Sinatra: wrong number of arguments (4 for 0..2) - mysql

Question

I'm currently developing an app with Sinatra, ActiveRecord and MySQL. I'm working on the sign up form, which looks like this:
app.rb:
post '/signup' do
password_salt = BCrypt::Engine.generate_salt
password_hash = BCrypt::Engine.hash_secret(params[:password], password_salt)
#usuarios = User.new(params[:nombre], params[:cedula], password_hash, "admin")
if #usuarios.save
redirect './signup', :notice => "Usuario creado exitosamente."
else
redirect './signup', :error => "Ha ocurrido un error, intente nuevamente."
end
end
And the view looks like this, signup.erb:
<form id="registro" action="/signup" method="POST">
<fieldset>
<legend>Ingrese sus datos</legend>
<label>Nombre
<input type="text" name="nombre">
</label>
<label>Cédula
<input type="text" maxlength="10" name="cedula">
</label>
<label>Contraseña
<input type="password" name="password">
</label>
<!-- TO-DO:
Dropdown list con los diferentes tipos de usuarios, i.e.: admin, secretario, etc.
-->
<input type="submit" id="registerButton" class="button small">Finalizar registro</a>
</fieldset>
</form>
Whenever I try to create a new user, I get the following error:
ArgumentError - wrong number of arguments (4 for 0..2)
Considering that the table I'm trying to insert the values has 4 columns, I don't understand why I'm getting this error.
Any insight to help me solve this inconvenience would be greatly appreciated!
Thanks in advance.

Answer 1

ActiveRecord::new method allows only 2 parameters as arguments, it should be a hash. fix:
User.new(params[:nombre], params[:cedula], password_hash, "admin")
to:
User.new(nombre: params[:nombre], cedula: params[:cedula], password: password_hash, role: "admin")
You should always check the documentation, in 99% cases you can find a problem:
New objects can be instantiated as either empty (pass no construction
parameter) or pre-set with attributes but not yet saved (pass a hash
with key names matching the associated table column names). In both
instances, valid attribute keys are determined by the column names of
the associated table – hence you can’t have attributes that aren’t
part of the table columns.
new(attributes = nil, options = {})
Examples:
# Instantiates a single new object
User.new(:first_name => 'Jamie')
# Instantiates a single new object using the :admin mass-assignment security role
User.new({ :first_name => 'Jamie', :is_admin => true }, :as => :admin)
# Instantiates a single new object bypassing mass-assignment security
User.new({ :first_name => 'Jamie', :is_admin => true }, :without_protection => true)