Скачать или смотреть How to Aggregate a Column in One Model Grouped by Another Model in Laravel: An Eloquent Guide

Discover how to effectively aggregate sales data by manufacturer in Laravel using Eloquent relationships and raw SQL queries.
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How to Aggregate a Column in One Model Grouped by Another Model in Laravel: An Eloquent Guide

If you’re working with Laravel and Eloquent, you may have encountered the need to aggregate data across different models. This can be particularly daunting when you want to group your results based on a column from a related model. In this guide, we will explore how to accomplish this using a simple example involving a product master and a sales transaction table.

Understanding the Scenario

Imagine you have two database tables:

Products Table

prod_id

Prod Name

Manufacturer

Sales Table

prod_id

qty_sold

selling_price

In Laravel, you already have established a relationship in your Product model that links it to the Sales model.

[[See Video to Reveal this Text or Code Snippet]]

The Problem

You want to execute an Eloquent query that summarizes the sales quantities, grouped by the manufacturer of each product. Furthermore, you are interested in knowing if you can run a similar query from the Sale model to get aggregates grouped by the manufacturer's name from the Product model.

Solution Breakdown

To resolve this, we can utilize Eloquent’s powerful query building capabilities along with some raw SQL. Below we’ll break down the solutions.

Aggregating Sales Quantity Grouped by Manufacturer

Using DB Facade with Raw SQL:

To get the desired output, we can use the DB::table() method combined with a leftJoin(). Here’s how you can do this:

[[See Video to Reveal this Text or Code Snippet]]

Explanation:

This code performs a left join between the products and sales tables using the prod_id as the common column.

We then SELECT the manufacturer and the SUM of the qty_sold as total_qty_sold.

Finally, we group the results by manufacturer to ensure we get a total for each unique manufacturer.

Using Eloquent:

You can also achieve the same result directly through the Eloquent model like this:

[[See Video to Reveal this Text or Code Snippet]]

Note: Here, we are leveraging Eloquent’s fluent interface to retrieve data while grouping them based on the manufacturer.

Getting Aggregates from the Sale Model

If you want to run a query from the Sale model to get aggregates grouped by the manufacturers, you can utilize a subquery or a more complex join. However, the most straightforward method is to fit it into the above query framework.

Here’s how it would look:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following the methods outlined in this post, you can easily aggregate and summarize data across related models in Laravel using Eloquent and raw SQL queries. This allows you to gain insights into your data without much hassle. Whether you use DB queries or Eloquent’s powerful features, understanding how to manage relationships and aggregate data can greatly enhance your Laravel applications.

With these techniques, you're now equipped to tackle data aggregation challenges with confidence. Happy coding!