Add action AccountsController#show

app/controllers/accounts_controller.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+class AccountsController < ApplicationController
+  before_action :set_account
+
+  # GET /accounts/:username
+  def show
+    authorize @account
+  end
+
+private
+
+  def set_account
+    @account = Account.find_by! username: params[:username]
+  end
+end

app/models/account.rb

@@ -34,6 +34,10 @@ class Account < ApplicationRecord
 
   validates :biography, length: { maximum: 10_000 }
 
+  def to_param
+    username
+  end
+
   def guest?
     user.nil?
   end

app/policies/account_policy.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class AccountPolicy < ApplicationPolicy
+  def show?
+    true
+  end
+end

app/views/accounts/show.html.erb

@@ -0,0 +1,9 @@
+<div class="container">
+  <div class="row">
+    <div class="col-md-3">
+      <p class="h4 text-muted"><%= @account.username %></p>
+    </div>
+    <div class="col-md-9">
+    </div>
+  </div>
+</div>

config/routes.rb

@@ -13,6 +13,8 @@ Rails.application.routes.draw do
   get  :join,        to: 'membership_apps#new'
   post :join,        to: 'membership_apps#create'
 
+  resources :accounts, param: :username, only: :show
+
   resources :country_states, only: %i[index show]
 
   ###############

spec/models/account_spec.rb

@@ -39,6 +39,12 @@ RSpec.describe Account do
   pending '#guest?'
   pending '#can_access_sidekiq_web_interface?'
 
+  describe '#to_param' do
+    specify do
+      expect(subject.to_param).to eq subject.username
+    end
+  end
+
   describe '#username' do
     def allow_value(*)
       super.for :username

spec/policies/account_policy_spec.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe AccountPolicy do
+  subject { described_class.new account, record }
+
+  let!(:record) { create :personal_account }
+
+  for_account_types nil, :guest, :usual, :superuser do
+    it { is_expected.to permit_action :show }
+
+    it { is_expected.to forbid_action :index }
+    it { is_expected.to forbid_new_and_create_actions }
+    it { is_expected.to forbid_edit_and_update_actions }
+    it { is_expected.to forbid_action :destroy }
+  end
+end

spec/requests/accounts/show_spec.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe 'GET /accounts/:username' do
+  let!(:account_record) { create :personal_account }
+
+  before do
+    sign_in current_account.user if current_account&.user
+    get "/accounts/#{account_record.username}"
+  end
+
+  for_account_types nil, :guest, :usual, :superuser do
+    specify do
+      expect(response).to have_http_status :ok
+    end
+  end
+end