Issue #15829 has been updated by ko1 (Koichi Sasada).

Status changed from Open to Rejected

It seems difficult to introduce.

if you are interest about this ticket yet, could you reopen it and file on our dev-meeting agenda?
https://bugs.ruby-lang.org/issues/15996

Thanks.

----------------------------------------
Feature #15829: Object#then_if(condition){}
https://bugs.ruby-lang.org/issues/15829#change-80158

* Author: foonlyboy (Eike Dierks)
* Status: Rejected
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
I'd like to propose some sugar to Object#then

There should be `Object#then_if(condition, &block)`
 
The block should only be applied when the condition is true,
otherwise the object should be returned without applying the block.

Rationale:

I frequently use `Object#then` with Rails to extend queries like this:

```ruby
foo.then {|query|
  if(condition)
   query.where(zip:zap)
  else
   query
  end
}
```

by using the proposed `Object#then_if` the example could be simplified to:

```ruby
foo.then_if(condition) {|query|
   query.where(zip:zap)
}
```

I believe that this also applies to a lot of other use cases,
i.e. only applying some transformation if some condition is true,
but otherwise leaving the result untouched.















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