libr-2/app/controllers/api/v1/timeline_controller.rb

class Api::V1::TimelineController < Api::V1::ApplicationController

  skip_before_action :authenticate_user_from_token

  before_action :fetch_current_user, only: [:index]

  def latest
    render json: Post.order(created_at: :desc).page(params[:page]), each_serializer: EachPostSerializer
  end

  def hottest
    render json: Post.order(viewed_times: :desc).page(params[:page]), each_serializer: EachPostSerializer
  end

  def index
    if @current_user
      stars_ids = @current_user.stars.ids
      user_ids = stars_ids + [@current_user.id]
      posts_ids = TimelineSource.where(user_id: user_ids).order(created_at: :desc).page(params[:page]).pluck(:post_id).uniq
      render json: Post.find(posts_ids).index_by(&:id).slice(*posts_ids).values, each_serializer: EachPostSerializer
    else
      return most_liked
    end


  end

  private

  def most_liked
    render json: Post.order(likes_count: :desc).page(params[:page]), each_serializer: EachPostSerializer
  end

end