Devise config modification based on subdomain / request - ruby-on-rails

Question

I'm wondering how I can go about something like this in the devise config.rb.
if request.subdomain == 'app'
config.case_insensitive_keys = [:username]
elsif request.subdomain == 'support'
config.case_insensitive_keys = [:email]
end
The use here is that I want system users to only be able to login with their employee_id's (username) because their email addresses can appear across multiple accounts so I needed a way to log them in and register without the devise email validations catching them, however I want the backend group to login only by email (me and future devs) as there should never be more than one user there with multiple emails
this is failing when I try to drop my database for some reason?
STACK TRACE
/Users/taurenltd/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activerecord-6.0.2.2/lib/active_record/type.rb:27: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/Users/taurenltd/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activerecord-6.0.2.2/lib/active_record/type/adapter_specific_registry.rb:9: warning: The called method `add_modifier' is defined here
rails aborted!
SyntaxError: /Users/taurenltd/Desktop/Development/roadze-base/config/initializers/devise.rb:301: syntax error, unexpected end-of-input, expecting `end'
/Users/taurenltd/Desktop/Development/roadze-base/config/environment.rb:5:in `<main>'
/Users/taurenltd/Desktop/Development/roadze-base/bin/rails:9:in `<top (required)>'
/Users/taurenltd/Desktop/Development/roadze-base/bin/spring:15:in `<top (required)>'
bin/rails:3:in `load'
bin/rails:3:in `<main>'
Tasks: TOP => db:drop => db:load_config => environment
(See full trace by running task with --trace)
taurenltd#Shawns-MBP roadze-base % rails db:drop db:create db:migrate
/Users/taurenltd/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activerecord-6.0.2.2/lib/active_record/type.rb:27: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
/Users/taurenltd/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/activerecord-6.0.2.2/lib/active_record/type/adapter_specific_registry.rb:9: warning: The called method `add_modifier' is defined here
rails aborted!
NameError: undefined local variable or method `request' for main:Object
Did you mean? require
/Users/taurenltd/Desktop/Development/roadze-base/config/initializers/devise.rb:55:in `block in <main>'
/Users/taurenltd/Desktop/Development/roadze-base/config/initializers/devise.rb:5:in `<main>'
/Users/taurenltd/Desktop/Development/roadze-base/config/environment.rb:5:in `<main>'
/Users/taurenltd/Desktop/Development/roadze-base/bin/rails:9:in `<top (required)>'
/Users/taurenltd/Desktop/Development/roadze-base/bin/spring:15:in `<top (required)>'
bin/rails:3:in `load'
bin/rails:3:in `<main>'

Answer 1

Got this working by using the following block
def self.matches?(request)
if request.subdomain.present? && request.subdomain == 'app'
config.case_insensitive_keys = [:username]
elsif request.subdomain.present && request.subdomain == 'support'
config.case_insensitive_keys = [:email]
end
end