（mongoDB）查找具有空值或空值的

Question

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

Answer 1

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)
});

Answer 2

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.

Logical Query Operators