Rails 7.1 allows ErrorReporter to handle several error classes

railsNovember 07, 2023Dotby Alkesh Ghorpade

ErrorReporter was added to Rails in version 7.0. It was introduced as a way to provide a more consistent and standardized way to handle errors in the Rails applications.

To use ErrorReporter, you need to call the Rails.error.handle method whenever an error occurs. This method will log the error and notify the appropriate error handlers. You can also use ErrorReporter to raise custom errors.

Before Rails 7.1

Before Rails 7.0, developers had to write their own custom code to handle errors. This was done using the begin..rescue..end block.

# to handle a single error
begin
  code_that_raises_exception
rescue ArgumentError => e
  puts e.message
end   

# to handle multiple errors
exceptions = [ArgumentError, StandarError]

begin
  code_that_raises_argument_error
  code_that_raises_standard_error
rescue *exceptions => e
  puts "Error: #{e.message} occurred."
end

Rails 7 introduced the Rails.error. The handle method would only accept or deal with an error of a particular type.

@post = Post.new(params[:post])

Rails.error.handle(ActiveRecord::Errors) do
  @post.save!
end

If you try to pass multiple error handlers to the above method, it will raise ArgumentError as below:

@post = Post.new(params[:post])

Rails.error.handle(ActiveRecord::Errors, StandardError) do
  @post.save!
end

=> wrong number of arguments (given 2, expected 0..1) (ArgumentError)

In Rails 7.1

Rails 7.1 allows ErrorReporter to handle several error classes.

@post = Post.new(params[:post])

Rails.error.handle(ActiveRecord::Errors, StandardError) do
  @post.save!
end

The example code will run without generating any errors. Any error class not passed to the handle function will not be handled.

Rails.error.handle(IOError, ArgumentError) do
  139 + 'abc' # raises TypeError
end

TypeError is not passed as an argument to the handle function, 139 + 'abc' will not be rescued, and TypeError gets raised.

To know more about this feature, please refer to this PR.

Closing Remark

Could your team use some help with topics like this and others covered by ShakaCode's blog and open source? We specialize in optimizing Rails applications, especially those with advanced JavaScript frontends, like React. We can also help you optimize your CI processes with lower costs and faster, more reliable tests. Scraping web data and lowering infrastructure costs are two other areas of specialization. Feel free to reach out to ShakaCode's CEO, Justin Gordon, at [email protected] or schedule an appointment to discuss how ShakaCode can help your project!
Are you looking for a software development partner who can
develop modern, high-performance web apps and sites?
See what we've doneArrow right