rails jbuilder - just an array of strings

Question

i have a controller that returns an array of ActiveRecord objects and a jbuilder view to generate the json (all standard stuff). works great if i want for example an array of hashes.

so for example i have:

json.array!(@list) do |l|
    json.( l, :field )
end

which returns

[
  { "field": "one" },
  { "field": "two" },
  { "field": "three" }
]

however, i want just an array of strings; such that my json is

[
  "one",
  "two",
  "three"
]

whats should my jbuilder file be?

irmco · Accepted Answer · 2013-05-21 20:27:38Z

60

A bit late but this will work:

json.array! @list

But consider to use it in a block to create a JSON pair:

json.data do
  json.array! @list  
end

# => { "data" : [ "item1", "item2", "item3" ] }

answered May 21, 2013 at 20:27

irmco

92410 silver badges14 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

yee379 Over a year ago

thanks for the reply: i get a 'nil is not a symbol' error when trying either suggestion. however, when i do json.array! @devices do |d| json.i d.device end, it works (however, i have an array of anon hashes with single key 'i' then)

irmco Over a year ago

Just try to create an Array of strings like @devices.collect { |d| d.device } and use this array to create the json.

Max Over a year ago

You can also use pluck like @devices.pluck :device

j will Over a year ago

What if you want to grab things out of an object to put into an array?

Ilya Novojilov · Accepted Answer · 2015-12-21 08:27:45Z

6

If you want Array as a value for some key, this will work:

json.some_key [1, 3, 4]

answered Dec 21, 2015 at 8:27

Ilya Novojilov

8898 silver badges12 bronze badges

Collectives™ on Stack Overflow

rails jbuilder - just an array of strings

2 Answers 2

4 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

4 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related