Ruby - bad output from arrays

Question

I have a form with a lots of these text inputs:

<%= text_field_tag 'name[seq]['+dat.id.to_s+']', dat.seq%>

After send this form I want to save them to database, I try to get the values from inputs in each loop:

unless params[:name].nil?
  params[:name][:seq].each_with_index do |sq, i|
    puts sq
  end
end

But the output in terminal is wrong, for example if I have an input with the values

<%= text_field_tag 'name[seq][25]', 3%>

So I am going to expect the output is 3, but I will get to terminal this:

25
3

Is here something important, what I don't see?

mu is too short · Accepted Answer · 2011-10-18 22:45:28Z

1

Yes, you are missing something. Within your each_with_index block, sq will be an array and that's why you get that output.

So, what's going on here? Well, your params will contain this:

"name" => { "seq" => { "25" => "3" } }

And that means that params[:name][:seq] is this:

{ "25" => "3" }

Then you apply each_with_index to that to iterate through the Hash. If you do it like this:

params[:name][:seq].each_with_index do |(k,v), i|
  puts "-#{k}-#{v}-"
end

you'll see what's going on.

If you just want the 3 then you can iterate over params[:name][:seq] as above and just look at v inside the block or, if you know what the '25' is some other way, you could just go straight there:

three = params[:name][:seq]['25']

answered Oct 18, 2011 at 22:45

mu is too short

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2 Comments

user984621 Over a year ago

Thanks, so that mean... the index i is here totally useless, right?

mu is too short Over a year ago

@user984621: Pretty much useless, just an each would probably do you just as well.

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