Is there a way to check if particular method signature is present in Ruby?
For example I want to call
thing.make(env: @@__ENV__, apiKey: "myKey")
if I do this check
if thing.respond_to? 'make'
I can end up with the error
ArgumentError: unknown keyword: :apiKey
Is there a way to check that there is the particular make(env:,apiKey:) method and not just make with any arguments
Simplest thing to do is try it and rescue the ArgumentError.
begin
thing.make(env: @@__ENV__, apiKey: "myKey")
rescue ArgumentError => e
...guess not...
end
You can also introspect the parameters of the Method object. This returns an Array of Arrays like [[:key, :env], [:key, :apiKey]] . You're looking for :key if its optional, :keyreq if it's required.
params = thing.method(:make).parameters
p [:env,:apiKey].all? { |arg|
params.include?([:key,arg]) || params.include?([:keyreq, arg])
}
If you have to do this as part of application code, you may want to reconsider your design.