how to make a mongodb collection find (db.collection.find) with empty values?
currently i have:
function test(s) {
if (!s) {
return null;
} else {
return s;
}
}
var content = {
date: {
from: '2017-10-15',
to: '2017-11-15'
},
'name': 'some text', //this can be null or empty
'text': 'some other text' //this can be null or empty
}
col.find({
"date": {
$gte: new Date(content.date.from),
$lte: new Date(content.date.to)
},
"name": {
$ne: {
$type: null
},
$eq: test(content.name)
},
"text": {
$ne: {
$type: null
},
$eq: test(content.text)
},
}).toArray((err, items) => {
console.log(items)
});
but it returns an empty array, because "name" or "text" is null / an empty string, i want that it query only the values that have something specified or ignore it (like content.name is something in it or its empty)
how do i get it? i already searched ... but didnt found something
thanks!
( already testet mongoDB : multi value field search ignoring null fields )
Versions: Node: 8.9.0 (npm) mongodb: 2.2.33 mongodb: 3.4
Try using $and, $or operators. Something like.
col.find({
$and:[
{"date": {$gte: new Date(content.date.from),$lte: new Date(content.date.to)}},
{"$or":[{"name": {$ne: {$type: null}}},{"name":test(content.name)}]},
{"$or":[{"text": {$ne: {$type: null}}},{"text":test(content.text)}]}
]
}).toArray((err, items) => {
console.log(items)
});
col.find({
$and: [
{
$and: [
{
"date": {
$gte: new Date(content.date.from)
}
},
{
"date": {
$lte: new Date(content.date.to)
}
},
]
},
{
$or: [
{ 'name': null },
{ 'name': content.name }
]
},
{
$or: [
{ 'text': null },
{ 'text': content.text }
]
}
]
})
Edited:
col.find({
$and: [
{
$and: [
{
"date": {
$gte: new Date(content.date.from)
}
},
{
"date": {
$lte: new Date(content.date.to)
}
},
]
},
{
$or: [
{ 'name': null },
{ 'name':'' }
{ 'name': content.name }
]
},
{
$or: [
{ 'text': null },
{ 'text': '' },
{ 'text': content.text }
]
}
]
})
null
and empty
is different, you need to add one more condition for empty string in query.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.