英文:
Processing A CSV With Every Line Wrapped In Double Quotes
问题
哦，天哪，我的第一个Stack Overflow问题！我们的一个客户正在向我们发送一个CSV文件进行处理，但他们发送的方式是，每一行都用双引号括起来：
"示例，标题，数值\r\n"
"示例，第一行\r\n"
"示例，第二行\r\n"
...
"等等，等等，等等\r\n"
这反过来导致Ruby将每一行解析为单个字段，包括标题，这导致数据摄入脚本崩溃。
当前的代码将其打开为一个File对象，然后将其传递给具有一些可配置选项的CSV.foreach枚举器：
CSV.foreach(<File Object>, <Options Hash>).with_index(1) do |line, index|
# 处理一条记录
end
有没有一种简单直接的方法告诉Ruby只是忽略这些引号，以便它能正确解析单个字段？
我尝试将CSV选项中的quote_char更改为单引号，但不知何故事情变得更糟了。我可以尝试在处理文件之前从文件中删除这些引号，但这将需要对旧代码进行大量更改，如果可能的话，我想避免这样做。我查看了一些有关CSV选项的文档，但我没有看到明显的解决办法。
供参考，CSV选项配置如下：
{
headers: true,
skip_blanks: true,
encoding: 'bom|utf-8',
liberal_parsing: true,
header_converters: lambda { |f| f.downcase.strip },
row_sep: "\r\n",
quote_char: "'"
}
英文:
Oh boy, my first Stack Overflow question! One of our clients is sending us a CSV file to process, but the way they're sending it, every single line is wrapped in double quotes:
"example, header, values\r\n"
"example, first, line\r\n"
"example, second, line\r\n"
...
"etc, etc, etc\r\n"
This in turn is causing Ruby to parse every line as a single field, including the headers, which is causing this data ingestion script to crash.
The code currently opens this as a File object, which then gets passed to a CSV.foreach enumerator with some configurable options:
CSV.foreach(<File Object>, <Options Hash>).with_index(1) do |line, index|
# process a record
end
Is there a straightforward way to tell Ruby to just ignore these quotes so that it can correctly parse individual fields?
I've tried changing the quote_char in the CSV options to a single quote, but somehow that actually makes things worse. I could probably do all sorts of work to remove these quotes from the file before processing it, but that would require making a bunch of changes to legacy code, and I'd like to avoid it if I can. I've gone through some documentation about CSV options, but I'm not seeing any obvious silver bullet.
For reference, the CSV options are configured as such:
{
headers: true,
skip_blanks: true,
encoding: 'bom|utf-8',
liberal_parsing: true,
header_converters: lambda { |f| f.downcase.strip },
row_sep: "\r\n",
quote_char: "'"
}
答案1
得分: 2
你需要在解析CSV文件之前对文件进行一些"预处理"，如下所示：
#test.csv
"status,color,name\r\n"
"active,green,Norm\r\n"
"inactive,red,Herb"
# test.rb
require 'csv'
not_csv = File.readlines('test.csv')
real_csv = ""
not_csv.each{|line| real_csv += line.sub("\r\n","").gsub('"','') }
parsed_csv = CSV.parse(real_csv, headers: true)
puts parsed_csv[0]["status"] #=> active
puts parsed_csv[1]["name"] #=> Herb
从控制台运行 ruby test.rb。
英文:
You will have to do a little "pre-processing" on the file before parsing the csv. Like this:
#test.csv
"status,color,name\r\n"
"active,green,Norm\r\n"
"inactive,red,Herb"
# test.rb
require 'csv'
not_csv = File.readlines('test.csv')
real_csv = ""
not_csv.each{|line| real_csv += line.sub("\\r\\n","").gsub('"','') }
parsed_csv = CSV.parse(real_csv, headers: true)
puts parsed_csv[0]["status"] #=>active
puts parsed_csv[1]["name"] #=>Herb
from the console run ruby test.rb
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