Import CSV from url Errno::ENAMETOOLONG: file name too long - ruby-on-rails

Question

I'm trying to import a CSV file from a url but i'm getting Errno::ENAMETOOLONG: file name too long. I process the file as follow:
require 'open-uri'
url = "http://de65.grepolis.com/data/csv.txt"
url_data = open(url).read()
SmarterCSV.process(url_data, {
...
})
What am i missing ?

Answer 1

You have to pass a filename which should be on server. rightnow you are passing all data . Do something like this
require 'open-uri'
url = "http://de65.grepolis.com/data/csv.txt"
url_data = open(url).read()
File.open('/tmp/file_name', 'w') { |file| file.write(url_data) }
SmarterCSV.process('/tmp/file_name',{ })

Answer 2

I had the same problem using the standard CSV library to pull in a CSV file via an http url. I was able to solve the issue without needing to write to a temporary server file with code like this:
require 'open-uri'
require 'csv'
url = "http://de65.grepolis.com/data/csv.txt"
url_data = open(url).read()
CSV.parse(url_data, headers: true).each do |row|
# per row processing code ...
end

Answer 3

Hope this helps you.
# models/concerns/import.rb
require 'open-uri'
require 'import_error'
module Import
extend ActiveSupport::Concern
class_methods do
def import_remote(url)
csv = CSV.parse(open(url), headers: true)
begin
ActiveRecord::Base.transaction do
counter = 0
csv.each do |row|
row_hash = row.to_hash
begin
instance = self.name.constantize.create!(row_hash)
rescue => e
raise ImportError.new("#{e.message}. at row: #{row_hash}")
end
counter += 1 if instance.persisted?
end
end
rescue => e
return puts e.message
end
puts "Imported #{counter} records"
end
end
end
# lib/tasks/import.rake
namespace :remote_import do
desc "Import companies from CSV"
task :your_model, [:url] do |t, args|
YourModel.import_remote(args.url)
end
end
# lib/import_error.rb
class ImportError < StandardError
end
# models/your_model.rb
class YourModel < ActiveRecord::Base
include Import
end
Gist: https://gist.github.com/victorhazbun87/9ac786961bbf7c235f76