ruby on rails - syntax error, unexpected ',', expecting => ...| u.permit( roles: [], :email,:password, :password

i using gem 'devise' in project. difference between these 2 lines of code :

 devise_parameter_sanitizer.for(:sign_up)  { |u| u.permit( :email, :password, :password_confirmation, roles: [] ) }

and

devise_parameter_sanitizer.for(:sign_up)  { |u| u.permit(roles: [], :email, :password, :password_confirmation ) }

because when tried second 1 getting error:

syntax error, unexpected ',', expecting => ...| u.permit( roles: [], :email,:password, :password_confirma... ... ^

ruby has special syntax sugar argument, hash. must pass last.

this

u.permit( :email, :password, :password_confirmation, roles: [] )

essentially means this

u.permit( :email, :password, :password_confirmation, { roles: [] } )

in second example, you're trying pass first argument, confuses ruby parser. use first form.

Brant