Скачать или смотреть How to Join Tables and Sum Amount in Laravel for User Transactions

Learn how to efficiently join tables and calculate total amounts of transactions for users in Laravel, enhancing your application’s performance and readability with Eloquent ORM.
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Join Tables and Sum Amount in Laravel

When working with relational databases in Laravel, it's common to face a scenario where you need to manipulate data spread across multiple tables. In this guide, we will tackle the problem of summing transaction amounts associated with users from two different tables: users and transactions. We'll go through how to effectively join these tables and calculate the total amount each user has received minus the total amount sent.

Understanding the Data Structure

We have two tables:

Users Table

id: Unique identifier for each user.

name: The name of the user.

Example:

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

Transactions Table

id: Unique identifier for each transaction.

amount: The amount of money involved in the transaction.

send_id: The user id who sent the amount.

receive_id: The user id who received the amount.

Example:

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

The Goal

We need to calculate the net total for each user based on the transactions:

Each user should have a total that represents the amount received minus the amount sent.

For example:

User name1: 32 (received) - 30 (sent) = 2.

We want the output in the following format:

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

The Solution

To achieve this in Laravel, there are multiple approaches. Let's dive into two effective solutions using Eloquent ORM.

1. Eloquent Relationships with Appended Attributes

If you have models for your tables, you can set up relationships in your User model and use appended attributes to calculate totals.

Step-by-step Implementation:

Define Relationships in the User Model:

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

Calculate the Total:

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

Fetch Users with Their Total Amount:

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

Output the Result:
You can use dd($users); to check the result.

2. Direct Total Calculation Method

Alternatively, instead of appending the total, you could define a method in your User model for calculating the total on demand.

Step-by-step Implementation:

Define the Relationships as shown previously.

Add a Method for Total Calculation:

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

Accessing the Total Calculation:
Whenever you need to get the total, simply call:

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

Conclusion

Both of the outlined methods allow you to neatly handle transactions between users in Laravel. By using Eloquent's powerful ORM capabilities, you can maintain a clear and efficient codebase while executing complex database operations.

Feel free to experiment with these methods and find out which one suits your project's needs better. Happy coding!