How to use Waterfall process in Nodejs using LUIS - node.js

Question

I have LUIS app created, with 1 intent(Order Pizza) and 9 entities(Order,Kind, Signature, Size, Toppings, address, Time, Duration, Range).
I need to create a bot in Azure Bot Framework. I'm unable to understand and use the waterfall for all the entities. Please let me know how to go about it
Code :
dialog.matches('OrderPizza', [
function (session, args, next) {
var order = builder.EntityRecognizer.findEntity(args.entities, 'order');
var kind = builder.EntityRecognizer.findEntity(args.entities, 'Kind');
session.dialogData.intentScore = args.score;
if (!order) {
builder.Prompts.text(session, 'welcome please order pizza');
} else {
session.dialogData.order = order;
next();
}
},
function (session, results) {
var order = session.dialogData.order;
if (results.response) {
session.send('what kind?');
}else{
session.send(`we don't have that kind of pizza`);
}
}
]);
How to go further for other entities?

Answer 1

I'm not sure what you mean by only being able to write 2 functions; but if you're trying to call LUIS inside of your dialog you can follow this example. You'll call a LuisRecognizer inside your waterfall step on session.message.text. The snippet from the example is below:
builder.LuisRecognizer.recognize(session.message.text, '<model url>', function (err, intents, entities) {
if (entities) {
var entity = builder.EntityRecognizer.findEntity(entities, 'TYPE');
// do something with entity...
}
});
This would allow you to call LUIS inside a waterfall for recognizing your user's messages.
Regarding your code there is a number of issues:
// Original Code
dialog.matches('OrderPizza', [
function (session, args, next) {
var order = builder.EntityRecognizer.findEntity(args.entities, 'order');
var kind = builder.EntityRecognizer.findEntity(args.entities, 'Kind');
session.dialogData.intentScore = args.score;
if (!order) { // What about kind?
builder.Prompts.text(session, 'welcome please order pizza');
} else {
session.dialogData.order = order; // What about kind?
next();
}
},
function (session, results) {
var order = session.dialogData.order;
if (results.response) {
session.send('what kind?');
}else{
session.send(`we don't have that kind of pizza`);
}
}
]);
In your first waterfall step you're not saving the "Kind" entity to your dialogData.
function (session, args, next) {
var order = builder.EntityRecognizer.findEntity(args.entities, 'order');
var kind = builder.EntityRecognizer.findEntity(args.entities, 'Kind');
session.dialogData.intentScore = args.score;
if (kind) {
session.dialogData.kind = kind;
}
if (!order) {
builder.Prompts.text(session, 'welcome please order pizza');
} else {
session.dialogData.order = order;
next();
}
}
In your second waterfall step you are not calling next, nor are you sending a Prompt to the user, which results in you being stuck after two functions.
function (session, results, next) {
var order = session.dialogData.order ? session.dialogData.order : results.response;
var kind = session.dialogData.kind;
if (results.response && !kind) {
builder.Prompts.text(session, 'what kind?');
} else {
session.send('we don\'t have that kind of pizza');
next();
}
}