what is #params in Iron:router - meteor

with meteor's IronRouter, I'm trying to use the this.params object elsewhere, but confused as to what it is. It seems to be a zero length array, that is actually an object with named methods after the path components.
# coffee
#route 'magnets',
path: '/magnets/lesson/:lessonCname'
data: ->
if #ready()
debugger;
console.log("route.params", #params)
with this code, in the debug console I will get:
this.params
[]
this.params.lessonCname
"despite-magnets-01"
typeof(this.params)
"object"
this.params.length
0
this.ready()
but in passing the params object to a server method, the methods (ie "lessonCname") disappear.
If my understanding is correct, then the near-term question is what is the best way to retrieve/convert these methods to {property:value} so they can be serialized and passed to server calls?

There are two easy ways of solving your problem, you can either set a global variable from within the data scope (but this is considered bad practice, at least IMO) or you can use the "data" function, which returns the data context for the current template:
data: ->
window._globalscopedata = #params.whatever #setting global variable
return someCollection.findOne #returns data context
_id: #params.whatever
when proccessing this route I will have the whatever param available in _globalscoredata and my document available in the template context.

Take a look at the source code for retrieving the parameters from a path. params is an array, but may have named properties. To iterate over everything, you can use the for in loop:
for(var x in myArray){
// Do something.
}
In this way, you can copy over everything to a new object (there may be a simpler way to create a copy).

The params property attached to a RouteController is an object with the following properties :
hash : the value of the URL hash.
query : an object consisting of key/value pairs representing the query string.
a list of URL fragments with their name and actual value.
Let's take an example, for this route definition :
// using iron:router#1.0.0-pre2 new route definition
Router.route("/posts/:slug");
And this URL typed in the browser address bar : /posts/first-post#comments?lang=en
We can use the console to find out precisely what params will actually contain :
> Router.current().params
Which will display this result :
Object {
hash: "comments",
slug: "first-post",
query: {
lang: "en"
}
}
Here slug is already a property of the params object whose value is "first-post", this is not a method.
If you want to extract from params these URL fragments as an object of key/value pairs, you can use underscore omit :
// getting rid of the hash and the query string
var parameters=_.omit(this.params,["hash","query"]);

Related

Update an object with notation with a parameter?

In my firebase i have a collection, inside there is a document, and inside there is an object :
object 1
key1:value
key2:value
key3:value
I would like to only update certain keys inside an object say
object1 - key1 and key2.
to do that, i need notation.
the problem is that I pass a parameter to the function that save :
function updateit(product,target)
{
db.collection("Stores").doc(target).update({
product
})
So here if I pass a product that contains only key 1, it will override the previous.
So, I tried to pass this object with notation :
product["product"+".title"] = "xxxxx"; // a new pair in product to pass
and it didn't work, it will save a new object (override) with fields like :
product
product.title=xxxxx
How should you do such a simple thing ?
ok obviously, this is the answer :
db.collection("Stores").doc(targetStore).update(
product // no {} around 'product', not as object!
)
see the comment that explains it all.

