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export class ApiFeatures {
constructor(mongooseQuery, queryString) {
this.mongooseQuery = mongooseQuery;
this.queryString = queryString;
}
//1-Pagination
pagination() {
const PAGE_LIMIT = 3;
let PAGE_NUMBER = this.queryString.page * 1 || 1;
if (this.queryString.page <= 0) PAGE_NUMBER = 1;
const PAGE_SKIP = (PAGE_NUMBER - 1) * PAGE_LIMIT; //2*3
this.mongooseQuery.skip(PAGE_SKIP).limit(PAGE_LIMIT);
return this;
}
//2-Filteration
filteration() {
let filterObj = { ...this.queryString };
// console.log(filterObj);
let excludedQuery = ["page", "sort", "fields", "keyword"];
excludedQuery.forEach((ele) => {
delete filterObj[ele];
});
filterObj = JSON.stringify(filterObj);
// console.log(filterObj);
filterObj = filterObj.replace(
/\b(gt|gte|lt|lte)\b/g,
(match) => `$${match}`
);
filterObj = JSON.parse(filterObj);
this.mongooseQuery.find(filterObj);
return this;
}
//3-Sort
sort() {
if (this.queryString.sort) {
// console.log(req.query.sort);
let sortedBy = this.queryString.sort.split(",").join(" ");
// console.log(sortedBy);
this.mongooseQuery.sort(sortedBy);
}
return this;
}
//4-Search
search() {
if (this.queryString.keyword) {
// console.log(this.queryString.keyword);
this.mongooseQuery.find({
$or: [
{ title: { $regex: this.queryString.keyword, $options: "i" } },
{ descripton: { $regex: this.queryString.keyword, $options: "i" } },
],
});
}
return this;
}
//4-Fields
fields() {
if (this.queryString.fields) {
// console.log(this.queryString.fields);
let fields = this.queryString.fields.split(",").join(" ");
console.log(fields);
// this.mongooseQuery.select(fields);
}
return this;
}
}
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