Ruby on Rails

I have three tables: the products, type_products, properties and
value.

**Typeproduct.rb**

has_many :products
has_many :properties

**Property.rb**

belongs_to :type_product
has_many :values

**Value.rb**

belongs_to :property

**Product.rb**

belongs_to :type_product

What a best way to generate a form based on the conditions and values,
when client changing the type_products in the form

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