Prevent user from sending a friend request to themselves

:w

@@ -0,0 +1,45 @@
+class User < ApplicationRecord
+  # Include default devise modules. Others available are:
+  # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
+  devise :database_authenticatable, :registerable,
+         :recoverable, :rememberable, :validatable
+
+  validates :name, presence: true, length: { maximum: 20 }
+
+  has_many :friendships
+  has_many :friends, through: :friendships
+  has_many :inverse_friendships, class_name: "Friendship", foreign_key: "friend_id"
+  has_many :posts
+  has_many :comments, dependent: :destroy
+  has_many :likes, dependent: :destroy
+
+  def pending
+    self.status = 'p'
+  end
+
+  def friends
+    friends_array = friendships.map{ |friendship| friendship.friend if friendship.status == 'a' }
+    friends_array.compact
+  end
+
+  def confirm_friend(user)
+    friendship = inverse_friendships.find{ |friendship| friendship.user == user }
+    friendship.status = 'a'
+    friendship.save
+  end
+
+  def friend?(user)
+    friends.include?(user)
+  end
+
+  def pending_friends
+    friends_array = friendships.map{ |friendship| friendship.friend if !friendship.status = 'p' }
+    friends_array.compact
+  end
+
+  def reject_friend(user)
+    friendship = inverse_friendships.find{ |friendship| friendship.user == user }
+    friendship.status = 'r'
+    friendship.save
+  end
+end

app/controllers/users_controller.rb

@@ -3,12 +3,21 @@ class UsersController < ApplicationController
   before_action :authenticate_user!
 
   def index
-    @users = User.all
+    @users = User.find_by_sql(["SELECT * FROM users WHERE id != ? ", current_user.id])
   end
 
   def show
     @user = User.find(params[:id])
     @posts = @user.posts.ordered_by_most_recent
   end
-
+
+  def follow_user
+    user_id = params[:user_id]
+    if Friendship.create(user_id: current_user.id, friend_id: user_id)
+      flash[:success] = "Request Sent"
+    else
+      flash[:danger] = "Failure to send request"
+    end
+    redirect_to users_path
+  end
 end

app/models/friendship.rb

@@ -1,4 +1,6 @@
 class Friendship < ApplicationRecord
   belongs_to :user
   belongs_to :friend, class_name: "User"
+
+  validates_uniqueness_of :user_id, scope: :friend_id
 end

app/models/user.rb

@@ -13,6 +13,10 @@ class User < ApplicationRecord
   has_many :comments, dependent: :destroy
   has_many :likes, dependent: :destroy
 
+  def pending
+    self.status = 'p'
+  end
+
   def friends
     friends_array = friendships.map{ |friendship| friendship.friend if friendship.status == 'a' }
     friends_array.compact

app/views/users/index.html.erb

@@ -7,6 +7,10 @@
           <%= link_to 'See Profile',  user_path(user), class: 'profile-link' %>
         </span>
         <%= send_button(user.id) %>
+        <%= form_tag follow_user_path, method: :post do %>
+          <%= hidden_field_tag :user_id, user.id %>
+          <%= submit_tag "Request", class: 'btn btn-primary btn-sm' %>
+        <% end %>
       </li>
     <% end %>
   </ul>

config/routes.rb

@@ -9,7 +9,7 @@
     resources :comments, only: [:create]
     resources :likes, only: [:create, :destroy]
   end
-
+  post "follow/user" => "users#follow_user", as: :follow_user
   post 'send_invitation' => 'users#send_invitation'
   # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
 end