Nodejs-dialogflow: Parameters don't show when Intent resolves

[pariola]

i'm trying to create a context with some parameters passed into it so it can be used when the intent is resolved.

The issue is the context is created but the parameters don't show up.

I have this function for creating the context.

const struct = require('./struct');

const createContext = (context, senderId, lifespan, parameters) => {
  const sessionPath = contextClient.sessionPath(
    process.env.DIALOGFLOW_PROJECT_ID,
    senderId
  );

  const contextPath = contextClient.contextPath(
    process.env.DIALOGFLOW_PROJECT_ID,
    senderId,
    context
  );

  const contextRequest = {
    parent: sessionPath,
    context: {
      name: contextPath,
      lifespanCount: lifespan
    }
  };

  if (parameters) contextRequest.context.parameters = struct(parameters);

  return contextClient.createContext(contextRequest);
};

struct.js

const jsonToStructProto = function jsonToStructProto(json) {
  const fields = {};
  for (const k in json) {
    fields[k] = jsonValueToProto(json[k]);
  }

  return { fields };
};

const jsonValueToProto = function jsonValueToProto(value) {
  const valueProto = {};
  const JSON_SIMPLE_TYPE_TO_PROTO_KIND_MAP = {
    [typeof 0]: "numberValue",
    [typeof ""]: "stringValue",
    [typeof false]: "boolValue"
  };

  if (value === null) {
    valueProto.kind = "nullValue";
    valueProto.nullValue = "NULL_VALUE";
  } else if (value instanceof Array) {
    valueProto.kind = "listValue";
    valueProto.listValue = { values: value.map(jsonValueToProto) };
  } else if (typeof value === "object") {
    valueProto.kind = "structValue";
    valueProto.structValue = jsonToStructProto(value);
  } else if (typeof value in JSON_SIMPLE_TYPE_TO_PROTO_KIND_MAP) {
    const kind = JSON_SIMPLE_TYPE_TO_PROTO_KIND_MAP[typeof value];
    valueProto.kind = kind;
    valueProto[kind] = value;
  } else {
    console.warn("Unsupported value type ", typeof value);
  }
  return valueProto;
};

const structProtoToJson = function structProtoToJson(proto) {
  if (!proto || !proto.fields) {
    return {};
  }
  const json = {};
  for (const k in proto.fields) {
    json[k] = valueProtoToJson(proto.fields[k]);
  }
  return json;
};

const valueProtoToJson = function valueProtoToJson(proto) {
  const JSON_SIMPLE_VALUE_KINDS = new Set([
    "numberValue",
    "stringValue",
    "boolValue"
  ]);

  if (!proto || !proto.kind) {
    return null;
  }

  if (JSON_SIMPLE_VALUE_KINDS.has(proto.kind)) {
    return proto[proto.kind];
  } else if (proto.kind === "nullValue") {
    return null;
  } else if (proto.kind === "listValue") {
    if (!proto.listValue || !proto.listValue.values) {
      console.warn("Invalid JSON list value proto: ", JSON.stringify(proto));
    }
    return proto.listValue.values.map(valueProtoToJson);
  } else if (proto.kind === "structValue") {
    return structProtoToJson(proto.structValue);
  } else {
    console.warn("Unsupported JSON value proto kind: ", proto.kind);
    return null;
  }
};

module.exports = jsonToStructProto;

any help would be very much appreciated!

[pcdroidski]

Having the exact same issue! Parameters are either removed or Dialogflow will replace them with defaults. This happens across the entire array of contexts.

[M-Abozaid]

Any updates on this??

[vishald123]

You need to create an event in your dialogflow agent ex.'init'. Pass this as parameter to sendQuery() method below . Can use the following format for requestBody while calling DetectIntent() method. Try with the following code

const dialogflow = require('dialogflow');
const struct = require('./struct');
async function createContext(sessionId, contextId, parameters) {
    const sessionPath = contextsClient.sessionPath(projectId, sessionId);
    const contextPath = contextsClient.contextPath(
        projectId,
        sessionId,
        contextId
    );
    const request = {
        parent : sessionPath,
        context : {
            name : contextPath,
            parameters : struct(parameters),
            lifespanCount : 5
        }
    }
    const context = await contextsClient.createContext(request);
    return context;
}
function sendQuery(sessionId, query, context) {
    const session = sessionsClient.sessionPath(projectId, sessionId);
    const request = {
        session,
        queryInput : {
            event : {
                name : query,
                languageCode: 'en-US'
            }
        },
        queryParameters : {
            contexts : context,
            'resetContexts' : true
        }
    };
    return sessionsClient.detectIntent(request);
}

(async() => {
    const parameters = { name: 'John' };

    const sessionId = 'my-session';
    const context = await createContext(sessionId,[YOUR-CONTEXT], parameters);
    const response = await sendQuery(sessionId, [QUERY], context);
    console.log(response[0].queryResult.parameters);
})();

Let me know if this solution works for you.

[callmehiphop]

Haven't seen much activity here lately, I'm going to assume that @vishald123's solution did the trick. If that's not the case please let us know and we'll be happy to continue investigating 😎