How to create like in rails

                   How to Create Like in Rails

create like table

class CreateLikes < ActiveRecord::Migration
  def change
    create_table :likes do |t|
      t.boolean :like
      t.integer :user_id
      t.integer :event_id
      t.timestamps
    end
  end
end

relationship  like model

    belongs_to :user
    belongs_to :event
    validates_uniqueness_of :user, scope: :event

relationship in user or any model like this

 has_many :like, dependent: :destroy

  def thumbs_up_total
      self.like.where(like: true).size
  end
 
  def thumbs_down_total
      self.like.where(like: false).size
  end

Controller code in productcontroller , eventcontroller any model you want to use

   def like
       #used set_event on bottom and top
       like = Like.create(like: params[:like], user: current_user, event: @event)
        if like.valid?
            flash[:success] = "Your selection was successfull"
            redirect_to :back
        else
           flash[:danger] = "You can only like/dislike a event once"
           redirect_to :back
        end
    end

view in you write same as ( x is local object you can replace from your object like event , product)

  <div class="thumbs">
                    <%= link_to like_event_path(x, like: true), method: :post do %>
                    <i class="white glyphicon glyphicon-thumbs-up">&nbsp<%= x.thumbs_up_total %></i>
                    <% end %> &nbsp&nbsp&nbsp&nbsp
                    <%= link_to like_event_path(x, like: false), method: :post do %>
                    <i class="white glyphicon glyphicon-thumbs-down">&nbsp<%= x.thumbs_down_total %></i>
                    <% end %>
                   
                </div>

route

resources :events do
    member do
      post 'like'
      end