creating rake task for importing data from csv file

问题

I am creating a rake task to import csv file data to my database (MySQL). Here is what I did but It is not working

require 'csv'
namespace :tech do                                                                                                                                          

desc "Import tech from csv file"

task temp: :environment do

file = "tech.csv"

CSV.foreach(file, :headers => true) do |row|
  Temp.create ({
                         :current => row[1],
                         :today => row[2],
                         :week=> row[3],
                         :month => row[4]
                       })
end

end end

but when I run rake tech:temp it throws this error

Don't know how to build task 'tech:temp'
y/gems/2.0.0/gems/rake-10.3.2/lib/rake/task_manager.rb:62:in `[]'
/p353/lib/ruby/gems/2.0.0/gems/rake-10.3.2/lib/rake/application.rb:149:in `invoke_task'
lib/ruby/gems/2.0.0/gems/rake-10.3.2/lib/rake/application.rb:106:in `block (2 levels) in    top_level'
 /lib/ruby/gems/2.0.0/gems/rake-10.3.2/lib/rake/application.rb:106:in `each'

 /lib/ruby/gems/2.0.0/gems/rake-10.3.2/lib/rake/application.rb:106:in `block in top_level'

 /lib/ruby/gems/2.0.0/gems/rake-10.3.2/lib/rake/application.rb:115:in `run_with_threads'

  /lib/ruby/gems/2.0.0/gems/rake-10.3.2/lib/rake/application.rb:100:in `top_level'
  lib/ruby/gems/2.0.0/gems/rake-10.3.2/lib/rake/application.rb:78:in `block in run'
  /lib/ruby/gems/2.0.0/gems/rake-10.3.2/lib/rake/application.rb:176:in ` standard_exception_handling'
  lib/rake/application.rb:75:in `run'
  /ruby/gems/2.0.0/gems/rake-10.3.2/bin/rake:33:in `<top (required)>'
  bin/rake:23:in `load'
  /bin/rake:23:in `<main>'

I already have Temp model existing and respective table in database after migration

回答1:

I was having the same issue while writing rake task to populate data in database. In my case the error was same and it was nothing just running the rake task in wrong manner.

I guess you are doing the same, as per the error I can guess

You are running rake tech:temp in which task is temp and namespace is tech, which is wrong you should pass it other was as first you need to give task name then namespace.

so the right command is

rake temp:tech

It hope this will work. It is silly I know

来源：https://stackoverflow.com/questions/26212250/creating-rake-task-for-importing-data-from-csv-file

标签

ruby-on-rails

ruby

rake

rake-task