support resource that is not a list

[TSMMark]

Sometimes a resource is just a hash with properties, and not a list. This PR supports this.

Example:

attribute(:branding_input, type: :hash, input_field: "InputObjects::SmartPageBrandingInput", required: true, skip: true)

def validate
  with_resource(:branding_input) do
    validate_format(:primary_color, /\A#(?:[0-9a-fA-F]{3}){1,2}\z/)
    validate_format(:background_overlay, /\Argba\((\s*(1?[0-9]{1,2}|2[0-4][0-9]|25[0-5])\s*,){3}\s*(0|0?\.\d+|1)\s*\)\z/)
  end
end

[MVV90]

Cools