Fix preview paths

[JonRowe]

On Rails 7.1 they changed the preview path setup for mailers to be multiple rather than singular, this PR handles that change conditionally in the railtie and fixes our test setup around the mailers. Fixes #2703.

[JonRowe]

/cc @alexevanczuk

[ryanb]

@JonRowe Won't this fail with Rails 7.2+? Would it be better to do a >= comparison?

[alexevanczuk]

Hey @JonRowe let me know if this is something that you're still working on or if I can help out!

[TylerRick]

Can you please make a release that includes this? 🙏

The current release (6.0.3) does not include this, and is therefore not compatible with Rails 7.1 (when using config.active_support.disallowed_deprecation = :raise, as some of us do). 😞

[TylerRick]

A related question: While waiting for a release, is there an easy way to use the edge/unreleased version?

I tried gem 'rspec-rails', github: 'rspec/rspec-rails' but run into this error (unless I also explicitly list every rspec sub-project in my Gemfile):

Could not find gem 'rspec-mocks (= 3.13.0.pre)', which is required by gem 'rspec-rails', in rubygems repository https://rubygems.org/ or
installed locally.

[dannyy83]

@TylerRick I'm in the same situation as you, and this works for me:

  %w[rspec-core rspec-expectations rspec-mocks rspec-rails rspec-support].each do |lib|
    gem lib, git: "https://github.com/rspec/#{lib}.git", branch: 'main'
  end

[TylerRick]

@TylerRick I'm in the same situation as you, and this works for me:

  %w[rspec-core rspec-expectations rspec-mocks rspec-rails rspec-support].each do |lib|
    gem lib, git: "https://github.com/rspec/#{lib}.git", branch: 'main'
  end

Thanks, @dannyy83, and glad to hear I'm not alone. I landed on something similar. Too bad you have to override all of those dependencies, but I guess it makes sense, due to the version constraint on "= 3.13.0.pre)".

[JonRowe]

Fix released in 6.1.0 for Rails 7.1 support.

Side note, if you depend on the <major>-<minor>-maintenance branch you shouldn't need to pin the rest of RSpec, but we only tend to ship bugfixes to those.