Add basics of Follower feature

app/models/profile.rb

@@ -1,4 +1,8 @@
 class Profile < ActiveRecord::Base
   belongs_to :user
   has_many :social_links
+  has_many :passive_relationships, class_name:  "Relationship",
+                                  foreign_key:  "followed_id",
+                                    dependent:  :destroy
+  has_many :followers, through: :passive_relationships, source: :follower
 end

app/models/relationship.rb

@@ -0,0 +1,6 @@
+class Relationship < ActiveRecord::Base
+  belongs_to :follower, class_name: "User"
+  belongs_to :followed, class_name: "Profile"
+  validates :follower_id, presence: true
+  validates :followed_id, presence: true
+end

app/models/user.rb

@@ -7,6 +7,11 @@ class User < ActiveRecord::Base
   has_many :doodads
   has_many :projects
   has_many :profiles
+  has_many :active_relationships, class_name:  "Relationship",
+                                 foreign_key:  "follower_id",
+                                   dependent:  :destroy
+  has_many :following, through: :active_relationships, source: :followed
+
 
   def icid
     stp = SoftTokenPrincipal.where(soft_token: self.soft_token).first_or_initialize
@@ -100,4 +105,20 @@ class User < ActiveRecord::Base
   # :confirmable, :lockable, :timeoutable and :omniauthable
   devise :invitable, :database_authenticatable, :registerable,
          :recoverable, :rememberable, :trackable, :validatable
+
+  # Follows a user.
+  def follow(leader)
+    active_relationships.create(followed_id: leader.id)
+  end
+
+  # Unfollows a user.
+  def unfollow(leader)
+    active_relationships.find_by(followed_id: leader.id).destroy
+  end
+
+  # Returns true if the current user is following the leader.
+  def following?(leader)
+    following.include?(leader)
+  end
+
 end

app/views/profiles/index.html.haml

@@ -17,6 +17,7 @@
         - profile.social_links.each do |social_link|
           = social_link.to_icon.html_safe
       %p= profile.about
+      %span #{profile.followers.count} Followers
       - if policy(profile).destroy?
         = link_to 'Edit', edit_profile_path(profile)
         = link_to 'Delete', profile, method: :delete, data: { confirm: 'Are you sure?' }

app/views/profiles/show.html.haml

@@ -22,3 +22,5 @@
     %h2 About #{@profile.name}
     %p= @profile.about
 
+.stats
+  %p #{@profile.followers.count} Followers

app/views/shared/_stats.html.haml

@@ -0,0 +1,10 @@
+- @user ||= current_user
+.stats
+  %a{:href => "#{following_user_path(@user)}"}
+    %strong#following.stat
+      = @user.following.count
+    following
+  -# %a{:href => "#{followers_user_path(@user)}"}
+    %strong#followers.stat
+      = @user.followers.count
+    followers

app/views/users/show.html.erb

@@ -1,3 +1,7 @@
 <h3>User</h3>
 <p>Name: <%= @user.display_name if @user.display_name %></p>
 <%# <p>Email: <%= @user.email if @user.email %1></p> %>
+
+<section class="stats">
+  <%= render 'shared/stats' %>
+</section>

config/routes.rb

@@ -54,7 +54,6 @@ Rails.application.routes.draw do
   get '/play-now', to: 'tables#play_now', as: 'play_now'
   get '/tutorial', to: 'tables#tutorial', as: 'tutorial'
   devise_for :users, controllers: { registrations: "users/registrations" }
-  resources :users
   get '/loaderio-456644f4db1fcd1e8578be882d2fc476.txt', to: redirect('/assets/loaderio-456644f4db1fcd1e8578be882d2fc476.txt')
   get '/loaderio-eb4afd672bf5b9af467fbadcba243f26.txt', to: redirect('/assets/loaderio-eb4afd672bf5b9af467fbadcba243f26.txt')
   get '/calls', to: 'calls#root'
@@ -62,4 +61,9 @@ Rails.application.routes.draw do
   resources :calls, only: :create
   mount ActionCable.server, at: '/cable'
   resources :rooms, only: [:new, :create, :show]
+  resources :users do
+    member do
+      get :following
+    end
+  end
 end

db/migrate/20231109015600_create_relationships.rb

@@ -0,0 +1,13 @@
+class CreateRelationships < ActiveRecord::Migration[6.1]
+  def change
+    create_table :relationships do |t|
+      t.integer :follower_id
+      t.integer :followed_id
+
+      t.timestamps
+    end
+    add_index :relationships, :follower_id
+    add_index :relationships, :followed_id
+    add_index :relationships, [:follower_id, :followed_id], unique: true
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2023_11_07_161251) do
+ActiveRecord::Schema.define(version: 2023_11_09_015600) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -115,6 +115,16 @@ ActiveRecord::Schema.define(version: 2023_11_07_161251) do
     t.index ["user_id"], name: "index_projects_on_user_id"
   end
 
+  create_table "relationships", force: :cascade do |t|
+    t.integer "follower_id"
+    t.integer "followed_id"
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+    t.index ["followed_id"], name: "index_relationships_on_followed_id"
+    t.index ["follower_id", "followed_id"], name: "index_relationships_on_follower_id_and_followed_id", unique: true
+    t.index ["follower_id"], name: "index_relationships_on_follower_id"
+  end
+
   create_table "seats", force: :cascade do |t|
     t.integer "table_id"
     t.integer "user_id"

spec/factories/relationships.rb

@@ -0,0 +1,6 @@
+FactoryGirl.define do
+  factory :relationship do
+    follower_id 1
+    followed_id 1
+  end
+end

spec/models/relationship_spec.rb

@@ -0,0 +1,5 @@
+# require 'rails_helper'
+
+# RSpec.describe Relationship, type: :model do
+#   pending "add some examples to (or delete) #{__FILE__}"
+# end