From: eregontp@...
Date: 2018-07-12T12:29:22+00:00
Subject: [ruby-core:87927] [Ruby trunk Bug#14909] Method call with object that has to_hash method crashes (method with splat and keyword arguments)

Issue #14909 has been updated by Eregon (Benoit Daloze).


At least, it behaves the same if passing a keyword arguments directly:

~~~ruby
def my_func(*objects, error_code: 400)
  objects.inspect
end
my_func(to_hash_key: "to_hash") # => unknown keyword: to_hash_key (ArgumentError)
~~~

So this has nothing to do with the `to_hash` conversion.

One way to workaround this is:

~~~ruby
def my_func(*objects, error_code: 400, **kwargs)
  kwargs
end
p my_func(to_hash_key: "to_hash") # => {:to_hash_key=>"to_hash"}
~~~

So adding a keyrest argument (**kwargs), because there is already a keyword argument which means keywords have to fit in the declared keyword args, unless there is a keyrest arg.

----------------------------------------
Bug #14909: Method call with object that has to_hash method crashes (method with splat and keyword arguments)
https://bugs.ruby-lang.org/issues/14909#change-72936

* Author: johannes_luedke (Johannes L��dke)
* Status: Feedback
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin17]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
In a method with a splat method argument followed by a keyword argument, it leads to an `ArgumentError` when calling the method with an object that reacts to `to_hash`


~~~ruby
def my_func(*objects, error_code: 400)
  objects.inspect
end

class Test
  def to_hash
    # an example hash
    { to_hash_key: "to_hash" }
  end
end

my_func(Test.new)
~~~

Observed result: an exception is raised: `in my_func: unknown keyword: to_hash_key (ArgumentError)` 
Expected result: `[#<Test:0x007fc8c9825318>]` is returned by the `my_func` call

It should behave the same when calling with objects that have a `to_hash` method and objects that don't, shouldn't it?



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