Permitting JSON Array Parameters in Rails

Question

Having a bit of trouble, im trying to permit array parameters and i've seen example of that...however I haven't seen an example where the array is an array of objects and the top level array is one of the main params being pulled in.

Sample JSON:

{
  "message_json": {
    "device": {
      "deviceid": "002"
    },
     "measurements": 
        [
            {
          "temp": 71.45,
          "humidity": 31.5
            },
            {
            "temp": 75.34,
            "humidity": 35.9
            }
        ]
  }
}

Functions for permitting:

   def device_params
      params[:message_json].fetch(:device, {}).permit(:deviceid)
   end

   def measurement_params
      params[:message_json].fetch(:measurements, {}).permit(:temp,:humidity)
   end

So the measurement_params does not work, and I know normally you'd do something like array_obj: [] but this arrays object is already the measurements param thats getting fetched? How would I go about permitting these items?

Буянбат Чойжилсүрэн · Accepted Answer · 2018-03-12 16:13:41Z

2

Did you try something like this:

def measurement_params
   params.require(:message_json).permit(measurements: [:temp, :humidity])
end

I am unable test this right now. But I was dealt with this problem and solved with this way.

answered Mar 12, 2018 at 16:13

Буянбат Чойжилсүрэн

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2 Comments

msmith1114 Over a year ago

That worked, looks like I was also able to combine them too params.require(:message_json).permit(measurements: [:temp, :humidity], device: [:deviceid]) . Although im not sure how that would work with using fetch however if I wanted to use it.

Буянбат Чойжилсүрэн Over a year ago

Glad if helped. This one is called as nested params. Fetch will work fine. But I am not on environmet right now.

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