Introduce User#lower_userid to avoid arel

app/models/authenticator/base.rb

@@ -244,7 +244,7 @@ def failure_reason(_username, _request)
 
  def case_insensitive_find_by_userid(username)
  user = User.lookup_by_userid(username)
- user || User.in_my_region.where('lower(userid) = ?', username.downcase).order(:lastlogon).last
+ user || User.in_my_region.where(:lower_userid => username.downcase).order(:lastlogon).last
  end
 
  def userid_for(_identity, username)

app/models/user.rb

@@ -115,6 +115,13 @@ def self.lookup_by_lower_email(email, cache = [])
  singleton_class.send(:alias_method, :find_by_lower_email, :lookup_by_lower_email)
  Vmdb::Deprecation.deprecate_methods(singleton_class, :find_by_lower_email => :lookup_by_lower_email)
 
+ def lower_userid
+ userid&.downcase
+ end
+
+ virtual_attribute :lower_userid, :string, :arel => ->(t) { t.grouping(t[:userid].lower) }
+ hide_attribute :lower_userid
+
  virtual_column :ldap_group, :type => :string, :uses => :current_group
  # FIXME: amazon_group too?
  virtual_column :miq_group_description, :type => :string, :uses => :current_group
@@ -333,7 +340,7 @@ def regional_users
  end
 
  def self.regional_users(user)
- where(arel_table.grouping(Arel::Nodes::NamedFunction.new("LOWER", [arel_attribute(:userid)]).eq(user.userid.downcase)))
+ where(:lower_userid => user.userid.downcase)
  end
 
  def self.super_admin

lib/token_store/sql_store.rb

@@ -47,7 +47,7 @@ def session_key(token)
  end
 
  def find_user_by_userid(userid)
- User.in_my_region.where('lower(userid) = ?', userid.downcase).first
+ User.in_my_region.where(:lower_userid => userid.downcase).first
  end
 
  def find_user_by_id(id)

tools/miq_config_sssd_ldap/configure_database.rb

@@ -74,7 +74,7 @@ def dn_to_upn(userid)
 
  def find_user(userid)
  user = User.lookup_by_userid(userid)
- user || User.in_my_region.where('lower(userid) = ?', userid).order(:lastlogon).last
+ user || User.in_my_region.where(:lower_userid => userid).order(:lastlogon).last
  end
  end
 end