=>"\n         Loss\nDraw\nDraw\nLoss\nWin\nLoss\nWin\nWin\nDraw\nLoss", :status=>"\n     Report of Wigan's last match    "} 
{:statistics=>"", :position=>"No movement 19", :team_name=>"QPR", :played=>"33", :home_won=>"2", :home_drawn=>"8", :home_lost=>"6", :home_for=>"12", :home_against=>"23", :away_won=>"2", :away_drawn=>"4", :away_lost=>"11", :away_for=>"17", :away_against=>"31", :goal_difference=>"-25", :points=>"24", :last_10_games=>"\n         Draw\nDraw\nLoss\nLoss\nWin\nWin\nLoss\nLoss\nDraw\nLoss", :status=>"\n     Report of QPR's last match    "} 
{:statistics=>"", :position=>"No movement 20", :team_name=>"Reading", :played=>"33", :home_won=>"4", :home_drawn=>"7", :home_lost=>"6", :home_for=>"23", :home_against=>"31", :away_won=>"1", :away_drawn=>"2", :away_lost=>"13", :away_for=>"13", :away_against=>"32", :goal_difference=>"-27", :points=>"24", :last_10_games=>"\n         Draw\nWin\nLoss\nLoss\nLoss\nLoss\nLoss\nLoss\nLoss\nDraw", :status=>"\n     Report of Reading's last match    "}