Rails.application.routes.draw do
    resources :posts do
      resources :comments, only: [:create, :destroy]
      resource :likes, only: [:create, :destroy]
    end
  end

  def liked_by?(user)
    likes.where(user_id: user.id).exists?
  end

class LikesController < ApplicationController

  def create
    @post = Post.find_by(id: params[:post_id])
    #Conditions pour éviter les clics continus
    unless @post.liked_by?(current_user)
      @like = current_user.likes.new(post_id: @post.id)
      @like.save
    end
  end

  def destroy
    @post = Post.find_by(id: params[:post_id])
    @like = current_user.likes.find_by(post_id: @post.id)
    @like.destroy
  end

end

#Donnez un identifiant car il faut en faire Ajax
div id='like_#{ @post.id }'
   #Partialiser l'icône similaire
   = render 'like', post: @post

#Supprimer comme
- if post.liked_by?(current_user)
  = link_to post_likes_path(post), method: :delete, remote: true do
    i.fas.fa-heart style='color: red;'
    = post.likes.count

#Comme c'est gentil
- else
  = link_to post_likes_path(post), method: :post, remote: true do
    i.far.fa-heart
    = post.likes.count

$("#like_<%= @post.id %>").html("<%= j(render 'posts/like', post: @post ) %>");

$("#like_<%= @post.id %>").html("<%= j(render 'posts/like', post: @post ) %>");

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