loopback4 Regular Expressions- Match Anything - regex

Question

I use loopback4. How do I make an expression to match datetime with time zone.I am interested by the hour parameter only: "finalhour"
example: 2019-12-20T10:22:50.143Z ==> 2019-12-20Tfinalhour:22:50.143Z
I tried with this: const pattern=await '^'+"T"+finalhour+'^'
but loopback usually read it as ^T10^
I'm resort to you after a long search in the forums.I will be thankful if you help me

Answer 1

From what i understand, you want to build a regex that match 2019-12-20TsomeNumber:22:50.143Z.
You could use this default ISO datetime regex
(\d{4})-(\d{2})-(\d{2})T(\d{2})\:(\d{2})\:(\d{2})\.\d{3,4}Z
And modify it to take your finalhour variable in it.
let finalHour = 10;
// when building regex from constructor, we need to espace the backslash ( \ )
// i did not know that.
let regex = new RegExp('(\\d{4})-(\\d{2})-(\\d{2})T' + finalHour + '\\:(\\d{2})\\:(\\d{2})\\.\\d{3,4}\\Z');
let test = '2019-12-20T10:22:50.143Z';
console.log(regex.test(test));
Also, you don't need an await keyword here because your are building a string, not waiting for a promise.

Answer 2

I need to return the number of order per hour. so i try this solution but it return false comparison, for example if i have one order at hour:10 it return 6
#get('/orders/count-perHour/{date}', {
responses: {
'200': {
description: 'Order model count',
content: { 'application/json': { schema: CountSchema } },
},
},
})
async countPerHour(
#param.path.string('date') date: string): Promise<any> {
let dateStart = new Date(date);
dateStart.setSeconds(0);
dateStart.setMinutes(0);
let dateEnd = new Date(date);
dateEnd.setSeconds(59);
dateEnd.setMinutes(59);
return await this.orderRepository.count(
{
createdAt: {
lte: dateEnd
,
gte: dateStart
}
}
);
}