adds restore user action for administrators

app/controllers/admin/users_controller.rb

@@ -0,0 +1,25 @@
+class Admin::UsersController < Admin::BaseController
+
+  def index
+    @users = User.only_hidden.page(params[:page])
+  end
+
+  def show
+    @user = User.with_hidden.find(params[:id])
+    @debates = Debate.where(author_id: @user.id).with_hidden.page(params[:page])
+    @comments = Comment.where(user_id: @user.id).with_hidden.page(params[:page])
+  end
+
+  def restore
+    user = User.with_hidden.find(params[:id])
+    if hidden_at = user.hidden_at
+      debates_ids = Debate.only_hidden.where(author_id: user.id).where("debates.hidden_at > ?", hidden_at).pluck(:id)
+      comments_ids = Comment.only_hidden.where(user_id: user.id).where("comments.hidden_at > ?", hidden_at).pluck(:id)
+
+      user.restore
+      Debate.restore_all debates_ids
+      Comment.restore_all comments_ids
+    end
+    redirect_to admin_users_path, notice: t('admin.users.restore.success')
+  end
+end