It's the first time I use reduce with promise, and it's look perfect for my usage.
However, I'm trying to use reduce to iterate more than the original size of my array (call reduce_array in my example).
In fact, in this example, methodThatReturnsAPromise worth true in certain case, false in other. (in the end it always finish by worth false)
The idea is if results is false then reduce work normaly, and go to the next value (nextId). In the other hand, if results is true,
I have to resolve methodThatReturnsAPromise with the same value again.
I already try differents methods using the index in parameter, or I already try to push again the id in reduce_array but none of that work.
reduce_array.reduce((accumulatorPromise, nextId, index, array) => {
return accumulatorPromise.then((results) => {
//if results === end || result === unknownDomain
//next
//first iteration, results don't exist
if (results) {
if (results === true) {
index++;
return methodThatReturnsAPromise(nextId - 1);
} else {
return methodThatReturnsAPromise(nextId);
}
} else {
return methodThatReturnsAPromise(nextId);
}
})
}, Promise.resolve());
A do/while loop inside a for loop will probably be a lot simpler:
(async () => {
for (const nextId of reduce_array) {
let result;
do {
result = await methodThatReturnsAPromise(nextId);
} while (result !== true);
}
})();
If you had to use reduce, you could put a named function which calls itself recursively inside the reduce callback:
reduce_array.reduce((accumulatorPromise, nextId) => {
return accumulatorPromise.then(() => {
const getThisInfo = () => methodThatReturnsAPromise(nextId)
.then((result) => (
result === true
? getThisInfo()
: null
));
return getThisInfo();
})
}, Promise.resolve());
Which is a bit ugly and not so easy to read. I'd prefer the for loop.
Related
having a bit of trouble:
let data = fs.readFileSync(pathToCsv, "utf8");
the value of data comes out to be:
clan,mem1,mem2,mem3,mem4,language,managerID,serverJoinedDate
pm,
pm
(through console.log())
but still data.toString().includes("pm") is false.
Here is my full code:
const filter = (m) => m.author.bot === false;
await ogMessage.author.dmChannel
.awaitMessages(filter, {
max: 1,
time: 60000,
})
.then((collected) => {
if (clans[parseInt(collected.toJSON()[0].content) - 1]) {
let clan = clans[parseInt(collected.toJSON()[0].content) - 1];
let data = fs.readFileSync(pathToCsv, "utf8");
console.log(typeof clan);
// let reg = new RegExp(clan, "g");
// let count = (data.match(reg) || []).length;
if (data.split(",").includes(clan)) {
ogMessage.author.send(
"People from this clan are already registered!\nPlease contact the hosts for help!"
);
return;
} else {
teamCheck = true;
}
} else {
ogMessage.author.send("Invalid Clan! Please try again!");
return;
}
})
.catch((collected) => {
try {
console.log("Error" + collected);
} catch (e) {
console.log(e);
}
});
if (teamCheck === false) {
return;
}
I have tried splitting the data, using regular expressions but nothing seems to work on the string returned by
readFileSync()
PS. I am making a discord bot.
In the source string you have pm with a space before it. That's why after calling split("," you end up with the element " pm" in the result array and "pm" is not equal to it.
You just need to trim spaces in all elements before searching some string in it
The problem was in the clans array.
I was defining it as such:
var clans = fs.readFileSync(pathToData, "utf8").split("\n");
but the problem was that the readFileSync() method added an "\r" after every string of the array. That is why it was not able to match the clan string to the data
So what worked was var clans = fs.readFileSync(pathToData, "utf8").split("\r\n");
Now, the array includes only the string, and the includes() method can find a match!
I need to test that when I select some model car, as a result, I have only that model in all pages. So basically I do pagination testing. But I do something wrong that it does not moves to another page although selectors are correct. Please tell me what I am doing wrong.
findItem("AUDI")
});
async function findItem(value) {
async function findInPage(index) {
let found = false;
cy.get("li.page-item:not(.page-pre):not(.page-next)").as("pages");
await cy.get("#pages")
.its("length")
.then(async (len) => {
if (index >= len) {
return false;
} else {
await cy.get("#pages")
.eq(index)
.click();
await cy.get("table tr > td:nth-child(5) p")
.each(async ($itemNameEl, index) => {
const itemText = $itemNameEl.text().toUpperCase();
cy.log('item ', itemText);
if (itemText.includes(value)) {
found = true;
await cy.wrap($itemNameEl).eq(index);
//cy.get('.chakra-text.css-0').should('include', value)
cy.get('.css-1b4k5p > .chakra-text.css-0')
.each(($el) => {
expect($el.text().toUpperCase()).to.include(value)
})
return false;
}
})
.then(() => {
if (!found) {
findInPage(++index);
}
});
}
});
}
findInPage(0);
}
A simple example without aliases, async functions, etc, just using recursion and a single NEXT PAGE button (that I see you have in your screen shot) would look like this (tested and working on bootstrap pagination examples):
it('Some test', () => {
cy.visit('/')
const findInPage = () => {
cy.get('li:has(a.page-link:has(span:contains(»)))').then((el) => {
// do your test
if (el.hasClass('disabled')) {
// on last page, break out
return
}
cy.wrap(el).click()
findInPage()
})
}
findInPage()
});
How this works: Look for li element which represents a single pagination next-page button, in bootstrap case it has child a tag which has child span tag which contains an icon ». Once you reach last page, the button get's disabled by adding .disabled class to li tag which is checked for on every page. Using this it doesn't matter if you have 3 or 33 pages and if some numbers are hidden with ...
