Issue #14059 has been updated by shevegen (Robert A. Heiler).
Perhaps it could be an Array input for Module#refinements?
There he could perhaps specify the classes that are to be
modified. So the above example would then be:
refine [NilClass, Array, Hash] do
def positive_integer?
false
end
end
instead.
http://ruby-doc.org/core-2.4.2/Module.html#method-i-refine
But I know too little about refinements and also too little
about what Kevin wants to achieve, aside from him using
less syntax for batch-modification, which I think is
understandable. :)
----------------------------------------
Feature #14059: Refine multiple classes in one call
https://bugs.ruby-lang.org/issues/14059#change-67612
* Author: kddeisz (Kevin Deisz)
* Status: Open
* Priority: Normal
* Assignee:
* Target version:
----------------------------------------
Consider the following problem - I would like to be able to validate that a JSON string contains all things that can represent positive integers. In this case, it works well with refinements, because I can:
~~~
class PositiveJSONValidator < ActiveModel::EachValidator
using Module.new {
refine String do
def positive_integer?
match?(/[1-9](?:[0-9])*/)
end
end
refine Integer do
def positive_integer?
self > 0
end
end
refine Float do
def positive_integer?
self == self.to_i
end
end
refine NilClass do
def positive_integer?
false
end
end
refine Array do
def positive_integer?
false
end
end
refine Hash do
def positive_integer?
false
end
end
}
def validate_each(record, attribute, value)
return if valid_positive_json?(value)
record.errors[attribute] << options[:message] || 'is invalid'
end
private
def valid_positive_json?(value)
JSON.parse(value).all? do |key, value|
key.positive_integer? && value.positive_integer?
end
rescue JSON::ParserError
false
end
end
~~~
However, this is kind of annoying because I need to specify each class manually. What I'd love to be able to do is group classes by passing all of the ones that need to be refined in the same way, as in:
~~~
refine NilClass, Array, Hash do
def positive_integer?
false
end
end
~~~
Is this something that people would consider? It seems like a good use case for refinements because I just want to send a message to an object, so basically I want a default case. I could just refine Object but that feels wrong, I'd rather get an undefined method exception so that I know something unexpected occurred. If accepted I'd be happy to submit a patch.
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