implement current_user

app/controllers/application_controller.rb

@@ -1,2 +1,5 @@
 class ApplicationController < ActionController::API
+  def current_user
+    @current_user ||= User.find_by(id: request.cookies['user_id'])
+  end
 end

app/controllers/posts_controller.rb

@@ -27,6 +27,9 @@ class PostsController < ApplicationController
 
   # Only allow a list of trusted parameters through.
   def post_params
-    params.require(:post).permit(:content, :user_id, :quoted_post_id)
+    {
+      user: current_user,
+      **params.require(:post).permit(:content, :quoted_post_id)
+    }
   end
 end

app/controllers/user_follows_controller.rb

@@ -21,6 +21,9 @@ class UserFollowsController < ApplicationController
 
   # Only allow a list of trusted parameters through.
   def user_follow_params
-    params.require(:user_follow).permit(:follower_id, :followed_id)
+    {
+      follower: current_user,
+      **params.require(:user_follow).permit(:followed_id)
+    }
   end
 end

app/models/post.rb

@@ -3,30 +3,26 @@ class Post < ApplicationRecord
   belongs_to :quoted_post, optional: true, class_name: 'Post'
 
   validates :content, length: { maximum: 777 }
-  validates :content, presence: true, if: :quoted_post?
+  validates :content, presence: true, unless: :repost?
 
   validate :user, :limit_of_post_per_day
 
+  def repost?
+    kind == :quoted_post
+  end
+
   def kind
-    if quoted_post?
-      :quoted_post
-    elsif repost?
+    if quoted_post_id.blank?
+      :post
+    elsif content.blank? && quoted_post_id.present?
       :repost
     else
-      :post
+      :quoted_post
     end
   end
 
   private
 
-  def quoted_post?
-    content.present? && quoted_post_id
-  end
-
-  def repost?
-    content.blank? && quoted_post_id
-  end
-
   def limit_of_post_per_day
     posts_from_day = user&.posts&.where('created_at >= ?', Time.zone.now.beginning_of_day)