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Bug #15515

closed

OpenStruct raising NoMethodError instead of ArgumentError

Added by lugray (Lisa Ugray) about 3 years ago. Updated almost 3 years ago.

Status:
Closed
Priority:
Normal
Target version:
-
ruby -v:
ruby 2.7.0dev (2019-01-07 trunk 66747) [x86_64-darwin18]
[ruby-core:90918]

Description

When an OpenStruct has some attribute foo, calling the foo method with an argument gives a no method error:

foo = OpenStruct.new(bar: 'baz')
foo.bar(0) # => NoMethodError (undefined method `bar' for #<OpenStruct bar="baz">)

This is confusing, since foo.respond_to?(:bar) # => true. I would expect:

foo = OpenStruct.new(bar: 'baz')
foo.bar(0) # => ArgumentError (wrong number of arguments (given 1, expected 0))

The included fixes this, and adjusts the arity ArgumentError for the setter to be in line with the default arity messaging too.


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