Append item to Mongo Array

I have a mongodb document I am trying to update. This answer was helpful, but every time I insert into the database, the data is inserted as an array inside of the array whereas I just want to insert the object directly into the array.

Here is what I am doing.

# My function to update the array
def append_site(gml_id, new_site):
    col.update_one({'gml_id': gml_id}, {'$push': {'websites': new_site}}, upsert = True)

# My Dataframe
data = {'name':['ABC'], 
        'gml_id':['f9395e09'],
        'url':['ABC.com']
        }
df = pd.DataFrame(data)

# Grouping data for upsert
df = df.groupby(['gml_id']).apply(lambda x: x[['name','url']].to_dict('r')).reset_index().rename(columns={0:'websites'})

# Apply function to every row
df.apply(lambda row: append_site(row['gml_id'], row['websites']), axis = 1)

Here is the outcome:

{
    "gml_id": "f9395e09",
    "websites": [
        {
            "name": "XYZ.com",
            "url": "...xyz.com"
        },
        [
            {
                "name": "ABC.com",
                "url": "...abc.com"
            }
        ]
    ]
}

Here is the goal:

{
    "gml_id": "f9395e09",
    "websites": [
        {
            "name": "XYZ.com",
            "url": "...xyz.com"
        },
        {
            "name": "ABC.com",
            "url": "...abc.com"
        }
    ]
}

Copyright Notice：Content Author:「Mike」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/62824967/append-item-to-mongo-array