How to set up search with will_paginate? - ruby-on-rails

Question

I had install will_paginate and in the posts_controller index def write:
#posts = Post.paginate(:page => params[:page], :per_page => 10, :order => 'id DESC', :conditions => ['title like ?', "%#{params[:search]}%"])
But search doesn't work. When I click on search button it changes url to:
http://178.62.xxx.xxx/find/?utf8=%E2%9C%93&search=the
And the posts in the page stay the same.
Routes:
get "/find/" => "posts#index"
Post model:
def self.search(query)
where("title like :title", title: "%#{query.strip.chomp}%")
end
In the index.html.erb:
<%= form_tag('/find/', :method => "get", id: "search-form") do %>
<%= text_field_tag :search, params[:search], placeholder: "Найти посты", :class => "search" %>
<%= submit_tag "OK", :name => nil, :class => "search_btn" %>
<% end %>

Answer 1

I solved it.
First, I created search form which request to index action (GET /posts).
# index.html.erb - Search Form
<%= form_tag posts_path, method: :get do %>
<%= text_field_tag :search, "" %>
<%= submit_tag 'Search' %>
<% end %>
Next, I defined index action.
# Controller
def index
# params = { :search => 'search keywords ...' }
#products = Product.search(params).paginate(:page => params[:page], :per_page => 2)
end
Then, define Post#search.
paginate method is used on only ActiveRecord::Relation.
So, Post#search must return ActiveRecord::Relation.
def self.search(params)
products = all # for not existing params args
products = products.where("name like ?", "%#{params[:search]}%") if params[:search]
products
end
That's all.