Rails - Mar 2012 - Auto generating forms

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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That''s four tables and they look cumbersome already and I
haven''t even
seen the data yet.  Before I give you an answer, drop two example rows 
from each table and include the fields.  I have a feeling that you are 
not properly normalizing this and over-complicating things for yourself.

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