ruby on rails - How can show message error in a view, when upload a excel file? -

i'm trying show message on new view

here live demo:

http://code.runnable.com/vruvfzpoiivootau/importing-excel-files-for-ruby-on-rails 

here controller:

def new end  def create    @errors = user.import(params[:file])              if @errors.present?       render :new;      return;     end end 

here view

 import  <%= form_tag user_management_users_path, multipart: true %>   <%= file_field_tag :file  %>   <%= submit_tag "import" %>  <% end %>    <% if @errors %>    <% @errors.each |message| %>      <%= message %>     <% end %>  <% end %> 

here model:

def self.import(file)  @errors = []  spreadsheet = open_spreadsheet(file)   (2..spreadsheet.last_row).each |i|         name     = spreadsheet.cell(i,'a')           lastname = spreadsheet.cell(i,'b')       doc_nat  = spreadsheet.cell(i,'c')        user = user.create(:name => name,                                  :lastname =>lastname,                                  :doc_nat =>doc_nat)       if user.save         # stuff on successful save        else         user.errors.full_messages.each |message|           @errors << "issue line #{i}, column #{message}"         end       end   end     end  def self.open_spreadsheet(file)   case file.extname(file.original_filename)   when ".csv" roo::csv.new(file.path, csv_options: {encoding: "iso-8859-1:utf-8"})   when ".xls"  roo::excel.new(file.path, packed: false, file_warning: :ignore)   when ".xlsx" roo::excelx.new(file.path, nil, :ignore)   else raise "unknown file type: #{file.original_filename}" end 

end

i'm trying find way show message indicating row problem on index view.

for example i'm adding user exist , want show message indicating

row 1 exist row 2 duplicated row 1 must string  or  

but after uploading excel getting numbers , not message:

issue line 2, column exist issue line 3, column exist 

just getting numbers:

2  3 

if user can't saved means failed validation (although validation have @ moment on doc_nat... may want add validations "must string" conditions, etc).

for active_record object failed validation, there's array object.errors.full_messages errors found when validating.

so...

def self.import(file)   @errors = []   spreadsheet = open_spreadsheet(file)   (2..spreadsheet.last_row).each |i|       name     = spreadsheet.cell(i,'a')         lastname = spreadsheet.cell(i,'b')     doc_nat  = spreadsheet.cell(i,'c')      user = user.new(:name => name,                        :lastname =>lastname,                        :doc_nat =>doc_nat)     if user.save       # stuff on successful save      else       user.errors.full_messages.each |message|         @errors << "la información de la línea #{i}, columna #{message}"       end     end   end    @errors #  <- need return @errors array    end 

and in view...

<% if @errors %>   <% @errors.each |message| %>     <%= message %>   <% end %> <% end %>