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Nested Models not working in form, want an array of nested models

 
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https://github.com/mkidd/cookbook

I'm slightly confused with how models are set up within Ruby/RoR so that one model has control of sub models. that are nested within it. I think I have the models set up so that they reference each other correctly but not only does my view not allow me create the nested models but even but when the form is submitted it attempts to find ingredients.recipe_id (appears correct) but it always never finds it.

This may have to do with the form. But I'm not sure why it's complaining since an empty array should be okay.

To think my coworker had me thinking it would be easy to build this app after he showed me scaffolding
 
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