Array in JSON not properly passed to Database

Question

I am trying to create a new entry in my database which contains an array images.

Using Product.new("title":"Hello World", "images":["a.jpg","b.jpg"]) I can create a new entry without problems. But when I try passing the parameters to my API, the array remains empty (all the other fields are filled).

The request I used:

curl -i -H "Accept: application/json" -H "Content-type: application/json" -X POST -d '{"title":"Hello World",  "images":["a.jpg", "b.jpg"], "api_key":"API_KEY"}' http://localhost:3000/api/products

Parameters are passed using:

def product_params
  params.require(:product).permit(:id, :title, :images)
end

A new database entry is then created using:

Product.new(product_params)

Any help is highly appreciated.

Community · Accepted Answer · 2017-05-23 11:52:29Z

2

Use images: [].

via: https://stackoverflow.com/a/18641790/1076207

From the documentation [https://github.com/rails/strong_parameters]

The permitted scalar types are String, Symbol, NilClass, Numeric, TrueClass, FalseClass, Date, Time, DateTime, StringIO, IO, ActionDispatch::Http::UploadedFile and Rack::Test::UploadedFile.

To declare that the value in params must be an array of permitted scalar values map the key to an empty array:

def product_params
  params.require(:product).permit(:title, images: [])
end

edited May 23, 2017 at 11:52

CommunityBot

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answered Jun 30, 2016 at 21:11

SoAwesomeMan

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