Question

I making a simple login validation and I want to validate the name and the password.

finances_controller .rb

  def login
    @user = User.find_by_name(params[:user])
    if @user
      session[:user_id] = @user.id
      redirect_to :action => 'index'
    end

  end

login.html.erb

<h1>Login</h1>
<%= form_for @user do |f| %>
Nome: <%= f.text_field :name %>
Senha: <%= f.password_field :password %>
<%= f.submit %>
<% end %>

This is the error:

undefined method `model_name' for NilClass:Class

Extracted source (around line #2):

1: <h1>Login</h1>
2: <%= form_for @user do |f| %>
3: Nome: <%= f.text_field :name %>
4: Senha: <%= f.password_field :password %>
5: <%= f.submit %>

model
user.rb

class User < ActiveRecord::Base
  attr_accessible :name, :password, :password_digest

end

ps: the digest is to make this secure.

Can anybody provide any inputs?

Answer 1

seems like you’re searching a user by her name, but giving a hash consisted of user attributes as an argument (params[:user]). I think that’s the reason @user remains nil and this error is shown.

could you check if changing the argument to params[:user][:name] gives better result?