Rails: Ajax for Like Button and Updating Like Count - ruby-on-rails

Question

I am able to update the like and unlike button via ajax, but I am not able to update the like count.
Post has_many likes
likes_controller.rb
def create
#like = Like.new(:post_id => params[:post_to_be_liked])
if #like.save
respond_to do |format|
format.html {redirect_to :back, notice: "Liked!"}
format.js
end
end
end
view.html.erb
<% #post = user.posts.first %>
<div id="send_like_for_<%= #post.id %>">
<% if #post.is_liked?(#post, current_user)%>
<%= render 'unlike'%>
<%else%>
<%= render 'like'%>
<%end%>
</div>
<div id="liked_<%= #post.id %>" %>
<%= render 'liked_users'%>
</div>
create.js.erb
$("#send_like_for_<%= params[:post_to_be_liked]%>").html("<%= escape_javascript(render('users/unlike')) %>")
$("#liked_<%= params[:post_to_be_liked]%>").html("<%= escape_javascript(render('users/liked_users')) %>")
_like.html.erb
<%= link_to "LIKE", likes_path(:post_to_be_liked => #post.id), remote: true, :method=>:post %>
_unlike.html.erb
<span> UNLIKE </span>
_liked_users.html.erb
<%= "#{#post.likes.length} like this" %>
The like/unlike functionality works just fine and when someone likes the post the button changes to Unlike. But the like count doesn't increase.

Answer 1

But why are you doing this in your view?
<% #post = user.posts.first %>
It will update only your first post always. I can't understand.
Try with this:
_liked_users.html.erb
<%= #updated_post = Post.where(id: #post.id) %>
<%= "#{#updated_post.likes.length} like this" %>
or
<%= #post.reload %>
<%= "#{#post.likes.length} like this" %>
Edit (Try to build your like this):
def create
#post = Post.where(id: params[:post_to_be_liked])
#like = #post.likes.build(:post_id => #post.id)
if #like.save
respond_to do |format|
format.html {redirect_to :back, notice: "Liked!"}
format.js
end
end
end

Answer 2

I think you should try to do this
#post = user.posts.first
after save in your controller and remove <% #post = user.posts.first %> from erb file and if it is not possible then initialize #post in your controller#create
#post = Post.find(params[:post_to_be_liked])