Retrieve values from firebase database in conversation flow

I am trying to grab information from my firebase database after a particular intent is invoked in my conversation flow.
I am trying to make a function which takes a parameter of user ID, which will then get the highscore for that user, and then say that users highscore back to them.
app.intent('get-highscore', (conv) => {
var thisUsersHighestscore = fetchHighscoreByUserId(conv.user.id);
conv.ask('your highest score is ${thisUsersHighestScore}, say continue to keep playing.');
});
function fetchHighscoreByUserId(userId){
var highscoresRef = database.ref("highscores");
var thisUsersHighscore;
highscoresRef.on('value',function(snap){
var allHighscores= snap.val();
thisUsersHighscore = allHighscores.users.userId.highscore;
});
return thisUsersHighscore;
}
An example of the data in the database:
"highscores" : {
"users" : {
"1539261356999999924819020" : {
"highscore" : 2,
"nickname" : "default"
},
"15393362381293223232222738" : {
"highscore" : 78,
"nickname" : "quiz master"
},
"15393365724084067696560" : {
"highscore" : "32",
"nickname" : "cutie pie"
},
"45343453535534534353" : {
"highscore" : 1,
"nickname" : "friendly man"
}
}
}
It seems like it is never setting any value to thisUsersHighScore in my function.
You have a number of issues going on here - both with how you're using Firebase, how you're using Actions on Google, and how you're using Javascript. Some of these issues are just that you could be doing things better and more efficiently, while others are causing actual problems.
Accessing values in a structure in JavaScript
The first problem is that allHighscores.users.userId.highscore means "In an object named 'allHighscores', get the property named 'users', from the result of that, get the property named 'userId'". But there is no property named "userId" - there are just a bunch of properties named after a number.
You probably wanted something more like allHighscores.users[userId].highscore, which means "In an object named 'allHighscores', get the property named 'users', fromt he result of that, get the property named by the value of 'userId'".
But if this has thousands or hundreds of thousands of records, this will take up a lot of memory. And will take a lot of time to fetch from Firebase. Wouldn't it be better if you just fetched that one record directly from Firebase?
Two Firebase Issues
From above, you should probably just be fetching one record from Firebase, rather than the whole table and then searching for the one record you want. In firebase, this means you get a reference to the path of the data you want, and then request the value.
To specify the path you want, you might do something like
var userRef = database.ref("highscores/users").child(userId);
var userScoreRef = userRef.child( "highscore" );
(You can, of course, put these in one statement. I broke them up like this for clarity.)
Once you have the reference, however, you want to read the data that is at that reference. You have two issues here.
You're using the on() method, which fetches the value once, but then also sets up a callback to be called every time the score updates. You probably don't need the latter, so you can use the once() method to get the value once.
You have a callback function setup to get the value (which is good, since this is an async operation, and this is the traditional way to handle async operations in Javascript), but you're returning a value outside of that callback. So you're always returning an empty value.
These suggest that you need to make fetchHighScoreByUserId() an asynchronous function as well, and the way we have to do this now is to return a Promise. This Promise will then resolve to an actual value when the async function completes. Fortunately, the Firebase library can return a Promise, and we can get its value as part of the .then() clause in the response, so we can simplify things a lot. (I strongly suggest you read up on Promises in Javascript and how to use them.) It might look something like this:
return userScoreRef.once("value")
.then( function(scoreSnapshot){
var score = scoreSnapshot.val();
return score;
} );
Async functions and Actions on Google
In the Intent Handler, you have a similar problem as above. The call to fetchHighScoreByUserId() is async, so it doesn't finish running (or returning a value) by the time you call conv.ask() or return from the function. AoG needs to know to wait for an async call to finish. How can it do that? Promises again!
AoG Intent Handlers must return a Promise if there is an asyc call involved.
Since the modified fetchHighScoreByUserId() returns a Promise, we will leverage that. We'll also set our response in the .then() part of the Promise chain. It might look something like this:
app.intent('get-highscore', (conv) => {
return fetchHighscoreByUserId(conv.user.id)
.then( function(highScore){
conv.ask(`Your highest score is ${highScore}. Do you want to play again?`);
} );
});
Two asides here:
You need to use backticks "`" to define the string if you're trying to use ${highScore} like that.
The phrase "Say continue if you want to play again." is a very poor Voice User Interface. Better is directly asking if they want to play again.

How to traverse object with dynamic keys in Paw?

Let's say we have the following JSON response:
{
"abcd1234": {
"foo": "bar"
}
}
How would "bar" be accessed in a response parsed body value? In the response, "abcd1234" could be anything. But we want the first key in the object (in JavaScript this would be Object.keys(res)[0]).
Paw makes it easy to parse JSON (and XML) responses and access subfields via their key-path.
This documentation article may help: https://paw.cloud/docs/advanced/reuse-values-from-previous-responses
Insert the Response Parsed Body dynamic value
Set the input request and extract the needed value
In your example, the key path will be:
abcd1234.foo
Though, it seems like you need to access the path without knowing the key before hand. If so, one way would be to use a JavaScript snippet to be able to achieve the behavior you want.
On any field, you may right-click and pick Extensions > JS Script.
Here's a snippet that may fit your needs:
function evaluate(context){
var request = context.getCurrentRequest();
var exchange = request.getLastExchange();
var body = JSON.parse(exchange.responseBody);
var key = Object.keys(body)[0];
var value = body[key].foo;
return value;
};

How to parse a collection's sub-object to find a unique result from many possibilities?

