Issue #15829 has been reported by foonlyboy (Eike Dierks).

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

* Author: foonlyboy (Eike Dierks)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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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:

```
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:

```
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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