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rails--rails/activesupport
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Daniel Colson 4e646bb281
Allow subscribing with a single argument callable 
Fixes #39976

Prior to this commit it was possible to pass a single argument block to
`ActiveSupport::Notifications.subscribe`, rather than 5 separate
arguments:

```rb
ActiveSupport::Notifications.subscribe('some_event') do |event|
  puts "Reacting to #{event.name}"
end
```

But it was not possible to do the same with a lambda, since the lambda
parameter is a required (`:req`) parameter, but we were checking only
for an optional (`:opt`) parameter.

```rb
listener = ->(event) do
  puts "Reacting to #{event.name}"
end

ActiveSupport::Notifications.subscribe('some_event', &listener)
```

It was also not possible to do this with a custom callable object, since
the custom callable does not respond directly to `:parameters` (although
it's `:call` method object does).

```rb
class CustomListener
  def call(event)
    puts "Reacting to #{event.name}"
  end
end

ActiveSupport::Notifications.subscribe('some_event', CustomListener.new)
```

Prior to this commit these examples would have raised `ArgumentError:
wrong number of arguments (given 5, expected 1)`.

With this commit the single argument lambda and custom callable work
like the single argument block.
2020-11-09 22:26:21 -05:00
..
bin
lib Allow subscribing with a single argument callable 2020-11-09 22:26:21 -05:00
test Allow subscribing with a single argument callable 2020-11-09 22:26:21 -05:00
.gitignore
activesupport.gemspec Don't make rexml an dependency of activesupport 2020-09-24 22:41:04 +00:00
CHANGELOG.md disable compression for MemoryStore's by default 2020-11-04 12:20:24 -05:00
MIT-LICENSE Bump license years from 2019 to 2020 [ci skip] 2020-01-01 15:10:31 +05:30
Rakefile allow running each test with pure ruby path/to/test.rb 2019-12-18 08:49:19 -06:00
README.rdoc Update the Rails mailing list URLs to new discuss discourse URL [ci skip] 2020-04-02 22:00:28 +05:30

README.rdoc 

= Active Support -- Utility classes and Ruby extensions from Rails

Active Support is a collection of utility classes and standard library
extensions that were found useful for the Rails framework. These additions
reside in this package so they can be loaded as needed in Ruby projects
outside of Rails.

You can read more about the extensions in the {Active Support Core Extensions}[https://edgeguides.rubyonrails.org/active_support_core_extensions.html] guide.

== Download and installation

The latest version of Active Support can be installed with RubyGems:

  $ gem install activesupport

Source code can be downloaded as part of the Rails project on GitHub:

* https://github.com/rails/rails/tree/master/activesupport


== License

Active Support is released under the MIT license:

* https://opensource.org/licenses/MIT


== Support

API documentation is at:

* https://api.rubyonrails.org

Bug reports for the Ruby on Rails project can be filed here:

* https://github.com/rails/rails/issues

Feature requests should be discussed on the rails-core mailing list here:

* https://discuss.rubyonrails.org/c/rubyonrails-core