Login modal using default rails ajax request not working with subdomains

I am having a devise user model.

To login I am using twitter-bootstrap modal.The modal is by default
hidden and shown only after an rails default ajax request is send to the
server.

It works fine with localhost and production. But when a user is on a
subdomain(using acts_as_tenant) like business.lvh.me:3000 the modal
window does not pop up and the ajax request fails.

I am sharing the session across all the domains.

My SessionStore initializer.

Rails.application.config.session_store :active_record_store, :key =>
‘_my_app_session’,domain: ‘lvh.me

PFB the error.log for the same.

Rendered remote_content/_remote_sign_up.html.erb (78.8ms)
Rendered remote_content/remote_sign_up.js.erb (86.2ms)
Security warning: an embedded tag on another site requested
protected JavaScript. If you know what you’re doing, go ahead and
disable forgery protection on this action to permit cross-origin
JavaScript embedding.
Completed 422 Unprocessable Entity in 100ms (Views: 96.1ms |
ActiveRecord: 1.6ms)

ActionController::InvalidCrossOriginRequest - Security warning: an
embedded tag on another site requested protected JavaScript. If
you know what you’re doing, go ahead and disable forgery protection on
this action to permit cross-origin JavaScript embedding.:
actionpack (4.2.4)
lib/action_controller/metal/request_forgery_protection.rb:225:in
verify_same_origin_request' activesupport (4.2.4) lib/active_support/callbacks.rb:432:inblock in
make_lambda’
activesupport (4.2.4) lib/active_support/callbacks.rb:239:in block in halting' activesupport (4.2.4) lib/active_support/callbacks.rb:506:inblock in
call’
activesupport (4.2.4) lib/active_support/callbacks.rb:506:in call' activesupport (4.2.4) lib/active_support/callbacks.rb:92:inrun_callbacks
activesupport (4.2.4) lib/active_support/callbacks.rb:778:in
_run_process_action_callbacks' activesupport (4.2.4) lib/active_support/callbacks.rb:81:inrun_callbacks’
actionpack (4.2.4) lib/abstract_controller/callbacks.rb:19:in
process_action' actionpack (4.2.4) lib/action_controller/metal/rescue.rb:29:inprocess_action’
actionpack (4.2.4)
lib/action_controller/metal/instrumentation.rb:32:in block in process_action' activesupport (4.2.4) lib/active_support/notifications.rb:164:inblock in instrument’
activesupport (4.2.4)
lib/active_support/notifications/instrumenter.rb:20:in instrument' activesupport (4.2.4) lib/active_support/notifications.rb:164:ininstrument’
actionpack (4.2.4)
lib/action_controller/metal/instrumentation.rb:30:in process_action' actionpack (4.2.4) lib/action_controller/metal/params_wrapper.rb:250:inprocess_action’
activerecord (4.2.4)
lib/active_record/railties/controller_runtime.rb:18:in process_action' actionpack (4.2.4) lib/abstract_controller/base.rb:137:inprocess’
actionview (4.2.4) lib/action_view/rendering.rb:30:in process' actionpack (4.2.4) lib/action_controller/metal.rb:196:indispatch’
actionpack (4.2.4)
lib/action_controller/metal/rack_delegation.rb:13:in dispatch' actionpack (4.2.4) lib/action_controller/metal.rb:237:inblock in
action’
actionpack (4.2.4) lib/action_dispatch/routing/route_set.rb:76:in
dispatch' actionpack (4.2.4) lib/action_dispatch/routing/route_set.rb:45:inserve’
actionpack (4.2.4) lib/action_dispatch/journey/router.rb:43:in block in serve' actionpack (4.2.4) lib/action_dispatch/journey/router.rb:30:inserve’
