Public profile endorsements (accounts picked by profile owner) (#8146)

app/models/account_pin.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+# == Schema Information
+#
+# Table name: account_pins
+#
+#  id                :bigint(8)        not null, primary key
+#  account_id        :bigint(8)
+#  target_account_id :bigint(8)
+#  created_at        :datetime         not null
+#  updated_at        :datetime         not null
+#
+
+class AccountPin < ApplicationRecord
+  include RelationshipCacheable
+
+  belongs_to :account
+  belongs_to :target_account, class_name: 'Account'
+
+  validate :validate_follow_relationship
+
+  private
+
+  def validate_follow_relationship
+    errors.add(:base, I18n.t('accounts.pin_errors.following')) unless account.following?(target_account)
+  end
+end