Problems With Search Bar Ruby On Rails - ruby-on-rails

Question

I was trying to implement a Search Bar and when i tested, it worked in a strange way: only the last letters could be found, or the whole name.
I'm sorry if the problem is simple to solve, i'm new to Ruby On Rails, and i really need this fixed and i couldn't find out how to fix it myself.
(Sorry about my bad English)
Here's my html:
<div class="search">
<%= form_for root_path, :url => {:action => "search"}, class: 'navbar-form' do |f| %>
<%= text_field_tag 'ad[price_min]', #ads_min, :placeholder => "Price min", class: "form-control embed-responsive-item" %>
<%= text_field_tag 'ad[price_max]', #ads_max, :placeholder => "Price max", class: "form-control embed-responsive-item" %>
<%= text_field_tag 'ad[title]', #ads_text, :placeholder => "Search xablau by name", class: "form-control embed-responsive-item" %>
<button class="btn btn-info" ><i class="glyphicon glyphicon-search"></i></button>
<% end %>
</div>
Here's my controller:
def search
if params[:ad].present?
#ads_min = params[:ad][:price_min]
#ads_max = params[:ad][:price_max]
#ads_title = params[:ad][:title]
#ads = Ad.search( params[:ad] )
else
#ads = Ad.all
end
render :action => 'index'
end
Here's my model:
def self.search(query)
price_min = query[:price_min].present? ? "price >= #{query[:price_min].to_f}" : nil
price_max = query[:price_max].present? ? "price <= #{query[:price_max].to_f}" : nil
title = query[:title].present? ? "title LIKE '%#{query[:title]}'" : nil
query = [title, price_min, price_max].compact.join(" AND ")
return Ad.where( query )
end

Answer 1

You have to use ILIKE and %text% instead of %text
title = query[:title].present? ? "title ILIKE '%#{query[:title]}%'" : nil
Because %text% matches with any string that contains text but %text matches only with string that have text on the end of string.
PS: you have to rewrite the search method because it's insecure put a user based text in sql. Do not do that "title LIKE '%#{query[:title]}'" Write something like that where("title ILIKE ?", "%#{params[:q]}%")