Including ingredients, meal types, cuisines, dietary restrictions, short recipes, easy recipes.

Prolog and Patterns

We need to refine our logic now for retrieving only those recipes that satisfy specific filters. We already introduced a recipeFiltered/3 predicate for Request a Recommendation but there it did not have to do any serious work yet. We only introduced the base case without any filters (an empty list of filters) but now need to deal with the case where we have some filters that a user provided. The basic idea to define a recursive clause for recipeFiltered/3 is simple: apply the first filter in the list to the recipes and recursively filter the remaining recipes using the remaining filters. We provide you below with the recursive clause that you should add below the base clause that we added earlier in the recipe_selection.pl file:

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For the featureRemovalRequest intent, you should add a simple text/2 fact. Use as response text, for example, "Can you have a look again and remove one of your recipe requirements?".

Visuals

We want to differentiate what we show to a user depending on the number of recipes that still meet the user’s requests. The basic idea is that we should not show a large number of recipes to a user but we can show recipe details when the number of remaining recipes becomes sufficiently small (we chose <16, see also above). As a consequence, we want to create two different versions of the a50recipeSelect page that we created for Request a Recommendation : one that just shows the feature requests made when there are more than 15 recipes that meet these requests, and another for when there are less that 16 which shows the recipe details (titles and pictures) for all of the remaining recipes.

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Extend Recipe Overview 1 page

Start by extending the code for the recipe recommendation page that we already created. The first thing we want to do is add a condition for when to show this page. This page should be shown when there is still a long list of recipes that match the requests made thus far by a user. We would like to show this page when the number of filtered recipes is still above 15. Use the recipesFiltered/1, check the length of the list of recipes this predicate returns, and add a condition that makes sure it consists of more than 15 recipes.

You should also add more information to this first a50recipeSelect page. The main requirement is that the page shows all the user’s feature requests or filters. You can collect these from the agent’s memory and use the predicate filters_to_strings/1 for this that has already been defined in the dialogflow.pl file. For styling the layout of the page, use rules defined in the html.pl file or add new ones (see also the [TBU]Visual Support Guide).

Add a second recipe recommendation page

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