Fix rubocop offenses on generated files

[Nicolás Alonso]

**Is your feature request related to a problem? Please describe.**

After a scaffold with `rails g scaffold Post name short_description large_description:text position:integer` then i run `rubocop --parallel` and found a lot of offenses.

I have identified:

- Layout/EmptyLinesAroundBlockBody

- Layout/EmptyLines 

- Style/BlockDelimiters

- Layout/SpaceInsideHashLiteralBraces

- Style/HashSyntax

- Layout/IndentFirstArgument

- Layout/IndentFirstArrayElement

- Style/StringLiterals

- FrozenStringLiteralComment

**Describe the solution you'd like**

I would like that the generated files don't have rubocop offenses

**Describe alternatives you've considered**

I have considered turning off some crops but i think is not the way.

I have some time to do this, if you are ok i'll start in the order that i have mentioned the offenses.

Which branch should be my base? I think that some offenses can be from version 3 and other ones like `Style/HashSyntax` needs to be from master

**Additional context**

rails: 5.2.3

ruby: 2.6.5

rspec-rails 4.0.0.pre

[Philipp Pirozhkov]

Hey Nicolás

Thanks for reporting this.

Since RuboCop configuration varies from project to project, it would be impossible to come up with a template that would fit all the style combinations.

Do you think it makes sense to adjust the template in rspec-rails (I suggest it's coming from it) to appease the default RuboCop/RuboCop-RSpec configurations?

If one's project's RuboCop configuration is non-default, I believe it would be possible to override the templates in your project. This makes most sense if you actively use scaffolds.

Also, there's an option in `rubocop` to `--auto-correct` all the offences. I've seen people using scripts to also pass a list of files in the git working tree to `rubocop` and reduce its auto-correction to only this set of files.

- Phil

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