Whe I use a table that has some a virtual field sqlform.grid does not works

<type 'exceptions.AttributeError'> 'Row' object has no attribute 'unknown'

and that happens only when the virtual field is uncommented

def get_category_list(post):
    category_id_list =  db(db.Post_in_category.post_id == post.id).select(db
.Post_in_category.category_id)
    category_list = []
    for category_id in category_id_list:
        category_list.append(db.Category[category_id["category_id"]])
    return category_list

db.Post.category_list = Field.Virtual(
    lambda row: get_category_list(row.Post)
)



what am I doing wrong?

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