Add support for calling create on an association

[danielgranat]

Failure/Error: c = myKindel.ebooks.create!(:name => "book1")
NoMethodError:
undefined method `create!' for []:Array

This is the way it does work:
c1 = Ebook.create!(:name => "book1", :kindel_id => myKindel.id )
c2 = Ebook.create!(:name => "book2", :kindel_id => myKindel.id)
myKindel.ebooks = [c1,c2]

[jwood]

This is currently not supported, but would definitely be a great addition. Marking it as a feature.

[arjan0307]

It also seems that post.comments.build is not working as expected.
Where comment is a mongoid model. It creates a comment, but it doesn't set the comment's post_id to post.id.

[jwood]

build is also not supported. The full list of supported methods on Tenacity associations can be found at http://rubydoc.org/github/jwood/tenacity/Tenacity/ClassMethods.

Pull requests are always welcome :-)