How to upload correctly CSV file in Rails - ruby-on-rails

Question

I am trying to upload a csv file with Rails from Active Admin.
I have a model User, which has columns name(string) and age(integer).
My csv file looks like this:
name,age
"Peter",31
"Susan",30
"John",40
Then I have in my admin/user.rb:
ActiveAdmin.register User do
permit_params :name, :age
collection_action :upload_csv do
render "admin/csv/upload_csv_user"
end
collection_action :import_csv_data_user, :method => :post do
ret_val = CsvDb.update_model_from_csv("user", params[:dump][:file])
redirect_to :action => :index, :notice => ret_val
end
end
And in my admin/csv/upload_csv_user.html.erb I have:
<%= form_for(:dump, :url=>{:action=>"import_csv_data_user"}, :html => { :multipart => true }) do |f| %>
<%= f.file_field :file %>
<%= f.submit "Submit", confirm: "Are You Sure?" %>
<% end %>
Inside a csv_db.rb file I have:
require 'csv'
module CsvDb
def self.update_model_from_csv(model_name, file)
csv_data = CSV.read(file.path)
columns = csv_data.shift
model = model_name.classify.constantize
ret_val = "Data updated successfully!"
begin
model.import columns, csv_data, on_duplicate_key_update: columns, validate: false
rescue Exception => e
ret_val = e
end
ret_val
end
end
When I try to upload the file I get the following error: Illegal quoting in line 1.
And below it's written:
part "\"name"
parse "\"name,age\""
parts ["\"name", "age\""]
unconverted nil
in_extended_col false
csv []
I checked lots of examples and I can't find the error. Maybe my csv file is formatted incorrectly.

Answer 1

require 'csv'
module CsvDb
def self.update_model_from_csv(model_name, file_params)
CSV.foreach(file_params.path, headers: true) do |row|
model = model_name.classify.constantize
begin
name = row["name"]
age = row["age"]
if model.create(name: name, age: age)
result = "Imported successfully!"
end
rescue Exception => e
result = e
end
end
result
end
end
Use this method in controller as: -
#pass model name and params[:file], which is csv uploaded from user end
CsvDb.update_model_from_csv(model_name, params[:file])