[Rails] [RAILS] How to design that Model?

Hi!

I have a problem designing the following model. Better I have problems to write the corresponding rails code to get that model up and running as expected.

I tried several combinations of different tables, has_and_belongs_to statements with several options with join_tables and I tried self joins, etc... Really, I dont see a solution...

OK, here the problem:

I have the model "Item" and every "Item" should be craftable. Therefore it needs "Ingredients", this "Ingridients" are "Items" too.

Given Item "Flour"

And Item "Water"

When I mix it

Then I should have the Item "Dough"

But it is not that easy (the above example is complicated enough for me).

Since the Items have all a unit of messurement (Water is litre, Flour is kilograms) I only want to have fractions in the receipe list.

Something like that:

1kg Flour + 0.25 litre Water = 1.25 kg Dough

I really dont know how to do the migration and model for that "Recipe"

Of course there are Items that dont have ingredients (How could I assemble something into water?) or are not needed as Ingredient anymore (What should I build with a skyscraper?)

Could you help me?

TIA

Norbert Melzer

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