Nested scaffold should be fine #30729
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Currently, namespaced scaffold generator will generate an incorrect path
and the generated file will not work properly.
```
$ ./bin/rails g scaffold admin/user
$ ./bin/rails db:migrate
$ ./bin/rails t test/controllers
# Running:
E
Error:
Admin::UsersControllerTest#test_should_create_admin_user:
NameError: undefined local variable or method `admin_admin_users_url' for #<Admin::UsersControllerTest:0x000055a59f25ff68>
Did you mean? admin_users
test/controllers/admin/users_controller_test.rb:20:in `block (2 levels) in <class:UsersControllerTest>'
test/controllers/admin/users_controller_test.rb:19:in `block in <class:UsersControllerTest>'
bin/rails test test/controllers/admin/users_controller_test.rb:18
```
This is because combine `controller_class_path` and `singular_table_name`
to generate route.
https://github.com/rails/rails/blob/360698aa245b45349d1d1b12e1afb34759515e69/railties/lib/rails/generators/named_base.rb#L172
Normally, if using namspaced generator, table name already contains
namespace. Therefore, adding `controller_class_path` adds extra namespace.
Since it is special only when explicitly specifying `model-name`, it is
modified to change the value only when `model-name`is specified.
Follow up of rails#30729
Summary
I run
$ ./bin/rails g scaffold_conroller admin/users --model-name=UserIts works fine but redirect or link url is wrong.
I fixed it.