When using Slim in Ruby on Rails, "undefined local variable or method` f'for "is displayed in form_with

Development environment

Ruby: v2.5.7 Rails: v5.2.4.4 gem slim: v4.1.0

error contents

= form_with model:@team, local:true do |f|

= render 'layouts/error_message', model: f.object

.input
  = f.label :name
  = f.text_field :name

.input
  = f.label :introduction
  = f.text_area :introduction

  = f.submit

This time, I introduced slim which is one of the Gem of Ruby on Rails, but I got an error immediately. The content is With NameError undefined local variable or method f' for #<#<Class:0x00007fef406b53c8>:0x00007fef35880668>

It means that the specified f is not defined. Even though the block variable described in form_with says f ... I wondered if there was a way to write form_with peculiar to slim, so I was researching various things. As a result, it was solved by correcting as follows.

= form_with model: @team, local: true do |f|

/Each paragraph indented
  = render 'layouts/error_message', model: f.object

  .input
    = f.label :name
    = f.text_field :name

  .input
    = f.label :introduction
    = f.text_area :introduction

    = f.submit

It was an indentation adjustment ... it's simple to understand ...

I didn't need ʻend or () `, so I was wondering how to determine the scope of application of form_with, but it is identified by indentation. So that's it... I noticed through this error. Lol

It's a simple thing, but I'm addicted to it, so I'll post it.

Even so, it takes some getting used to, but even if you don't need a few descriptions and parentheses, the description is considerably simplified and the code is easy to write and easy to read. In addition, it seems that rendering is a little faster, so it's just a good point, slim.