Can only add a friend one time

app/controllers/friendships_controller.rb

@@ -10,10 +10,10 @@ class FriendshipsController < ApplicationController
 
     if @friendship.save
       flash[:notice] = 'Added friend.'
-      redirect_to root_url
+      redirect_to friendships_path
     else
       flash[:notice] = 'Unable to add friend.'
-      redirect_to root_url
+      redirect_to users_path
     end
   end
 

app/controllers/users_controller.rb

@@ -4,5 +4,12 @@ class UsersController < ApplicationController
   end
 
   def show
+    @user = User.find(params[:id])
+  end
+
+  private
+
+  def user_params
+    params.permit(:id)
   end
 end

app/models/friendship.rb

@@ -1,4 +1,6 @@
 class Friendship < ActiveRecord::Base
   belongs_to :user
   belongs_to :friend, class_name: 'User'
+
+  validates_uniqueness_of :friend_id, :scope => :user_id
 end

app/views/friendships/index.html.erb

@@ -1,4 +1,4 @@
-<h2>Listing friendships</h2>
+<h2>Friends List</h2>
 
 <table class="table table-striped table-hover">
   <thead>
@@ -13,7 +13,7 @@
   <tbody>
     <% @friendships.each do |friendship| %>
       <tr>
-        <td><%= friendship.friend.name %></td>
+        <td><%= link_to friendship.friend.name, friendship.friend %></td>
         <td><%= friendship.created_at %></td>
         <td><%= friendship.updated_at %></td>
         <td>[ <%= link_to 'Destroy', friendship, method: :delete,

app/views/users/show.html.erb

@@ -1,2 +1,4 @@
-<h1>User#show</h1>
-<p>Find me in app/views/user/show.html.erb</p>
+<h2><%= @user.name %></h2>
+Friends: <%= @user.friends.count %><br/>
+Created: <%= @user.created_at %><br/>
+Updarted: <%= @user.updated_at %><br/>