code: def many(cls, filter=None, **kwargs):
          
          from mongoframes.queries import Condition, Group, to_refs
  
          # Flatten the projection
          kwargs['projection'], references, subs = \
                  cls._flatten_projection(
                      kwargs.get('projection', cls._default_projection)
                      )
  
          # Find the documents
          if isinstance(filter, (Condition, Group)):
              filter = filter.to_dict()
  
          documents = list(cls.get_collection().find(to_refs(filter), **kwargs))
  
          # Dereference the documents (if required)
          if references:
              cls._dereference(documents, references)
  
          # Add sub-frames to the documents (if required)
          if subs:
              cls._apply_sub_frames(documents, subs)
  
          return [cls(d) for d in documents]
docs: Return a list of documents matching the filter