5.8 beerclub join button is not shown if user already in group

app/controllers/beerclubs_controller.rb

@@ -9,6 +9,7 @@ class BeerclubsController < ApplicationController
 
   # GET /beerclubs/1 or /beerclubs/1.json
   def show
+    @membership = @beerclub.memberships.find_by user_id: current_user
   end
 
   # GET /beerclubs/new

app/controllers/memberships_controller.rb

@@ -27,7 +27,7 @@ class MembershipsController < ApplicationController
 
     respond_to do |format|
       if @membership.save
-        format.html { redirect_to membership_url(@membership), notice: "Membership was successfully created." }
+        format.html { redirect_to membership_url(@membership), notice: "Successfully joined the beerclub." }
         format.json { render :show, status: :created, location: @membership }
       else
         # TODO maybe doing something wrong but the variables of new need to be reinitialized here :D

app/views/beerclubs/show.html.erb

@@ -4,11 +4,16 @@
 
 <div>
   <% if current_user %>
-    <%= form_with model: Membership.new do |form| %>
-      <%= form.hidden_field :beerclub_id, value: @beerclub.id %>
-      <%= form.hidden_field :user_id, value: current_user.id %>
-      <%= form.submit "Join the beer club" %>
+    <% if @membership.nil? %>
+      <%= form_with model: Membership.new do |form| %>
+        <%= form.hidden_field :beerclub_id, value: @beerclub.id %>
+        <%= form.hidden_field :user_id, value: current_user.id %>
+        <%= form.submit "Join the beer club" %>
+      <% end %>
+    <% else %>
+      <p>You are already in this group</p>
     <% end %>
+
   <% else %>
     <p>Log in to join this beerclub</p>
   <% end %>