Authenticate with bcrypt for change password - ruby-on-rails

Question

Well, I got a problem to authenticate the user at the moment of changing his/her password, I get the mail and password and run the self.authenticate, but it keep returning me nil
I use the same format as when I log in. Here's the code
user_controller.rb
def change_pw
#user = User.authenticate(current_user.email, params[:password])
logger.info current_user.email
if #user.nil?
logger.info params[:password]
flash[:notice] = "incorrect password"
redirect_to :back
else
if #user.valid?
#user.password = #user.new_password unless #user.new_password.nil? || #user.new_password.empty?
#user.save
flash[:notice] = "Los cambios se han realizado exitosamente."
redirect_to #user
end
end
end
user.rb
def self.authenticate(email, password)
user = find_by_email(email)
if user && user.password_hash == BCrypt::Engine.hash_secret(password, user.password_salt)
return user
else
return nil
end
end
form
<%= form_for(#user, :url => "/change_password") do |f| %>
<%= hidden_field(:user, :email, :value => #user.email) %>
<div class="form-group">
<div class="form-group col-md-4"><%= f.label :password %></div>
<div class="form-group col-md-8"><%= f.password_field(:password, :class => "form-control") %></div>
</div>
<div class="form-group col-md-4"><%= f.label :new_password %></div>
<div class="form-group col-md-8"><%= f.password_field(:new_password, :class => "form-control") %></div>
<div class="form-group">
<div class="form-group col-md-4"><%= f.label :new_password_confirmation %></div>
<div class="form-group col-md-8"><%= f.password_field(:new_password_confirmation, :class => "form-control") %></div>
</div>
<div class="col-md-offset-2 col-md-10">
<button type="submit" class="btn btn-default">Change Password</button>
</div>
<% end %>
I'm just trying to figure it out why it keeps returning me nil and how I can success on change password.

Answer 1

I finally found the reason of all my problems
def change_pw
#user = User.authenticate(current_user.email, params[:user][:password])
if #user.nil?
flash[:notice] = "Contraseña incorrecta"
redirect_to :back
else
if #user.valid?
#user.password = params[:user][:new_password] unless params[:user][:new_password].nil? || params[:user][:new_password].empty?
#user.save
redirect_to #user
end
end
end
There's the way to solve it, i had to specified the params directly and that's all