How to Correctly Sum and GroupBy in Laravel Eloquent?

Laravel Eloquent: Mastering the Art of Summing with GroupBy

When working with Laravel Eloquent, there are times when you need to calculate the sum of a specific column while grouping the results by another column. However, using the conventional approach of sum() followed by groupBy() can lead to an error. This is because sum() executes the query immediately, leaving no object to apply groupBy() on.

The Answer: Skilled Solution for Grouping and Summing

To tackle this issue, the solution is to use the following code structure:

Document::groupBy('users_editor_id')
    ->selectRaw('sum(no_of_pages) as sum, users_editor_id')
    ->pluck('sum','users_editor_id');

This code groupBy() on the 'users_editor_id' column, then uses selectRaw() to specify the sum calculation. Finally, pluck() extracts the sum and users_editor_id` values into an array.

Alternatively, you can use this approach:

Document::groupBy('users_editor_id')
    ->selectRaw('*, sum(no_of_pages) as sum')
    ->get();

This method returns a collection of Document models with an additional sum field, providing a slightly different representation of the grouped data.

Conclusion

By understanding the interplay between groupBy() and sum() and leveraging the selectRaw() method, you can effortlessly calculate sums while grouping results in Laravel Eloquent, empowering your data analysis capabilities.

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