Mongoose how to write a query with if condition? - node.js

Question

Suppose I have the following query:
post.getSpecificDateRangeJobs = function(queryData, callback) {
var matchCriteria = queryData.matchCriteria;
var currentDate = new Date();
var match = { expireDate: { $gte: new Date(currentDate.getFullYear(), currentDate.getMonth(), currentDate.getDate()) } };
if (queryData.matchCriteria !== "") {
match = {
expireDate: { $gte: new Date(currentDate.getFullYear(), currentDate.getMonth(), currentDate.getDate()) },
$text: { $search: matchCriteria }
};
}
var pipeline = [
{
$match: match
},
{
$group: {
_id: null,
thirtyHourAgo: {
$sum: {
$cond: [
{
$gte: [
"$publishDate",
new Date(queryData.dateGroups.thirtyHourAgo)
]
},
1,
0
]
}
},
fourtyEightHourAgo: {
$sum: {
$cond: [
{
$gte: [
"$publishDate",
new Date(queryData.dateGroups.fourtyHourAgo)
]
},
1,
0
]
}
},
thirtyDaysAgo: {
$sum: {
$cond: [
{
$lte: [
"$publishDate",
new Date(queryData.dateGroups.oneMonthAgo)
]
},
1,
0
]
}
}
}
}
];
var postsCollection = post.getDataSource().connector.collection(
post.modelName
);
postsCollection.aggregate(pipeline, function(err, groupByRecords) {
if (err) {
return callback("err");
}
return callback(null, groupByRecords);
});
};
What i want to do is:
1- check if queryData.dateGroups.thirtyHourAgo existed and has value, then only add the relevant match clause in query (count of posts only for past 30 hour).
2- check if queryData.dateGroups.fourtyHourAgo existed, then add relevant query section (count of posts for past 30 hour, and past 48 hour ago).
3 and the same for queryData.dateGroups.oneMonthAgo (count of posts for past 30 hour, 48 hour, and past one month).
I need something like Mysql if condition to check if a variable existed and not empty then include a query clause. Is it possible to do that?
My sample data is like:
/* 1 */
{
"_id" : ObjectId("58d8bcf01caf4ebddb842855"),
"vacancyNumber" : "123213",
"position" : "dsfdasf",
"number" : 3,
"isPublished" : true,
"publishDate" : ISODate("2017-03-11T00:00:00.000Z"),
"expireDate" : ISODate("2017-05-10T00:00:00.000Z"),
"keywords" : [
"dasfdsaf",
"afdas",
"fdasf",
"dafd"
],
"deleted" : false
}
/* 2 */
{
"_id" : ObjectId("58e87ed516b51f33ded59eb3"),
"vacancyNumber" : "213123",
"position" : "Software Developer",
"number" : 4,
"isPublished" : true,
"publishDate" : ISODate("2017-04-14T00:00:00.000Z"),
"expireDate" : ISODate("2017-05-09T00:00:00.000Z"),
"keywords" : [
"adfsadf",
"dasfdsaf"
],
"deleted" : false
}
/* 3 */
{
"_id" : ObjectId("58eb5b01c21fbad780bc74b6"),
"vacancyNumber" : "2432432",
"position" : "Web Designer",
"number" : 4,
"isPublished" : true,
"publishDate" : ISODate("2017-04-09T00:00:00.000Z"),
"expireDate" : ISODate("2017-05-12T00:00:00.000Z"),
"keywords" : [
"adsaf",
"das",
"fdafdas",
"fdas"
],
"deleted" : false
}
/* 4 */
{
"_id" : ObjectId("590f04fbf97a5803636ec66b"),
"vacancyNumber" : "4354",
"position" : "Software Developer",
"number" : 5,
"isPublished" : true,
"publishDate" : ISODate("2017-05-19T00:00:00.000Z"),
"expireDate" : ISODate("2017-05-27T00:00:00.000Z"),
"keywords" : [
"PHP",
"MySql"
],
"deleted" : false
}
Suppose I have three link in my application interface:
1- 30 hour ago posts.
2- 48 hour ago posts.
3- last one month posts.
Now if user click on first link i should control to group posts only for 30 hour ago, but if user click on second link, i should prepare my query to group posts for 30 hour and also for 48 hour, and if user click on third link i should prepare for all of them.
I want something like:
var pipeline = [
{
$match: match
},
{
$group: {
_id: null,
if (myVariable) {
thirtyHourAgo: {
........
........
}
}
if (mysecondVariable) {
fortyEightHourAgo: {
........
........
}
}

Answer 1

You can use javascript to dynamically create json document based on your query parameters.
Your updated function will look something like
post.getSpecificDateRangeJobs = function(queryData, callback) {
var matchCriteria = queryData.matchCriteria;
var currentDate = new Date();
// match document
var match = {
"expireDate": {
"$gte": currentDate
}
};
if (matchCriteria !== "") {
match["$text"]: {
"$search": matchCriteria
}
};
// group document
var group = {
_id: null
};
// Logic to calculate hours difference between current date and publish date is less than 30 hours.
if (queryData.dateGroups.thirtyHourAgo) {
group["thirtyHourAgo"] = {
"$sum": {
"$cond": [{
"$lte": [{
"$divide": [{
"$subtract": [currentDate, "$publishDate"]
}, 1000 * 60 * 60]
}, 30]
},
1,
0
]
}
};
}
// Similarly add more grouping condition based on query params.
var postsCollection = post.getDataSource().connector.collection(
post.modelName
);
// Use aggregate builder to create aggregation pipeline.
postsCollection.aggregate()
.match(match)
.group(group)
.exec(function(err, groupByRecords) {
if (err) {
return callback("err");
}
return callback(null, groupByRecords);
});
};

Answer 2

As I understood, I can suggest you following general query. Modify this according to your need.
db.getCollection('vacancy')
.aggregate([{$match: { $and: [
{publishDate:{ $gte: new Date(2017, 4, 13) }} ,
{publishDate:{ $lte: new Date(2017, 4, 14) }}
]} }])
Summary:
Used match to filter out result.
We are using aggregation Pipeline so you can add more aggregate operators n the pipeline
Using $and perform a logical AND because we want to fetch some documents between a give range say 1 day, 2 days or 1 month (change date parameters according to your requirement)