Question: After grouping a df by 'user id' and then getting the average rating by users, how do I add the average ratings as a column

After grouping a df by 'user id' and then getting the average rating by users, how do I add the average ratings as a column to the original data frame?

My codes so far are:

avgrat_df = rat_df.groupby(['user id'])['rating'].agg(["mean"])

avgrat_df.sort_values(by='mean', ascending=False).head(10)

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