Display name of user all users who have liked a particular post - ruby-on-rails

Question

I want to name(s) of all user who have liked a post.
I have 4 models: user,post,like and review.
A user can have many posts.
Post can reviews && post can have many likes.
I am able to count likes on post but i am not able to display name of users who have liked a post.
Like Model:
class Like < ApplicationRecord
belongs_to :post
belongs_to :user
end
Post Model
class Post < ApplicationRecord
belongs_to :user
has_many :reviews, dependent: :destroy
has_many :likes, dependent: :destroy
validates :title, presence: true
validates :body, presence: true
end
Review Model:
class Review < ApplicationRecord
belongs_to :user
belongs_to :post
end
User Model:
class User < ApplicationRecord
before_create { generate_token(:auth_token) }
before_save { self.email = email.downcase }
has_secure_password
has_many :posts
has_many :reviews
has_many :likes
validates :name, presence: true
validates :email, presence: true, uniqueness: true
validates :password, confirmation: true
validates :password_confirmation, presence: true, unless: Proc.new { |a| !a.new_record? && a.password.blank? }
def send_password_reset
generate_token(:reset_password_token)
self.reset_password_sent_at = Time.zone.now
save!
UserMailer.password_reset(self).deliver
end
def generate_token(column)
begin
self[column] = SecureRandom.urlsafe_base64
end while User.exists?(column => self[column])
end
end[![enter image description here][1]][1]
_post.html.erb
<h1> Posts ( <%= #posts.count %> ) </h1>
<% #posts.each do |p| %>
<div class="form-field">
<h4>
<b><%= p.title %></b>
<%= link_to "Edit", edit_post_path(p.id), class: "btn btn-warning col-md-2-offset", style: "align-right" %>
<%= link_to "Delete", p, method: :delete, class: "btn btn-danger col-md-2-offset" ,data: { confirm: "You sure? "}, style: "align-right" %>
<% if p.reviews.count > 0 %>
<%= link_to "View Comments", review_path(p.id), class: "btn btn-primary" %>
<% end %>
</h4>
<%= p.body %>
<br>
<% if p.likes.count > 0 %>
Likes: <%= p.likes.count %>
<% end %>
<br>
<% if Like.find_by(user_id: current_user.id,post_id: p.id) %>
<%= link_to " UnLike ", like_path(p.id), method: :delete,class: "btn btn-
primary fa fa-thumbs-down" %>
<% else %>
<%= link_to " Like ", post_likes_path(p.id), method: :post, class: "btn btn-
primary fa fa-thumbs-up" %>
<% end %>
<br>
</div>
<% end %>
I was trying something like this,
I need to connect user,like and post table, for post which has been liked by some user.
I somehow need to merge two-three queries.

Answer 1

#like is an array,
instead use
#like = #liked.where(post_id: 7).first
Then try #like.user

Answer 2

First I hope you use eager loading to prevent the N+1 issue, when loading likes of a post, and their users
Second
I would suggest changing this peace of code
<% if Like.find_by(user_id: current_user.id,post_id: p.id) %>
<%= link_to " UnLike ", like_path(p.id), method: :delete,class: "btn btn-primary fa fa-thumbs-down" %>
<% else %>
<%= link_to " Like ", post_likes_path(p.id), method: :post, class: "btn btn-primary fa fa-thumbs-up" %>
<% end %>
With
<% if p.likes.find_by(user_id: current_user.id) %>
<%= link_to " UnLike ", like_path(p.id), method: :delete, class: "btn btn-primary fa fa-thumbs-down" %>
<% else %>
<%= link_to " Like ", post_likes_path(p.id), method: :post, class: "btn btn-primary fa fa-thumbs-up" %>
<% end %>
This will not perform additional DB request
And finnally how to shows user name of each user that has liked the post
I would suggest creating a helper method for this, as it may be need for multiple places
def liked_by_users(post)
post.likes.map do |like|
like.user.username
end.join(', ')
end

Answer 3

Are you just trying to get the names of users that have liked a post to display them? If that's the case you can add a function to one of your controllers called something like get_likes_for(post_id) that will return an array of all the users that liked a post:
def get_likes_for(pid)
users = []
Like.where(post_id: pid).each do |l|
users << User.find_by(id: l.user_id).name
end
users
end
Then you can list them in your post controller like this:
<% if p.likes.count > 0 %>
Likes: <%= p.likes.count %>
Liked By: <%= get_likes_for(p.id).to_s %>
<% end %>
This won't exactly connect the three models like the last part of your posts asks, but it will at least allow you to display the users who have liked a post.