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    <p>If you are trying to do domain-driven design don't start with tables. Elaborate first a conceptual model that reflects your underlying domain. I agree with ndp: RecipeIngredient is a bit of an awkward name/concept, from a DDD perspective.</p> <p>I think the model needs the following concepts: Recipe, Ingredient, Measure and RecipePreparation. </p> <p>A Recipe is an aggregation of Ingredients. Each Ingredient belonging to a Recipe need a Measure associated to it, as a specification for the preparation. Also you need to model the RecipePreparation to associate the actual quantity of each ingredient used during a specific preparation of the recipe. </p> <p>A Measure consists of unit and amount (e.g. 2 cups, 0.5 oz, 250 gr, 2 tbsp...).</p> <p>I see here two different things that could be mixed during analysis and should be kept split: Recipe/Ingredient/Measure as a specification in order to cook something (one instance for each recipe) and RecipePreparation/Ingredient/Measure as a concrete preparation of one recipe, done by a specific person on a specific moment, and may be using different measures (doubled all the ingredients because the recipe specification is for two plates and you have four guests... something like that).</p> <p>You can go deeper and start modeling things like some ingredients having a set of exchangeable ingredients (e.g. if you don't have goat's cheese use mozzarella), a cookbook that collect a set of recipes of the same category, a cooking time for the recipe, etc.</p>
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    1. COI agree that having a RecipeIngredient is awkward in the Domain Model and basically ends up as a 1:1 mapping of the database.
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