fields.py 文件源码

def generate_edges_page(ndb_iter, page_size, keys_only, edge_type):
    edges = []
    timeouts = 0
    while len(edges) < page_size:
        try:
            entity = ndb_iter.next()
        except StopIteration:
            break
        except Timeout:
            timeouts += 1
            if timeouts > 2:
                break

            continue
        except DeadlineExceededError:
            break

        if keys_only:
            # entity is actualy an ndb.Key and we need to create an empty entity to hold it
            entity = edge_type._meta.fields['node']._type._meta.model(key=entity)

        edges.append(edge_type(node=entity, cursor=ndb_iter.cursor_after().urlsafe()))

    return edges