Allow to search for user by secondary email address in the admin interface

It is not possible to search for a user by his secondary email address in
the Users search bar in the admin interface(/admin/users). A use-case could
 be that an admin wants to remove a specific secondary email address of an
user, because it interferes with another user. Issue #23761

This commit adds ability to search not only by main email, but also
by any secondary email in the admin interface.

2 files changed, 19 insertions, 1 deletions

diff --git a/app/controllers/admin/users_controller.rb b/app/controllers/admin/users_controller.rb
index 57efa899694..bb912ed10cc 100644
--- a/app/controllers/admin/users_controller.rb
+++ b/app/controllers/admin/users_controller.rb
@@ -3,7 +3,7 @@ class Admin::UsersController < Admin::ApplicationController
 
   def index
     @users = User.order_name_asc.filter(params[:filter])
-    @users = @users.search(params[:search_query]) if params[:search_query].present?
+    @users = @users.search_with_secondary_emails(params[:search_query]) if params[:search_query].present?
     @users = @users.sort(@sort = params[:sort])
     @users = @users.page(params[:page])
   end
diff --git a/app/models/user.rb b/app/models/user.rb
index e2a97c3a757..af3c0b7dc02 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -258,6 +258,24 @@ class User < ActiveRecord::Base
       )
     end
 
+    # searches user by given pattern
+    # it compares name, email, username fields and user's secondary emails with given pattern
+    # This method uses ILIKE on PostgreSQL and LIKE on MySQL.
+
+    def search_with_secondary_emails(query)
+      table = arel_table
+      email_table = Email.arel_table
+      pattern = "%#{query}%"
+      matched_by_emails_user_ids = email_table.project(email_table[:user_id]).where(email_table[:email].matches(pattern))
+
+      where(
+        table[:name].matches(pattern).
+          or(table[:email].matches(pattern)).
+          or(table[:username].matches(pattern)).
+          or(table[:id].in(matched_by_emails_user_ids))
+      )
+    end
+
     def by_login(login)
       return nil unless login