How can I import a CSV file via a rake task?

Question

I know this question has been asked a lot on this forum but I\'m under a strict deadline and I need some help, so any advice is much appreciated. I\'m new to Ruby on Rails

Answer 1

I worked on this for hours and hours one day. I finally got it to work by doing the following:

1. Added a header in the first row to my csv file that reflected the attr_accessible in my model. In my case my model was attr_accessible :intro, :name and in my csv file the first line read name, intro.
2. Created a custom rake file. I named mine import.rake and placed it in the lib/tasks folder. Place this code in that file:

#lib/tasks/import.rake
require 'csv'
desc "Imports a CSV file into an ActiveRecord table"
task :import, [:filename] => :environment do    
    CSV.foreach('myfile.csv', :headers => true) do |row|
      MyModel.create!(row.to_hash)
    end
end

Then type bundle exec rake import into the command line.

To get this to work I had quite SQLite Database Browser. I hope that helps someone!

Answer 2

Here is an example CSV that I imported using rake db:seed. I wrote this into the seeds.rb file and put the CSV file into /public/seed_data/zip_code.csv. It's pretty self explanatory (i.e., the csv has three columns: code, long. and lat.

The code parses each line, extracts the pertinent data and assigns it to a local variable then writes it to a record. Hope it helps.

File.open("#{Rails.root}/public/seed_data/zip_code.csv") do |zip_codes|
  zip_codes.read.each_line do |zip_code|
    code, longitude, latitude = zip_code.chomp.split(",")
    #  to remove the quotes from the csv text:
    code.gsub!(/\A"|"\Z/, '')
    # to create each record in the database
    ZipCodeGeo.create!(:zip_code => code, :longitude => longitude, :latitude =>      latitude)             
  end
end

Answer 3

You can read your csv file using CSV module of rails and can create records. Here is detailed help: Populate db using csv

Answer 4

under your project folder in lib/task create a rake file say "import_incidents_csv.rake"

follow this Ruby on Rails - Import Data from a CSV file

in rake file have following code

require 'csv'
namespace :import_incidents_csv do
  task :create_incidents => :environment do
    "code from the link"  
  end
end 

You can call this task as "rake import_incidents_csv:create_incidents"

Answer 5

I've used this one in the past. It takes any type of model.

rake csv_model_import[bunnies.csv,Bunny]

Works like a charm.

desc "Imports a CSV file into an ActiveRecord table"
task :csv_model_import, :filename, :model, :needs => :environment do |task,args|
  lines = File.new(args[:filename]).readlines
  header = lines.shift.strip
  keys = header.split(',')
  lines.each do |line|
    params = {}
    values = line.strip.split(',')
    keys.each_with_index do |key,i|
      params[key] = values[i]
    end
    Module.const_get(args[:model]).create(params)
  end
end