actionpack (4.2.4) lib/action_dispatch/routing/route_set.rb:821:in
call' warden (1.2.3) lib/warden/manager.rb:35:inblock in call’
warden (1.2.3) lib/warden/manager.rb:34:in call' rack (1.6.4) lib/rack/etag.rb:24:incall’
rack (1.6.4) lib/rack/conditionalget.rb:25:in call' rack (1.6.4) lib/rack/head.rb:13:incall’
actionpack (4.2.4)
lib/action_dispatch/middleware/params_parser.rb:27:in call' actionpack (4.2.4) lib/action_dispatch/middleware/flash.rb:260:incall’
rack (1.6.4) lib/rack/session/abstract/id.rb:225:in context' rack (1.6.4) lib/rack/session/abstract/id.rb:220:incall’
actionpack (4.2.4) lib/action_dispatch/middleware/cookies.rb:560:in
call' activerecord (4.2.4) lib/active_record/query_cache.rb:36:incall’
activerecord (4.2.4)
lib/active_record/connection_adapters/abstract/connection_pool.rb:653:in
call' activerecord (4.2.4) lib/active_record/migration.rb:377:incall’
actionpack (4.2.4) lib/action_dispatch/middleware/callbacks.rb:29:in
block in call' activesupport (4.2.4) lib/active_support/callbacks.rb:88:inrun_callbacks
activesupport (4.2.4) lib/active_support/callbacks.rb:778:in
_run_call_callbacks' activesupport (4.2.4) lib/active_support/callbacks.rb:81:inrun_callbacks’
actionpack (4.2.4) lib/action_dispatch/middleware/callbacks.rb:27:in
call' actionpack (4.2.4) lib/action_dispatch/middleware/reloader.rb:73:incall’
actionpack (4.2.4) lib/action_dispatch/middleware/remote_ip.rb:78:in
call' better_errors (2.1.1) lib/better_errors/middleware.rb:84:inprotected_app_call’
better_errors (2.1.1) lib/better_errors/middleware.rb:79:in
better_errors_call' better_errors (2.1.1) lib/better_errors/middleware.rb:57:incall’
actionpack (4.2.4)
lib/action_dispatch/middleware/debug_exceptions.rb:17:in call' web-console (2.2.1) lib/web_console/middleware.rb:39:incall’
actionpack (4.2.4)
lib/action_dispatch/middleware/show_exceptions.rb:30:in call' railties (4.2.4) lib/rails/rack/logger.rb:38:incall_app’
railties (4.2.4) lib/rails/rack/logger.rb:20:in block in call' activesupport (4.2.4) lib/active_support/tagged_logging.rb:68:inblock in tagged’
activesupport (4.2.4) lib/active_support/tagged_logging.rb:26:in
tagged' activesupport (4.2.4) lib/active_support/tagged_logging.rb:68:intagged’
railties (4.2.4) lib/rails/rack/logger.rb:20:in call' request_store (1.2.0) lib/request_store/middleware.rb:8:incall’
actionpack (4.2.4) lib/action_dispatch/middleware/request_id.rb:21:in
call' rack (1.6.4) lib/rack/methodoverride.rb:22:incall’
rack (1.6.4) lib/rack/runtime.rb:18:in call' activesupport (4.2.4) lib/active_support/cache/strategy/local_cache_middleware.rb:28:incall’
rack (1.6.4) lib/rack/lock.rb:17:in call' actionpack (4.2.4) lib/action_dispatch/middleware/static.rb:116:incall’
rack (1.6.4) lib/rack/sendfile.rb:113:in call' railties (4.2.4) lib/rails/engine.rb:518:incall’
railties (4.2.4) lib/rails/application.rb:165:in call' rack (1.6.4) lib/rack/content_length.rb:15:incall’
puma (2.9.2) lib/puma/server.rb:490:in handle_request' puma (2.9.2) lib/puma/server.rb:361:inprocess_client’
puma (2.9.2) lib/puma/server.rb:254:in block in run' puma (2.9.2) lib/puma/thread_pool.rb:92:inblock in spawn_thread’

Sorry to tell you, but this behavior is by design. You’ll have to put it
on the same subdomain as the accessed page or use a workaround like an
API. This is actually a limitation of AJAX.