Reference: https://glebbahmutov.com/blog/cypress-recurse/
I am trying to get a text from an element with Cypress in the first test from the first domain and then type it in the second test in another domain, here is a code
I have to grab code from h4.
I implemented next part of code:
get studentCouponValue() {
return cy.get('h4').then(($span) => {
const couponValue = $span.text();
cy.log(couponValue);
})
}
in logs, I see the correct coupon's value, but when I am trying to type it into the field I get an error
The chain approach doesn't fit my expectation, cause i am going to use it in different tests.
Try this:
get studentCouponValue() {
return cy.get('h4').then(($span) => {
const couponValue = $span.innerText;
cy.log(couponValue);
})
}
i resolved
initStudentCouponValue() {
const self = this;
return cy.get('main > .container-fluid').find('h4').then((span) => {
self.couponValue = span.text();
cy.log('First log '+ self.couponValue);
return new Cypress.Promise((resolve) => {
return resolve(self.couponValue);
});
});
}
getStudentCouponValue() {
return this.couponValue;
}
in the test where we want to use value
let couponValue;
admin.initStudentCouponValue().then(() => {
couponValue = admin.getStudentCouponValue()
});
and later we can use
coupoValue
for inputs
I am trying to find a way to iterate all objects from a large collection of data in Firebase Database.
My best attempt follows but I found it odd for several reasons:
startAt() values are always inclusive. So after fetching 100 elements, I had to use my last fetched key as an argument to startAt which results in the last item being fetched again
DataSnapshot's forEach method doesn't allow a callback with an index count as you would think it would based on JS's standards so I had to create a manual index - not sure it will work in every case as i'm not sure if forEach works perfectly synchronously
Here is my code, given the assumption my collection is located at users.
const mapAllTripsPaginated = function (database, childSnapshotCallback, start = '', limit = 100, totalNb = 0) {
return database.ref('/users').orderByKey().startAt(start).limitToFirst(limit).once('value').then((snapshot) => {
let childrenPromises = []
let lastChildKey = null
let idx = 0
snapshot.forEach((childSnapshot) => {
lastChildKey = childSnapshot.key
if (start !== '' && idx === 0) {
// console.log(`Skipping ${childSnapshot.key} as 1st element of page`)
} else {
childrenPromises.push(childSnapshotCallback(childSnapshot))
}
idx = idx + 1
})
return Promise.all(childrenPromises)
.then((result) => {
let newTotal = totalNb + result.length
if (snapshot.numChildren() === limit) {
console.log(`Paginating from ${lastChildKey}`)
return mapAllTripsPaginated(database, childSnapshotCallback, start = lastChildKey, limit = limit, totalNb = newTotal)
} else {
// Done paginating
return newTotal
}
})
})
}
Any idea on how I could make this method more elegant?
Firebase queries are inclusive both for their start and end conditions. You will indeed have to deduplicate the overlapping item on the client.
Firebase's Snapshot.forEach() is a synchronous operation.
I'd normally deduplicate based on already having the key of the item. That will also remove the need for the idx counter.
snapshot.forEach((childSnapshot) => {
if (lastChildKey !== childSnapshot.key) {
childrenPromises.push(childSnapshotCallback(childSnapshot))
}
lastChildKey = childSnapshot.key
})
I'm trying to implement an afterFind hook on a model and can't quite figure out what the semantics are. I'll pulled the following together from trial and error using the doc and other StackOverflow questions as guidelines.
My goal is to massage the result (by applying get(plain : true)) and pass the transformed value as the result of the promise. For instance, I'd expect/want this to return an empty result set:
hooks: {
afterFind: function(result, options, fn)
{
result = [];
}
},
but it just causes the request to hang. Documentation says the arguments are pass by reference and doesn't include a return. Other samples imply something like:
hooks: {
afterFind: function(result, options, fn)
{
result = [];
return fn(null, result);
}
},
which doesn't hang, but doesn't change my result set. Not to mention, I've no idea what the magical "fn" argument is/does.
I had a similar problem. This is because when you do a findAll the argument passed to the hook is an array of values instead of a single object. I did this as a workaround -
hooks: {
afterFind: function(result) {
if(result.constructor === Array) {
var arrayLength = result.length;
for (var i = 0; i < arrayLength; i++) {
result[i].logo = "works";
}
} else {
result.logo = "works";
}
return result;
}
}
In the above code I change the logo attribute of the record(s) after finding it.