_form.html.erb

<%= form_for @owner do |form| %>
    <%= form.text_field :username %>
    <%= form.password_field :password %>
    <%= form.submit %>
<% end %>

owners_controller.rb

## error 
NoMethodError in Owners#edit

class OwnersController < ApplicationController
  respond_to :html
  
  def index
    @owners = Owner.order("created_at desc")
    respond_with @owners
  
  end
  
  def new
    @owner = Owner.new
  end
  
  def create
    Owner.create(params[:owner])
    redirect_to owners_path
  end
  
  def edit
    @owner == Owner.find_by_id(params[:id])
  end
  
  def update
    owner = Owner.find_by_id(params[:id])
    owner.update_attributes(params[:owner])
    redirect_to owners_path
  end
  
end