Namespaced models in belongs to with counter cache set

If a namespaced model is referenced in the belongs_to that has a counter_cache => true then the counter cache column name is not properly inferred from the class.

This is an issue during a reassign of the belongs_to association.

>> post = Web::Post.create
=> #<Web::Post id: 1, title: nil, comments_count: nil>
>> post.comments.create
=> #<Web::Comment id: 1, post_id: 1, comment: nil>
>> post.reload
=> #<Web::Post id: 1, title: nil, comments_count: 1>
>> comment = post.comments.first
=> #<Web::Comment id: 1, post_id: 1, comment: nil>
>> comment.post = nil
ActiveRecord::StatementInvalid: SQLite3::SQLException: no such column: web/comments_count: UPDATE "posts" SET "web/comments_count" = COALESCE("web/comments_count", 0) - 1 WHERE ("id" = 1)