Attributes API allows you to have complex object with specified structure in fields. But how to make forms with this fields?

The answer is pretty simple: you work with them like with nested attributes.

Let’s say, we have class Provider with attribute address. 


class Provider < ApplicationRecord

  attribute :address, Provider::Address::Type.new, default: Provider::Address.new

Address has following attributes:


class Provider::Address

  extend Dry::Initializer



  option :country, optional: true

  option :zip, optional: true

  option :city, optional: true

  option :address, optional: true

Form will look like this:


= form_for resource_provider, provider_url do |f|

  = f.fields_for :address do |ff|

      = ff.label 'Country'

      = ff.text_field :country, value: @provider.billing_address.country



      = ff.label 'Zip'

      = ff.text_field :zip, value: @provider.billing_address.zip



      = ff.label 'City'

      = ff.text_field :city, value: @provider.billing_address.city



      = ff.label 'Address'

      = ff.text_field :address, value: @provider.billing_address.address

In controller you have to permit parameters:


def provider_params

    params.require(:provider).permit(address: [:city, :zip, :country, :address])

end

And that’s all. Now, in action method you can assign attributes like this:


resource_provider.attributes = provider_params

resource_provider.save
#rails #ror #ruby #ruby-on-rails
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