在迭代Ruby中為數組的每個元素分配對象屬性值

Question

我有一個名為“thing1”的數組和一個名為“Sr”的類，其屬性與“thing1”數組的元素相匹配。 我需要將事物 1 的每個元素分配給 Sr 對象的每個相應屬性。

things1.each_with_index do |line,index|
      if index == 0
          next
      elsif
       array = line.strip.split('|')
       array.each do |attribute|
         # here is where I am stuck !!!!!!!
       end

因為我在 pry 中收到了以下內容

[5] pry(main)> array= l.strip.split('|')
=> ["324184-101003318953",
 "5118 ROBERTSON, HOUSTON TX 77009",
 "HARRIS",
 "H",
 "NEAR NORTHSIDE",
 "0311520000001",
 "NE",
 "NW",
 "FRIDAY",
 "1st Friday",
 "FRIDAY-B",
 "453V",
 "Greater Northside MD",
 "311 HelpLine",
 "311 Call Handling",
 "Unclassified 311 Web Request",
 "311_Seniors",
 "18",
 "Closed",
 "2019-01-01 00:02:10",
 "2019-01-02 09:02:07",
 "2019-01-03 09:34:08",
 "1.02",
 "Other - 324184",
 "-95.35739000000",
 "29.80668000000",
 "29.80654129",
 "-95.35715636",
 "WAP"]
[6] pry(main)> array[0]
=> "324184-101003318953"
[7] pry(main)> array.size
=> 29
Here is the new Sr class attributes that I need to assign each of the 29 elements of the thing1 array
  sr = Sr.new(:case_number => case_number, :sr_location => sr_location, :county => county, :district => district, :neighborhood => neighborhood, :tax_id => tax_id, :trash_quad => trash_quad,:recycle_quad => recycle_quad, :trash_day => trash_day, :heavy_trash_day => heavy_trash_day, :recycle_day => recycle_day, :key_map => key_map,:management_district => management_district, :department => department, :division => division, :sr_type => sr_type, :queue => queue, :sla => sla, :status => status, :sr_create_date => sr_create_date, :due_date => due_date, :date_closed => date_closed, :overdue => overdue, :title => title, :x => x, :y => y, :latitude = latitude, :longitude => longitude, :channel_type => channel_type, :created_at => created_at, :updated_at => updated_at )
  sr.save
     end

Answer 1

csv庫看起來可以在此處用於解析每個元素（按|拆分）並為每個元素分配標頭：

require 'csv'

things1 = ["324184-101003318953|5118 ROBERTSON, HOUSTON TX 77009|HARRIS|H|NEAR NORTHSIDE|0311520000001|NE|NW|FRIDAY|1st Friday|FRIDAY-B|453V|Greater Northside MD|311 HelpLine|311 Call Handling|Unclassified 311 Web Request|311_Seniors|18|Closed|2019-01-01 00:02:10|2019-01-02 09:02:07|2019-01-03 09:34:08|1.02|Other - 324184|-95.35739000000|29.80668000000|29.80654129|-95.35715636|WAP"]

columns = %i[case_number sr_location county district neighborhood tax_id trash_quad recycle_quad trash_day heavy_trash_day recycle_day key_map management_district department division sr_type queue sla status sr_create_date due_date date_closed overdue title x y latitude longitude channel_type created_at updated_at]

things1.each do |line|
  p(**CSV.parse_line(line, headers: columns, col_sep: '|'))
end
# output: {:case_number=>"324184-101003318953", :sr_location=>"5118 ROBERTSON, HOUSTON TX 77009", :county=>"HARRIS", :district=>"H", :neighborhood=>"NEAR NORTHSIDE", :tax_id=>"0311520000001", :trash_quad=>"NE", :recycle_quad=>"NW", :trash_day=>"FRIDAY", :heavy_trash_day=>"1st Friday", :recycle_day=>"FRIDAY-B", :key_map=>"453V", :management_district=>"Greater Northside MD", :department=>"311 HelpLine", :division=>"311 Call Handling", :sr_type=>"Unclassified 311 Web Request", :queue=>"311_Seniors", :sla=>"18", :status=>"Closed", :sr_create_date=>"2019-01-01 00:02:10", :due_date=>"2019-01-02 09:02:07", :date_closed=>"2019-01-03 09:34:08", :overdue=>"1.02", :title=>"Other - 324184", :x=>"-95.35739000000", :y=>"29.80668000000", :latitude=>"29.80654129", :longitude=>"-95.35715636", :channel_type=>"WAP", :created_at=>nil, :updated_at=>nil}

然后，而不是輸出它（ p ），你只需將它傳遞到你的類SR.new(**CSV.parse_line(line, headers: columns, col_sep: '|')) 。

如果things1來自一個文件和第一行（你跳過的index == 0是一個標題行，你可以這樣做：

CSV.foreach('path/to/file.extension', headers: true, col_sep: '|') do |line|
  SR.new(**line)
end

Answer 2

使用Array#zip將鍵壓縮為值。

array = ['foo', 'bar']
keys = %i[num loc]
def fun(hash)
  puts hash.inspect
end

fun(keys.zip(arr).to_h)
#⇒ {:num=>"foo", :loc=>"bar"}

zip返回一個數組，這就是為什么我們需要對其調用to_h將其轉換為哈希。

與您可以將數組壓縮到鍵並將結果散列作為參數傳遞給Sr#new 。