How to show all my posts liked by user

I'm trying to show all the posts that I like by current user.

I'm using Ruby on Rails, and the gems Devise and "Acts As Votable". I've been following the Acts As Votable guide but can't make it work.

I think this is the way to go:

@post.liked_by @user1
@post.downvote_from @user2

I created a new controller called dashboard:

class DashboardController < ApplicationController
  def index
        @post = Post.all.liked_by current_user
  end
end

But when I run my web I get:

undefined method `liked_by' for #<Post::ActiveRecord_Relation:0x9aa89b0>

What can I do?

The issue is that you're calling it on an ActiveRecord Relation, not on the model object, itself. A couple of minor changes, and you'll be all set.

First, we make the instance variable plural to show that it's receiving multiple records (a user can like multiple posts):

class DashboardController < ApplicationController
  def index
    @posts = Post.all.liked_by current_user
  end
end

Then, to process these, you'll want to navigate to the individual record or records. If you want to process the whole list, you can do this:

@posts.each do |post|
  post.liked_by @user1
  post.downvote_from @user2
end

This will apply the like and downvote to all of the posts. However, you can update only the first post, like this:

post = @posts.first
post.liked_by @user1
post.downvote_from @user2

If you already knew what post you wanted to vote on (maybe based on which was chosen in the UI), you could do this:

@post = Post.find_by(params[:id])
@post.liked_by @user1
@post.downvote_from @user2

Making sure to keep your plural and singular names distinct will help you keep in tune with Rails conventions and will help you easily identify when you're working with a collection or an individual object.