How can I create a Rails search bar facility without using additional gems

Question

I am building a small classifieds application for our community where folks can list products for sale using a form with params description and image only.

Both params are in the schema.rb

THE PROBLEM:

I have embedded the search bar on my index.html.erb and also created a show.html.erb which is blank. Currently the search bar does nothing except look pretty,

I am struggling to understand how to get the search wired up to interrogate the description param and deliver the results onto my show.html.erb.

NB: I would like the show.html.erb page and its search results to mirror my index page cosmetically and achieve this task without having to install any further gems.

class PinsController < ApplicationController
before_action :set_pin, only: [:show, :edit, :update, :destroy]
before_action :correct_user, only: [:edit, :update, :destroy]
before_action :authenticate_user!, except: [:index, :show]

def index
@pins = Pin.all.order("created_at DESC").paginate(:page =>   params[:page], :per_page => 15)
end


def show
end


def new
@pin = current_user.pins.build
end


def edit
end


def create
@pin = current_user.pins.build(pin_params)
if @pin.save
  redirect_to @pin, notice: 'Pin was successfully created.'
else
  render :new
end
end


def update
if @pin.update(pin_params)
redirect_to @pin, notice: 'Pin was successfully updated.'
else
render :edit
end
end


def destroy
@pin.destroy
redirect_to pins_url
end


private
# Use callbacks to share common setup or constraints between actions.
def set_pin
  @pin = Pin.find_by(id: params[:id])
end

def correct_user
  @pin = current_user.pins.find_by(id: params[:id])
  redirect_to pins_path, notice: "Not authorized to edit this pin" if @pin.nil?
end

# Never trust parameters from the scary internet, only allow the   white list through.
def pin_params
  params.require(:pin).permit(:description, :image)
end
end  

Answer 1

Change your index method to either have a search query or not.

def index
  if params[:query]
    @results = Advert.where('lower(description) LIKE ?', '%#{params[:query].downcase}%')
  else
    @results = Advert.all
  end
end

You can also create filters using javascript or install either searchkick gem or if you need something REALLY simple install rails4-autocomplete