how to create seo urls for all views using slug rails

I am creating an application on which i just want to use all my app's routes should access via seo urls using slugs. i have created a slug field in my database table. this my migration file code

class AddSlugToClients < ActiveRecord::Migration
  def change
    add_column :clients, :slug, :string
  end
end

i have added this code to my controller's show method my controller's code is:

def show    
        @client = Client.find_by_slug(params[:id])
    end

In my app's model i have added this code class Client < ActiveRecord::Base

def slug
            ename.downcase.gsub(" ", "-")  
    end
    validates_presence_of :slug
    def to_param
        slug
    end
end

now when i create a new client than client is created by the perfect slug. but when i click show link from the listing page to that clients then getting an error in url which looks like

clients/%23<Client::ActiveRecord_Relation:0xb59828d4>

now please help me to create a seo url for show page while clicking from index view