Is it possible to show a form with fields for the jsonb properties

Question

I have a Product model with a jsonb field called dynamic.

I have actually 2 product records

Product 1 :

dynamic = {"name": "super product 1", "description": "lorem ipsum text" }

Product 2 :

dynamic = {"title": "this is an ebook", "author": "john doe", "creation_date": "2015"}

To edit each product I need to show a form. for the product 1 the form will contains 2 fields (name and description), and for product 2 the form will contains 3 fields (title, author,creation_date)

I have searched but it seem that all the articles I have found talk about how to use the console to save or edit a json field but no one talks about how to use the form.

any help please ? Thanks

Answer 1

If you are using simple_form you can do something like this:

f.simple_fields_for :dynamic do |dynamic_f|
  @product.dynamic.each do |k,v|
    dynamic_f.input k.to_sym
  end
end

Don't forget to allow the parameters in the controller like this:

params.require(:product).permit(dynamic: [:name, :description, :title, :author, :creation_date]])

It is always good practice to whitelist the specific params that you need but if you want to allow everything inside dynamic you can try something like this:

params.require(:product)permit( **permitted paramters in here** ).tap do |whitelisted|
  whitelisted[:dynamic] = params[:product][:dynamic] if params[:product][:dynamic]
end

Or to allow everything for the product model use:

params.require(:product).permit!

This is not recommended though as it would leave your other data outside of the json field open to be overwritten.