Validate search form without model - ruby-on-rails

Question

I have this form in rails, in my view new.html.erb
<%= form_for( #rent , html: { class: 'form-horizontal' }) do |f| %>
<div class="form-group">
<label for="" class="col-lg-2 col-md-3 col-sm-3 col-xs-3 control-label">year:</label>
<div class="col-lg-3 col-md-3 col-sm-3 col-xs-3">
<%= f.text_field :year, class: 'form-control' %>
</div>
<div class="col-lg-2 col-md-3 col-sm-3 col-xs-3">
<%= f.submit 'Buscar', :class =>"btn btn-sm btn-info btn-flat" %>
</div>
<div class="clearfix"></div>
</div>
<% end %>
<%= render 'shared/error_messages', object: #rent %>
In my controller I have this
class RentsController < ApplicationController
def new
#rent = RentSearch.new
end
private
def search_params
params.require(:year).permit(:year)
end
end
In my model, had this code:
class RentSearch
include ActiveModel::Validations
include ActiveModel::Conversion
extend ActiveModel::Naming
attr_accessor :year
validates :year, presence: true
validates :year, length: { is: 4 }
end
With this code I get this error
undefined method `persisted?' for #
But I made some modifications and not show error, but when submit not display any error and form is empty, I don't know how can solve this.
What is the best way to create a form in rails without model access to database and passing all validations to the controller and verify.

Answer 1

MY SOLUTION
Thanks to #Зелёный for help.
route.rb
resources :rents, only: [:index, :new, :create]
rent.rb - model
class Rent
# Validations
include ActiveModel::Validations
include ActiveModel::Conversion
extend ActiveModel::Naming
attr_accessor :year
validates :year, presence: true
validates :year, length: { is: 4 }
def initialize(attributes = {})
attributes.each do |name, value|
send("#{name}=", value)
end
end
def persisted?
false # which means this object persisted in the database.
end
end
rents_controller.rb
class RentsController < ApplicationController
def index
#params = params
end
def new
#rent = Rent.new
end
def create
#rent = Rent.new( params['/rents'] )
if #rent.valid?
redirect_to tg_rents_path( year: params['/rents']['year'] )
else
render :action => 'new'
end
end
end
new.html.erb
<%= form_for( tg_rents_path , url: {action: "create"}, html: { class: 'form-horizontal' }) do |f| %>
<div class="form-group">
<label for="" class="col-lg-2 col-md-3 col-sm-3 col-xs-3 control-label">year:</label>
<div class="col-lg-3 col-md-3 col-sm-3 col-xs-3">
<%= f.text_field :year, class: 'form-control' %>
</div>
<div class="col-lg-2 col-md-3 col-sm-3 col-xs-3">
<%= f.submit 'Search', :class =>"btn btn-sm btn-info btn-flat" %>
</div>
<div class="clearfix"></div>
</div>
<% end %>
<%= render 'shared/error_messages', object: #rent %>
Thanks to all!!