Send response to Dialogflow webhook - ruby-on-rails

Question

I'm trying to implement Dialogflow bot. I've set all intents, the response defined for the intent and webhook receiver controller. It works well but based on Fulfillment docs after Dialogflow request to my webhook service I need to send response to Dialogflow. How to do that?
Here is my webhook service:
class Api::V1::WebhooksController < ActionController::API
include ActionController::HttpAuthentication::Basic::ControllerMethods
include ActionController::HttpAuthentication::Token::ControllerMethods
http_basic_authenticate_with name: Rails.application.credentials.webhook_auth_name, password: Rails.application.credentials.webhook_auth_password
def create
action_name = params[:webhook][:queryResult][:intent][:displayName]
case action_name
when 'get-calendar'
render json: 'Show calendar', status: :ok
when 'get-room'
render json: 'Show available rooms', status: :ok
end
end
end
Which gives me that message inside Raw interaction log :
{
"queryText": "Calendar",
"parameters": {},
"fulfillmentText": "<happy>This is your calendar</happy>",
"fulfillmentMessages": [
{
"text": {
"text": [
"<happy>This is your calendar</happy>"
]
},
"lang": "en"
}
],
"intent": {
"id": "1234",
"displayName": "get-calendar",
"priority": 500000,
"webhookState": "WEBHOOK_STATE_ENABLED",
"messages": [
{
"text": {
"text": [
"<happy>This is your calendar</happy>"
]
},
"lang": "en"
}
]
},
"intentDetectionConfidence": 1234,
"diagnosticInfo": {
"webhook_latency_ms": 1234
},
"languageCode": "en",
"slotfillingMetadata": {
"allRequiredParamsPresent": true
},
"id": "1234",
"sessionId": "1234",
"timestamp": "2020-09-25T14:38:31.92Z",
"source": "agent",
"webhookStatus": {
"webhookEnabledForAgent": true,
"webhookStatus": {
"code": 3,
"message": "Webhook call failed. Error: Failed to parse webhook JSON response: Expect message object but got: \"Show\"."
}
},
"agentEnvironmentId": {
"agentId": "1324",
"cloudProjectId": "test-project"
}
}
I don't think this part is what I expected:
"message": "Webhook call failed. Error: Failed to parse webhook JSON response: Expect message object but got: \"Show\"."

Answer 1

DialogFlow calls your WebHook when processing an Intent, you need to ensure your code send back a JSON object which DialogFlow understands and can process. It looks like you are sending back just a text message (Show Calendar), or at least a JSON starting with `Show..'
You are using DialogFlow API v1 (this is deprecated, better move to V2) so your JSON should look like this. Normally there are SDK (Java, NodeJS, I guess Ruby too?) which provides the model and objects to work with, so you don't need to create the JSON manually but just use the API.