add rpc method

    All metas must share the same metadata set.

    """

    # prevent mixing metas from different sets

    # id, value

    metadatasets_ids = []

    for meta_dict in metas:

        meta = Metadata.objects.get(pk=meta_dict["id"])

    return True

@_rpc_groups(["Metadatas", "Collections"])

def set_metas_to_collection(user: User, collection_id: int, metas: List[dict]) -> bool:

    """

    Sets all metas for a unique metadata set.

    Metas is metadata id => metadata value dictionary.

    All metas must share the same metadata set.

    """

    # prevent mixing metas from different sets

    metadatasets_ids = []

    for meta_dict in metas:

        meta = Metadata.objects.get(pk=meta_dict["id"])

        metadatasets_ids.append(meta.set.pk)

    metadatasets_ids = list(set(metadatasets_ids))

    if len(metadatasets_ids) > 1:

        raise ServiceException(

            "can't mix metadata sets when setting multiple meta values at once"

        )

    # check that objects exist

    collection_instance = Collection.objects.filter(

        pk=collection_id, deleted_at__isnull=True

    ).first()

    if not collection_instance:

        raise ServiceException("no such collection")

    metadataset_instance = MetadataSet.objects.filter(pk=metadatasets_ids[0]).first()

    if not metadataset_instance:

        raise ServiceException("no such metadatas set")

    # remove all metas from the set

    for meta_value in collection_instance.metadatacollectionvalue_set.filter(

        metadata__set=metadataset_instance

    ):

        remove_meta_from_collection(user, collection_id, meta_value.metadata.pk)

    # add metas

    for meta_dict in metas:

        add_meta_to_collection(user, collection_id, meta_dict["id"], meta_dict["value"])

    return True

@_rpc_groups(["Metadatas", "Resources"])

def add_meta_to_resource(

    user: User, resource_id: int, meta_id: int, meta_value: str