Trying to use validations with local variables

Question

So I've been trying to use validations on ruby on rails with the form_for format

I followed this: https://stackoverflow.com/a/33048292/8054234

but im getting the following error:

<%= pluralize(object.errors.count, "error") %> prevented the form from being saved:

undefined method `errors' for :user:Symbol

Any idead how I could make this work/fix it?

edit1 uploaded full form code:

<%= stylesheet_link_tag "users" %>

<div class="jumbotron"
    <div class="container">

    <h2>Signup</h2>


<%= form_for :user, url: '/users' do |f| %>
  <%= form_errors_for :user %>
  Número de Empregado: <br>
  <%= f.number_field :NumeroEmpregado %><br>
  Primeiro e Último Nome: <br>
  <%= f.text_field :nome %><br>
  Password: <br>
  <%= f.password_field :password %><br>
  Confirmação Password: <br>
  <%= f.password_field :password_confirmation %><br>


  <%= f.submit "Submit" %>

    </div>
</div>

<% end %>

Replace `<%= form_errors_for :user %>` To ` <%= form_errors_for f.object %>` — hgsongra, Jun 21 '17 at 12:49
This fixed the error, but the error message is still not showing... — Dando Mando Nogger, Jun 21 '17 at 12:50

yzalavin · Answer 1 · 2017-06-21T12:47:10.030

2

object must be an instance of an ActiveRecord model. You are passing :user as a symbol.

You should pass an instance of User. If you use some authentication logic you could pass current_user to this method.

UPD:

The error says that your object does not understand method errors. :user is a Symbol. It is not a variable that holds your user. Therefore, it does not implement method errors.

User is a model that inherits behaviour from ActiveRecord. It provides method errors. For example, object = User.create(params) will work.

edited Jun 21 '17 at 12:47

answered Jun 21 '17 at 12:40

yzalavin

1,788
1
13
19

Can you explain a bit further? I'm quite new to RoR and I don't quite understand what you want me to do, sorry – Dando Mando Nogger Jun 21 '17 at 12:43

hgsongra · Accepted Answer · 2017-06-21T13:25:23.590

0

EDITED

In your UsersController in new action update as below

class UsersController < ApplicationController
  def new
    @user = User.new
  end
end

and in your views/users/_form.html.erb file form do the below code

<%= form_for(@user) do |f| %>
  <% if @user.errors.any? %>
    <div id="error_explanation">
    <h2><%= pluralize(@user.errors.count, "error") %> prohibited this user from being saved:</h2>
    <ul>
      <% @user.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
    </ul>
    </div>
  <% end %>

  Número de Empregado: <br>
  <%= f.number_field :NumeroEmpregado %><br>

  Primeiro e Último Nome: <br>
  <%= f.text_field :nome %><br>

  Password: <br>
  <%= f.password_field :password %><br>

 Confirmação Password: <br>
 <%= f.password_field :password_confirmation %><br>

 <%= f.submit "Submit" %>

<% end %>

edited Jun 21 '17 at 13:25

answered Jun 21 '17 at 13:01

hgsongra

1,454
15
25

gives me this error: `undefined method 'errors' for nil:NilClass` on this line `<% if f.object.errors.any? %>` – Dando Mando Nogger Jun 21 '17 at 13:05
Updated this line `<%= pluralize(f.object.errors.count, "error") %>` – hgsongra Jun 21 '17 at 13:06
I get this error on `line 3 => <% if f.object.errors.any? %>` – Dando Mando Nogger Jun 21 '17 at 13:11
Use `User` model object with `form_for` like this `<%= form_for(@user) do |f| %>` where `@user` is `@user = User.new` in your controller – hgsongra Jun 21 '17 at 13:14
did it, now I get the following error: `First argument in form cannot contain nil or be empty` on line `<%= form_for(@user) do |f| %>` – Dando Mando Nogger Jun 21 '17 at 13:18
1

have you created `@user = User.new` in your controller from where this page rendering? – hgsongra Jun 21 '17 at 13:23
yes: `def create @user = User.new(user_params) if user.save session[:user_id] = user.id redirect_to '/' else redirect_to '/signup' end end ` – Dando Mando Nogger Jun 21 '17 at 13:25
Done this, code works, but It's still not showing the error messages when I submit the form empty... – Dando Mando Nogger Jun 21 '17 at 13:29
what is the console output? does it redirect back to the same form page? – hgsongra Jun 21 '17 at 13:31
redirects back to the same page yes, but without displaying any error message for the fields being empty – Dando Mando Nogger Jun 21 '17 at 13:32

Trying to use validations with local variables

2 Answers2