So I got a function that executes every X minutes/hours, when it executes it will select a random database array value, when it does, the selected will get + 1. Selected stands for the amount of times the row has been selected.
id: 5 name: tom selected: 17 id: 8 name: tim selected: 12 id: 2 name: tombie selected: 5 id: 3 name: timbie selected: 4
This is my code from which I catch all of my database values
function setValue (value) {
console.log("Array", value);
result_arr = Object.values(JSON.parse(JSON.stringify(value)));
return result_arr;
}
console.log("arr", result_arr);
db.connect(function(err) {
db.query("SELECT * FROM developers", (err, result, fields) => {
if (err) {
console.log(err);
} else {
// selected = all.map(item => item.selected);
console.log("result", result);
setValue(result);
console.log("value", setValue(result));
removeMax()
}
})
Lets say if we have Selected: 5, 4, 12 and 17. 17 is the highest selected count, to avoid it gaining more selected points, I ensure the highest numbers is removed from the array. Once the highest number is removed, I shuffle the numbers and it will select a random one.
function removeMax() {
const max = Math.max(result_arr.map(item => item.selected));
const newArr = result_arr.map(item => item.selected).filter(number => number !== max);
var shufflearray = newArr[Math.floor(Math.random()*newArr.length)];
return shufflearray;
}
Lets say from the shuffle I get 5. I now have to add + 1 to this, so 5 must become 6.
In function hi() I have an If statement, everyday at 8 am this code has to be executed. So as I said, I have to update the selected value.
Here comes the question: Usually I would do UPDATE developers SET selected = 6 WHERE id = 2. but since I have multiple rows this wont work. Today It might be Timbie, tommorow It can be Tim. How do I link the selected values with their IDs?
function hi() {
window.setInterval(function(){
var date = new Date();
if (date.getHours() === 8 && date.getMinutes() === 0) {
if (test) {
db.query( `UPDATE developers SET selected = ? WHERE id = ${item.id} `,[selected, id],
(err, result) => {
if (err) {
console.log(err);
} else {
res.send(result);
}
});
}
}
else {
const abort = "abort"
}
}, 60000);
}
Advertisement
Answer
In the function removeMax(), the data is reduced to become just a list of the selected values. You would need to keep each item, not only the number of times it is selected.
Original code:
function removeMax() {
const max = Math.max(result_arr.map(item => item.selected));
const newArr = result_arr.map(item => item.selected).filter(number => number !== max);
var shufflearray = newArr[Math.floor(Math.random()*newArr.length)];
return shufflearray;
}
Original result:
var result_arr = [{'id': 1, 'selected': 10}, {'id': 2, 'selected': 5}, {'id': 3, 'selected': 15}, {'id': 4, 'selected': 7}]
newArr = result_arr.map(item => item.selected)
resulting newArr: [10, 5, 15, 7]
After that, you are removing the largest value. Notice how all the id’s are gone?
If you instead do:
newArr = result_arr.filter(item => item.selected !== max)
resulting newArr: [{id: 1, selected: 10}, {id: 2, selected: 5}, {id: 4, selected: 7}]
Now that you have an array of objects, you can rearrange them as before, and afterwards access the # of selected with item.selected, and each id with item.id.