Скачать или смотреть How to Retrieve Top Rated Products in Laravel with Average Rating Equal to 5

Discover how to efficiently get all products with an average rating of 5 in Laravel using Eloquent relationships. This guide includes code snippets and explanations.
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Get All Products with Average Rating Equal to 5 in Laravel

If you're working with products and reviews in a Laravel application, you might find yourself needing to display a list of top-rated products. Specifically, you might want to retrieve products that have an average rating of exactly 5. This task can be tackled using Laravel's Eloquent ORM and its powerful querying capabilities. In this guide, we will explore how to achieve this step by step.

Understanding the Database Structure

Before diving into the solution, let's review the tables we're working with:

Products Table: This table stores all the product information.

Reviews Table: This table contains reviews for each product, including ratings by users.

Relationships

Products have many Reviews.

Reviews belong to a Product.

This relationship setup allows us to easily query reviews associated with each product.

Step-by-Step Guide to Retrieve Top Rated Products

Step 1: Setup Your Product Query

To start with, we want to retrieve all products along with their associated reviews. The following Eloquent query achieves this:

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

Here, we are fetching all products with their associated category and reviews. The with function optimizes the query by eager loading related models, reducing the number of database calls.

Step 2: Calculate Average Ratings

To filter products based on their average ratings, we can apply a few techniques. The initial approach makes use of a left join with an aggregate function to compute average ratings directly in the query:

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

Breakdown of The Code:

leftJoin: This allows us to join the reviews table with products, ensuring we can calculate the average ratings.

DB::raw: Used to define a raw SQL expression for average calculation.

groupBy: Groups results by product ID to ensure we get one record per product.

having: This filters results to only include products where the average rating equals 5.

Step 3: Alternative Approach: Filter after Retrieval

If you prefer or find it easier to get all products with their reviews first, you can filter the fetched collection as follows:

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

Here’s what this code does:

filter: This method allows you to apply a condition to a collection post-retrieval.

The closure (inside the filter) checks if the average rating of each product equals 5.

Conclusion

In this post, we discussed how to retrieve products ranked as the best based on their average ratings using Laravel. With either the direct SQL approach using leftJoin or filtering your collection after fetching all products, you can easily display those highly-rated items in your application.

Next time you're developing a Laravel application and need to showcase top-rated products, you can confidently implement these strategies to meet your needs.

Feel free to dive deeper into Laravel’s documentation for more insights, and happy coding!