CODEWITHSUNDEEP
ruby-on-railsrubyarraysruby-on-rails-3
Abid Hussain
Abid Hussain

Reputation: 7762

How do I print an array in Rails?

I am new to Rails and I am using Ruby version 1.9.3 and Rails version 3.0.0.

I want to print an array in Rails. How do I do that?

For example, we have to use print_r to print an array in PHP:

<?php

$a = array ('a' => 'apple', 'b' => 'banana', 'c' => array ('x', 'y', 'z'));
print_r ($a);

?>

Output:

<pre>
Array
(
    [a] => apple
    [b] => banana
    [c] => Array
        (
            [0] => x
            [1] => y
            [2] => z
        )
)
</pre>

How do I print an array in Rails?

Upvotes: 0

Views: 3438

Answers (4)

Debadatt
Debadatt

Reputation: 6015

You can use inspect like:

@a = ['a', 'b']
p @a #['a', 'b']

Or:

p @a.inspect #"[\"a\", \"b\"]"

Upvotes: 11

bundacia
bundacia

Reputation: 1036

You've got a couple of options here. I'm assuming you're doing this in an ERB template.

This will convert the array to YAML and print it out surrounded in <pre> tags

<%= debug [1,2,3,4] %>

And this will print it out formatted in a readable Ruby syntax:

<pre><%= [1,2,3,4].inspect %></pre>

Check out "Debugging Rails Applications" for more info.

Upvotes: 0

Richard Peck
Richard Peck

Reputation: 76774

It depends on what you want to use the array for.

To blindly output an array in a view, which has to be in a view, you should use debug and inspect like this:

<%= @array.inspect() %>

<%= debug @array %>

However, if you want to iterate through an array, or do things like explode(), you'll be better suited using the Ruby array functions.

Upvotes: 0

Arup Rakshit
Arup Rakshit

Reputation: 118299

You need to use awesome_print gem.

require 'awesome_print'

hash = {:a=>1,:b=>2,:c => [1,2,3]}

ap hash

output:

{
    :a => 1,
    :b => 2,
    :c => [
        [0] 1,
        [1] 2,
        [2] 3
    ]
}

Upvotes: 2

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