How to Efficiently Perform Sum Aggregations with GroupBy in Laravel Eloquent?

Sum Aggregation with GroupBy in Laravel Eloquent

Introduction:
Laravel's Eloquent ORM provides a convenient way to retrieve and manipulate data from a database. When working with large datasets, it becomes necessary to group data and perform aggregations such as sums.

Problem Statement:
The provided code attempts to calculate the sum of no_of_pages grouped by users_editor_id using Eloquent's sum() and groupBy() methods. However, this approach fails due to the fact that sum() executes the query and returns the result before groupBy() can be applied.

Solution:

To resolve this issue, we can use a combination of groupBy() and selectRaw() methods. Here's an updated solution:

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

Explanation:

• groupBy('users_editor_id'): Groups the rows by the users_editor_id column.
• selectRaw('sum(no_of_pages) as sum, users_editor_id'): Adds a new column named sum to the result, which contains the sum of no_of_pages for each group.
• pluck('sum','users_editor_id'): Retrieves the sum and users_editor_id values and returns them as an array.

Alternative Solution:

Another approach is to use the selectRaw() method along with get() to return a collection of pseudo-ORM models:

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

This method adds the sum column to each resulting model, allowing you to access it like a regular model property.

Conclusion:

By utilizing the groupBy(), selectRaw(), and pluck() methods, we can efficiently perform sum aggregations with grouping in Laravel Eloquent. These techniques enable us to handle large datasets effectively and retrieve valuable insights from the data.

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