Check both Sequel and Sequel::Model are defined.

[mikeastock]

This resolves a conflict of using this gem with rodauth-rails and using ActiveRecord.

Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Related Issue	Fix #...
Need Doc update	no

Describe your change

Adds checks for Sequel::Model being defined.

What problem is this fixing?

While using this gem and rodauth-rails at the same time you get an

NameError (uninitialized constant Sequel::Model):

error because rodauth-rails loads Sequel but not Sequel::Model

[mikeastock]

CI failures seem to be unrelated to this change

[DevinCodes]

Hey @mikeastock , thank you for the contribution.

The CI failing is indeed linked to something else, no need to worry about it 😉
The PR looks good to me, I'll try to get a release out this week with this fix. I'll leave a comment on this PR once that's done.

Cheers!

[DevinCodes]

Thanks again @mikeastock , this has been released in version 2.2.2: https://rubygems.org/gems/algoliasearch-rails/versions/2.2.2