Rails - Apr 2014 - Validation of model object through a relationship

I'm a beginner in Rails working through the Hartl tutorial while trying to 
work on my own project(s) at the same time.

One Project I'm trying to work on is a basic 'assembly' application
because
it's what I do now full time.

Right now it's a pretty basic app with 3 Models

Ingredient
Bulk
RecipeItem

There is a has_many through relationship between Ingredient and Bulk 
through RecipeItem

In the recipe_items table there is an additional attribute i'm calling 
quantity - it must be greater than 0 and less than 1.

The validation question I have is this.

Is there an easy way to set up a validation on a Bulk object that requires 
its related RecipeItem objects to add up to one...after all the recipeitem 
objects are added?

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