In my user's schema, I have a TokAuth Array with token sub-objects (like multiple mails addresses).
So in a method, when I search the tokens in the current user :
var id = Meteor.userId();
var usercurrent = Meteor.users.findOne({_id: id}, {fields: {"TokAuth": 1}});
var userToken = usercurrent.TokAuth.token;
I got in console.log(userToken)
[ 'fyAyXkXYrQdAlNpjuQfJ8RLU2TpfVGLnptlBs-m1h7xk',
I20170224-20:36:23.202(1)? 'YTwtUbhNTgiEfzFbJq7mESnOoOHeLYxWlqEeJJIG_GiV',
I20170224-20:36:23.206(1)? 'ViA4ydDITJtHDi2c_sArkNtpRYTjFqGL1ju2v00_-rFJ',
I20170224-20:36:23.206(1)? '51ImZcxRADLJr-FPCUL7EFGnTZYjHSZk3XxdqtBV2_fd',
I20170224-20:36:23.207(1)? 'S5aEvqjJ5zTUJqLFCPY1aZ1ZhsQppZTJtYKULM9aS2B3',
I20170224-20:36:23.207(1)? 'mhBs3oxHf2SxZfu2vCZhtiyPfg25fKMY8bKMZD8fx6IG',
I20170224-20:36:23.207(1)? '-rv0FiP-lxoqe8INyCJASV6rZpbgy3euEqB9sO9HsZSV',
I20170224-20:36:23.207(1)? 'zacr6_VBjHTsArov1LmQyZFLwI40fx4J7sygpLosTrli' ]
Beside, I've got a var who is equal to the last token in the userToken sub-object (that's of course expected : not to be the last one, but to be in the sub-object).
console.log (editAuth);
zacr6_VBjHTsArov1LmQyZFLwI40fx4J7sygpLosTrli
So how can I parse userToken to find a match with editAuth? If userToken was just a String, it will be simple but here...
Thanks
Is there a reason you are storing all the tokens as an array as opposed to just updating a single string each time?
That aside, you can check if an array contains a value by using the handy underscore function _.contains
Example:
_.contains( userToken, editAuth ); //returns true or false
In this case, you are simply trying to search for a string within an array of strings. #Sean already provided one solution.
If you are using the meteor ecmascript package then you can just simply use the native Array.includes method.
userToken.includes(editAuth);
On a side note, after using ECMAScript 2015+ for some time now, I find that I can use the native API for almost everything that I used to use underscore or lodash for. Check it out!

Getting the reference from $firebaseArray to make a new reference object

Related to this question, I need to be able to get an element from a collection as a Firebase reference, ie given a $firebaseArray I need a $firebaseObject pointing to one of its elements. Unlike that example, I can't just hard-code a path the array and take a child from there because the location of the array will vary. And I can't use $firebaseArray.$getRecord() or the object provided by my ng-repeat followed by array.$save() because I may need to do a push() on this element.
So I settled on this reusable approach:
In a service:
function selectElement(array, element) {
var obj = $firebaseObject(array.$ref().child(element.$id));
return obj;
}
In the controller:
function onItemClicked(e) {
vm.selected = dataservice.selectElement(vm.observations, e);
}
In the template:
<div class="list-item" ng-repeat="o in vm.observations" ng-click="vm.onItemClicked(o)">
The first line of selectElement produces an error: array.$ref(...).child is not a function at Object.selectElement
Here array has all the properties you'd expect, but logging array.$ref() shows this obfuscated object:
Y {k: Ji, path: P, n: Ce, pc: true}
That is what it looks like from the time the array is created. What's going on here and how do I use this reference? Is there another way to get a working Firebase object out of an array?

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