Search using like query in Ruby on Rails - ruby-on-rails

Question

I am a beginner in ROR development. I have navigation and I want search box on every page and when I enter some keyword, it should do like query across table's field. I tried using some online tutorials but could not do it.
My table name : tutorials
here is my search form on navigation bar
<li><%= link_to 'Login', :controller => 'access', :action => 'login' %></li>
<li><%= link_to 'Sign Up', :controller => 'users', :action => 'new' %></li>
<li><%= link_to 'Logout', :controller => 'access', :action => 'logout' %></li>
<div align="right">
<%= form_tag("/search", method: "get") do %>
<%= label_tag(:q, "Search for:") %>
<%= text_field_tag(:q) %>
<%= submit_tag("Search") %>
<% end %>
</div>
Here is my controller
class SearchController < ApplicationController
def show
#tutorial = Tutorial.find(params[:q])
respond_to do |format|
format.html # show.html.erb
format.json { render json: #tutorial }
end
end
end
Here is my model
class Search < ActiveRecord::Base
def #tutorial.search(search)
if search
find(:all, :conditions => ['tutorial_name LIKE ?', "%#{search}%"])
else
find(:all)
end
end
end
I am not sure how to do this. Please help

Answer 1

It's often true that a bad name indicates wrong thinking. I believe your name Search for the model is in this category. It should probably be called Tutorial, no? Search is something you do to a model, not the model itself.
If this guesswork is correct and the model is now called Tutorial and it has a field called name that is a string, then your model will be
class Tutorial < ActiveRecord::Base
def self.search(pattern)
if pattern.blank? # blank? covers both nil and empty string
all
else
where('name LIKE ?', "%#{pattern}%")
end
end
end
This makes the model "smart" on how to search through tutorial names: Tutorial.search('foo') will now return all tutorial records that have foo in their names.
So we can create a controller that uses this new functionality:
class SearchController < ApplicationController
def show
#tutorials = Tutorial.search(params[:q])
respond_to do |format|
format.html # show.html.erb
format.json { render json: #tutorial }
end
end
end
The corresponding view must display the tutorials. Yours doesn't. The simplest way to do this is write a partial that renders exactly one tutorial. Say it's called _tutorial.html.erb.
Then in the view for Search, you need to add
<%= render :partial => #tutorials %>
to actually display the search results.
Addition
I'll build a little example.
# Make a new rails app called learning_system
rails new learning_system
# Make a new scaffold for a Tutorial model.
rails g scaffold Tutorial name:string description:text
# Now edit app/models/tutorial.rb to add the def above.
# Build tables for the model.
rake db:migrate
rails s # start the web server
# Now hit http://0.0.0.0:3000/tutorials with a browser to create some records.
<cntrl-C> to kill the web server
mkdir app/views/shared
gedit app/views/shared/_search_box.html.erb
# Edit this file to contain just the <%= form_tag you have above.
# Now add a header at the top of any view you like, e.g.
# at the top of app/views/tutorials/index.html.erb as below
# (or you could use the layout to put it on all pages):
<h1>Listing tutorials</h1>
<%= render :partial => 'shared/search_box' %>
# Make a controller and view template for searches
rails g controller search show
# Edit config/routes.rb to the route you want: get "search" => 'search#show'
# Verify routes:
rake routes
search GET /search/:id(.:format) search#show
tutorials GET /tutorials(.:format) tutorials#index
POST /tutorials(.:format) tutorials#create
new_tutorial GET /tutorials/new(.:format) tutorials#new
edit_tutorial GET /tutorials/:id/edit(.:format) tutorials#edit
tutorial GET /tutorials/:id(.:format) tutorials#show
PUT /tutorials/:id(.:format) tutorials#update
DELETE /tutorials/:id(.:format) tutorials#destroy
# Edit app/controllers/search_controller.rb as above.
# Create app/views/tutorial/_tutorial.html.erb with following content:
<tr>
<td><%= tutorial.name %></td>
<td><%= tutorial.description %></td>
</tr>
# Edit app/views/search/show.html.erb to have following content:
<h1>Show Search Results</h1>
<table>
<%= render :partial => #tutorials %>
</table>
Now try a little test. Fill in a search criterion and press the Search button.

Answer 2

On Rails 6 you can use for search action implementation in the controller.rb:
def search
keyword = params[:q] #you can get this params from the value of the search form input
#posts = Post.where("title LIKE ?", "%#{keyword}%")
end