From my understanding

config/environments/development.rb

# Show full error reports.
config.consider_all_requests_local = true

should show the full trace stack when an error occurs in development.

However, when I start the server in development

web | => Booting Puma
web | => Rails 7.1.5.1 application starting in development
web | => Run `bin/rails server --help` for more startup options
web | Puma starting in single mode...
web | * Puma version: 6.6.0 ("Return to Forever")
web | * Ruby version: ruby 3.3.7 (2025-01-15 revision be31f993d7) [x86_64-darwin22]
web | *  Min threads: 5
web | *  Max threads: 5
web | *  Environment: development
web | *          PID: 7727
web | * Listening on :3000
web | Use Ctrl-C to stop

and an error occurs, I get

with no trace neither in the console

web |   Session Load (1.3ms)  SELECT "sessions".* FROM "sessions" WHERE "sessions"."id" = $1 ORDER BY created_at DESC LIMIT $2  [["id", 101444], ["LIMIT", 1]]
web |   ↳ app/controllers/application_controller.rb:64:in `set_session'
web | Completed 500 Internal Server Error in 216ms (ActiveRecord: 52.6ms | Allocations: 54411)

Am I missing something here?

UPDATE 1

def set_session
  Current.session = Session.find_by(id: session[:id])
end

UPDATE 2

sig@mbp myapp % bin/rails c
Loading development environment (Rails 7.1.5.1)
irb(main):001> Rails.application.config.consider_all_requests_local
=> true

UPDATE 3

 ↳ app/controllers/application_controller.rb:64:in `set_session'
show_detailed_exceptions: true"
[4, 13] in ~/Code/myapp/app/controllers/sessions_controller.rb
     4|
     5|   layout 'login'
     6|
     7|   def new
     8|     p show_detailed_exceptions: #{request.get_header("action_dispatch.show_detailed_exceptions")}"
=>   9|     debugger do: "break ActionDispatch::DebugExceptions#render_exception"
    10|     here_the_error
    11|   end
    12|
    13|   def create
=>#0    SessionsController#new at ~/Code/myapp/app/controllers/sessions_controller.rb:9
  #1    ActionController::BasicImplicitRender#send_action(method="new", args=[]) at ~/.rbenv/versions/3.3.7/lib/ruby/gems/3.3.0/gems/actionpack-7.1.5.1/lib/action_controller/metal/basic_implicit_render.rb:6
  # and 82 frames (use `bt' command for all frames)
(rdbg:#debugger) break ActionDispatch::DebugExceptions#render_exception
duplicated breakpoint:  BP - Method  ActionDispatch::DebugExceptions#render_exception at /Users/sig/.rbenv/versions/3.3.7/lib/ruby/gems/3.3.0/gems/web-console-3.7.0/lib/web_console/extensions.rb:27

UPDATE 4

I added a print to the following files

# lib/action_dispatch/middleware/show_exceptions.rb
def render_exception(request, wrapper)
  p "I RENDER EXCEPTION IN SHOW"

  [ORIGINAL CODE]
end

# lib/action_dispatch/middleware/debug_exceptions.rb
def render_exception(request, exception, wrapper)
  p "I RENDER EXCEPTION IN DEBUG"

  [ORIGINAL CODE]
end

Then, when I hit the error, I get the following:

Processing by SessionsController#new as HTML
  Session Load (2.0ms)  SELECT "sessions".* FROM "sessions" WHERE "sessions"."id" = $1 ORDER BY created_at DESC LIMIT $2  [["id", 101452], ["LIMIT", 1]]
  ↳ app/controllers/application_controller.rb:64:in `set_session'
"======> true"
  User Load (3.1ms)  SELECT "users".* FROM "users" WHERE "users"."id" = $1 ORDER BY name LIMIT $2  [["id", 2], ["LIMIT", 1]]
  ↳ app/controllers/application_controller.rb:29:in `current_user'
Completed 500 Internal Server Error in 267ms (ActiveRecord: 23.4ms | Allocations: 34184)


"I RENDER EXCEPTION IN SHOW"

I reached the "wrong" render_exception