noosfero | Fixes relations namespaces in Orders and Suppliers plugin (!1110)

[Gabriel Silva]

New comment for Merge Request !1110 on plugins/orders/models/orders_plugin/item.rb:

https://gitlab.com/noosfero/noosfero/merge_requests/1110#note_23993863

>      has_one :to_product, through: :product
>      has_many :sources_supplier_products, through: :product
>      has_one :sources_supplier_product, through: :product
> -    has_many :supplier_products, through: :product
> +    has_many :supplier_products, through: :product, :class_name => "ProductsPlugin::Product"

I'm pretty sure that the `class_name` supports subclasses. There are several examples in Noosfero models, like the following snippet from [scrap.rb]:(https://gitlab.com/noosfero/noosfero/blob/master/app/models/scrap.rb#L13):

```ruby
class Scrap < ApplicationRecord
  ...
  belongs_to :receiver, :class_name => 'Profile', :foreign_key => 'receiver_id'
  belongs_to :sender, :class_name => 'Person', :foreign_key => 'sender_id'
  ...
end
```

In this case, the `receiver` can also be any kind of profile, and the class_name still works.


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