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Four ways to set parameter values in Dialogflow

This article talks about setting parameter values. (Were you interested in how to pass parameters between intents?)

I got this question on my YouTube channel recently:

what is the correct way to modify parameters using v2 from webhook? When I change them inside “outputContexts” it works. But, what about an intent which is not using context?

This reminded me of something else I have wanted to write about. Did you know there are 4 ways to set parameter values in Dialogflow? Knowing these can sometimes get you around some Dialogflow constraints.

1 Entity extraction during intent mapping

When Dialogflow maps the user’s phrase to an existing intent, it will extract the appropriate entity values in the user phrase where it can. So this is one way that a parameter value is set in Dialogflow – via entity extraction.

2 Setting the value in the parameters table

In my Intro to Dialogflow course, I show you how to create a Quiz bot. After the quiz is complete, the quiz bot should be able to tell you your score on the quiz.

This means, when the “correct” answer intent fires, we should assign a score of 1 to the user’s training phrase. As you see, this isn’t a value which you can extract from the user’s answer, which means we need to explicitly set it. This can be done by simply setting the value of a param such as answer1 to either a 0 or 1 indicating wrong or correct answer.

3 Setting the value inside an Event which triggers an intent

If you read my article on using an API call to Dialogflow to pass parameters to your conversation session, you can see that you can associate parameters with your event.

4 Setting parameters from your webhook

This brings us to the original question.

You can set parameter values from the webhook. But, you can only do it if it is set as part of an active context.

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  • I need to get user put from previous intent for example
    first intent- What is your firstName?
    2nd intent is- i got your firstName. what is your lastName.
    3rd intent – your Full name is firstName lastName.
    here I don’t know how to get firstName value

  • Hello, I’ve a followup intent which include a context that has a parameter ‘counter’ – with initial value set to zero. This follow-up intent makes a webhook call which receives the context along with the parameter “counter”: “0”. I’d like to know how to modify this parameter ‘counter’ value to say 5 from webhook (using python code) – any help will be much appreciated.

      • In puzzle-bot, user when says gimme a puzzle, a puzzle will be presented along with an instruction something like ‘do you need hint’. The user can keep asking for hint and more and more hints will be provided. I imagined two intents for this – ‘Provide_a_puzzle’ and it’s follow-up ‘Provide_a_puzzle – need_a_hint’. Further, each time a user asks for a hint, the follow-up intent will send a quizz_id and a hint_index to webhook which will send the hint for the next hint_index and set the new value of hint_index back to the bot. If user asks for another hint, the webhook now knows which hint to use by extracting the previously set value from the request, and increment the value again. Pls, let me know your thoughts.

      • I’m creating a bot for puzzle. User will be presented with a puzzle and then if they need hint, bot will provide one at a time. I decided to model this with two intents – ‘Supply_puzzle’ and a follow-up intent ‘Supply_puzzle – get_a_hint’. When user asks for puzzle, Supply_puzzle will contact webhook and a puzzle will be provided. Subsequent request for hint will be taken care of by the follow-up intent by calling a webhook. Since multiple users may play with same puzzle at the same time, it’s important that we keep track of the hint-index for each session. Further, if I added a param say, hint_index then each time webhook receives a req from follow-up intent we get the last hint_index. Then the webhook can supply the next hint as well as can modify the param value so that for next call from this intent give us the currect hint_index. Hope this provides the idea, why I need a way to update a param value from webhook

        • That’s fine, I don’t have any answer for your question then. You can ask on other forums like StackOverflow.