import CSV to rails

app/controllers/users_controller.rb

@@ -1,4 +1,13 @@
 class UsersController < ApplicationController
+  def import
+    file = params[:file]
+    return redirect_to users_path, notice: 'Only CSV please' unless file.content_type == 'text/csv'
+
+    CsvImportUsersService.new.call(file)
+
+    redirect_to users_path, notice: 'Users imported!'
+  end
+
   def index
     @users = User.all
   end

app/services/csv_import_users_service.rb

@@ -0,0 +1,20 @@
+class CsvImportUsersService
+  require 'csv'
+
+  def call(file)
+    file = File.open(file)
+    csv = CSV.parse(file, headers: true, col_sep: ';')
+    csv.each do |row|
+      user_hash = {}
+      user_hash[:name] = row['First Name']
+      user_hash[:surname] = row['Last Name']
+      user_hash[:email] = row['Email Address']
+      user_hash[:preferences] = row['Favorite Food']
+      user_hash[:phone] = row['Mobile phone number']
+      user_hash[:username] = row['Email Address'].split('@').first if row['Email Address'].present?
+      User.find_or_create_by!(user_hash)
+      # binding.b
+      # p row
+    end
+  end
+end

app/views/users/index.html.erb

@@ -1,5 +1,10 @@
 <p style="color: green"><%= notice %></p>
 
+<%= form_with url: import_users_path, method: :post do |form| %>
+  <%= form.file_field :file, accept: ".csv" %>
+  <%= form.button "Import" %>
+<% end %>
+
 <h1>
   Users:
   <%= @users.count %>

config/routes.rb

@@ -1,4 +1,8 @@
 Rails.application.routes.draw do
-  root to: redirect("/users")
-  resources :users
+  root to: redirect('/users')
+  resources :users do
+    collection do
+      post :import
+    end
+  end
 end

csv file to import.csv

@@ -0,0 +1,5 @@
+First Name;Last Name;Email Address;Favorite Food;Mobile phone number;;
+Yaro;Shm;yaro@example.com;Borsh;;;
+Yuli;Zah;yuli@example.com;;573335784;;
+Frodo;Baggins;;bread;;;
+James;Bond;;guns;;;