Strong parameters in rails with array as root object

Question

I have an array of objects being passed to my controller with this structure:

[
    {
        "id": 1,
        "fruit_ids": [1, 2, 3]
    },
    {
        "id": 2,
        "fruit_ids": [4, 5, 6]
    },
]

The root object, is not a {}, and instead is a array. I'm not sure how to write a strong params state for this case. I have tried

params.permit [:id, fruit_ids: []]

and other similar options, but it wasn't permitting it.

Edit:

I'm not sending a JSON object in my request body. I'm sending a JSON array. When I inspect the value of params in my controller, this is the result:

{
    "_json" => [
        {"id"=>1, "fruit_ids"=>[1, 2, 3]},
        {"id"=>2, "fruit_ids"=>[4, 5, 6]}
    ],
    "format"=>"json",
    "controller"=>"...",
    "action"=>"..."
}

Check about wrap_parameters. check this stackoverflow.com/questions/10774972/… — prasannaboga
– prasannaboga, Commented Mar 9, 2018 at 11:03
Possible duplicate of How to permit arrays with hash in Rails 4? — jon1467
– jon1467, Commented Mar 9, 2018 at 11:06

Pere Joan Martorell · Accepted Answer · 2019-11-09 10:05:33Z

5

This is the correct answer:

params.require(:_json).map { |params| params.permit(:id, :fruit_ids) }

answered Nov 9, 2019 at 10:05

Pere Joan Martorell

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1 Comment

sunny1304 Over a year ago

This is an excellent solution. thanks Pere Joan Martorell.

Anurag Aryan · Accepted Answer · 2018-03-09 12:23:45Z

2

Ideally you should always send a JSON objects as a param, when you don't explicitly give a key for object, it takes _json as is the case with your params.

Anyway to write a strong parameter in your case, you can do something like,

params = ActionController::Parameters.new({
    "_json" => [
        {"id"=>1, "fruit_ids"=>[1, 2, 3]},
        {"id"=>2, "fruit_ids"=>[4, 5, 6]}
    ],
    "format"=>"json",
    "controller"=>"...",
    "action"=>"..."
}

params.permit('_json': [:id, fruit_ids: []]) # You need this line.

# => {"_json"=>[{"id"=>1, "fruit_ids"=>[1, 2, 3]}, {"id"=>2, "fruit_ids"=>[4, 5, 6]}]}

answered Mar 9, 2018 at 12:23

Anurag Aryan

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