Скачать или смотреть Overriding ActiveRecord::Base Destroy Method for Soft Deletion in Rails

Discover how to properly override the `ActiveRecord::Base` destroy method in Rails to implement soft deletion without running into argument errors.
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This video is based on the question https://stackoverflow.com/q/77523855/ asked by the user 'Justice Hirschi' ( https://stackoverflow.com/u/14068705/ ) and on the answer https://stackoverflow.com/a/77527306/ provided by the user 'Les Nightingill' ( https://stackoverflow.com/u/451893/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Overriding the ActiveRecord::Base Destroy Method for Soft Deletion in Rails

In Rails applications, managing records in the database is often handled by Active Record, where each record typically represents a row in a database table. One common requirement for managing records is the need to soft delete them. This means that instead of completely removing a record from the database, we merely mark it as deleted, allowing it to be restored later if necessary.

In this guide, we will explore how to override the destroy method in a class that inherits from ActiveRecord::Base, focusing on soft deletion functionality while addressing a common issue related to argument handling errors.

The Problem

You have a class, such as Rule, which inherits from ActiveRecord::Base, and you want to customize the built-in destroy method to allow soft deletion when an option is passed. Here’s a simplified version of your attempt:

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

When calling destroy without parameters, you encounter an error that states:

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Why Does This Error Occur?

The main reason for this error is that when you use super in Ruby, it automatically forwards any arguments that were received in the current method. In this case, calling destroy without parameters tries to pass soft: false to super, which is incorrect, as the original ActiveRecord::Base#destroy does not accept any arguments.

The Solution

To resolve this issue, you need to modify how you call super in your overridden destroy method. By explicitly calling super() without any arguments, you can avoid the argument error. Here’s the revised implementation:

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

Breakdown of the Solution

Soft Parameter Handling: The method accepts an optional keyword argument soft. By default, it's set to false.

Conditional Logic:

If soft is true, it calls the soft_delete method to handle the soft deletion logic.

If soft is false, it calls the original destroy method using super() to ensure no arguments are passed through.

Avoiding Argument Errors: By calling super() with empty parentheses, you explicitly indicate that you do not wish to pass any arguments to the superclass implementation, thus avoiding the argument error.

Conclusion

Overriding methods in Ruby on Rails can introduce complexities, especially when dealing with method arguments. By understanding how Ruby's super works in conjunction with your method parameters, you can confidently implement custom logic like soft deletion without running into common pitfalls.

If you've been trying to work with soft deletes in your Rails application, give the above solution a try. It might just solve the problem you’ve been facing with the destroy method!