Rails 6 has dropped name from ActiveRecord::ConnectionAdapters::ForeignKeyDefinition for Sqlite3 adapter: https://github.com/rails/rails/blob/f2df77709f7e536aaf4d6f984ff21a49d44d34c1/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb\#L305-L311 This has caused issues with getting foreign key info and blowing up when trying to annotate models with foreign keys. This commit adds one additional check for name presence and uses column attribute from options instead. Closes #620.
