Ruby - Optional argument wrong match

Question

I have a ruby function with the following signature:

def botao_adicionar(model, prefix = "/#{model.name.tableize}", callback = nil)

and I want to make it a call without pass the prefix argument, so it takes the default from function that I defined above. So I call it this way:

botao_adicionar(model=ArrendamentoContrato, callback="bind_unidades_consumidoras()")

And it associates the callback value to prefix variable. I believe it's matching by the order of arguments, but I explicitly called the name of the argument in the function call... that shouldn't work? Thanks!

Andrey Deineko · Answer 1 · 2016-10-31T15:37:13.500

1

You can use keyword arguments:

def botao_adicionar(model, prefix: "/#{model.name.tableize}", callback: nil)
end

Usage:

botao_adicionar(ArrendamentoContrato, callback: "bind_unidades_consumidoras()")

edited Oct 31 '16 at 15:37

answered Oct 31 '16 at 15:31

Andrey Deineko

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Almost, but not quite :) – Sergio Tulentsev Oct 31 '16 at 15:36
@SergioTulentsev with `model` it was a typo - thx for noticing :) – Andrey Deineko Oct 31 '16 at 15:37

score 1 · Accepted Answer · answered Oct 31 '16 at 15:36

1

All your arguments are positional. Meaning that you can't assign them by name.

It seems that you want to use keyword arguments. The correct syntax for them is this:

def botao_adicionar(model, prefix: "/#{model.name.tableize}", callback: nil)

And then

botao_adicionar(ArrendamentoContrato, callback: "bind_unidades_consumidoras()")

answered Oct 31 '16 at 15:36

Sergio Tulentsev

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Thanks! That's exactly what I mean... didn't knew it was syntax error. Thank you! – Ronan Lopes Oct 31 '16 at 16:04
@RonanLopes: it's not syntax error. Just inadequate syntax for what you were trying to do :) – Sergio Tulentsev Oct 31 '16 at 16:10

Ruby - Optional argument wrong match

2 Answers2