[Rails] Implementation of CSV import function
Target
Development environment
・ Ruby: 2.5.7 Rails: 5.2.4 ・ Vagrant: 2.2.7 -VirtualBox: 6.1 ・ OS: macOS Catalina
Premise
The following has been implemented.
・ Slim introduction ・ Introduction of Bootstrap3 ・ Implementation of posting function
Implementation
1. Introduce Gem
Gemfile
#Postscript
gem 'roo'
Terminal
$ bundle
2. Edit ʻapplication.rb`
application.rb
require_relative 'boot'
require 'rails/all'
require 'csv' #Postscript
Bundler.require(*Rails.groups)
module Bookers2Debug
class Application < Rails::Application
config.load_defaults 5.2
end
end
3. Model editing
book.rb
def self.import(file)
CSV.foreach(file.path, headers: true) do |row|
book = find_by(id: row["id"]) || new
book.attributes = row.to_hash.slice(*updatable_attributes)
book.save!(validate: false)
end
end
def self.updatable_attributes
['id', 'title', 'body']
end
(1) If the same ID is found in the data to be imported, the record is called, and if not found, a new one is created.
book = find_by(id: row["id"]) || new
(2) Obtain data from the CSV file.
book.attributes = row.to_hash.slice(*updatable_attributes)
③ Save without passing through validation.
book.save!(validate: false)
(4) Set the columns to be received when importing CSV.
def self.updatable_attributes
['id', 'title', 'body']
end
4. Edit the controller
books_controller.rb
def import
Book.import(params[:file])
redirect_to books_path
end
5. Add routing
routes.rb
resources :books do
collection { post :import }
end
6. Edit the view
slim:books/index.html.slim
= form_tag import_books_path, multipart: true do
= file_field_tag :file
br
= submit_tag "import", class: 'btn btn-success'
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