The average rating returned not correct.

[Dennis Mwea]

Am thinking the average rating should be a waited average. Not the average rating of total columns in the database. Something like:

∑𝑛𝑖=1𝑤𝑖⋅𝑎𝑖
----------
∑𝑛𝑖=1𝑤𝑖


1⋅5+2⋅3+3⋅1+4⋅17+5⋅2.         92 -       (Weighted sum)
-------------------------- = ---- 
5+3+1+17+2                    28      -  (Total sum)

[Alexander G.]

Does this mean that your model rated twice the same rateable model? This seems a flaw.

[Dennis Mwea]

Not really. I have 3 models, User, Order and Courier (Courier delivery DB structure). A User can rate a Courier based on the Order he delivered. Assuming the 5 users rate the courier with a rating of 5 for 2 users, 3 for 2 users and 1 for one user, the courier rating can't be 5/5 but rather (total weighted sum/total weights)

(5*2) + (3*2) + (1*1)/(2+2+1)=3.4

https://math.stackexchange.com/questions/1909716/average-in-a-rating-between-1-and-5

[Alexander G.]

Based on your example, it seems like the table with ratings looks like:

• 5
• 5
• 3
• 3
• 1

The sum is 17, with total rows of 5. The expected average is 17/5 which is equivalent to 3.4.

This seems a bit odd. Pulling the ratings are expected to be working with the ->avg() call.

Did you calculate the rating from the user's side? Did you call the average rating call like this?

$user->averageRating();
$user->averageRating(Courier::class); 

[Dennis Mwea]

No I pulled the changes from Courier side. $courier->averageRating(User::class) but the value I get is the average rating from db average not the weighted average

[stale]

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