From: Ryan Davis <ryand-ruby@...>
Date: 2008-08-14T03:17:45+09:00
Subject: Re: array in ruby


On Aug 13, 2008, at 11:02 , Leonard Yera wrote:

> hello list
>
> I have this array, in irb I write @mercados
> it puts this
>
> [[#<Mercado id: 1, nombre: "Ibex 35", descripcion: "", simbolo:  
> "^IBEX",
> created_at: "2008-08-13 10:22:42", updated_at: "2008-08-13  
> 10:22:42">],
> [#<Mercado id: 1, nombre: "Ibex 35", descripcion: "", simbolo:  
> "^IBEX",
> created_at: "2008-08-13 10:23:39", updated_at: "2008-08-13  
> 10:23:39">],
> [#<Mercado id: 1, nombre: "Ibex 35", descripcion: "", simbolo:  
> "^IBEX",
> created_at: "2008-08-13 10:23:55", updated_at: "2008-08-13  
> 10:23:55">],
> [#<Mercado id: 2, nombre: "Nasdaq", descripcion: "", simbolo: "",
> created_at: "2008-08-13 17:39:27", updated_at: "2008-08-13  
> 17:39:27">]]
>
> if I write @mercados[1] it puts
>
> #<Mercado id: 1, nombre: "Ibex 35", descripcion: "", simbolo: "^IBEX",
> created_at: "2008-08-13 10:23:39", updated_at: "2008-08-13 10:23:39">]

No. You're not seeing (or writing above) the extra "[". You have an  
array of arrays of mercados, not an array of mercados. You need to  
either flatten before you access, access 2 levels deep, or assign your  
top level array differently so you don't have the extra nesting  
(assuming it serves no purpose).

@mercados.flatten[0] # remember, arrays are 0 indexed.

vs

@mercados[0][0]

vs

# do something different to populate @mercados 1 level deep
#mercados[0]