javascript - MongoDB search string in array of objects - Stack Overflow

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I have a structure in MongoDB that have different amounts of items in an array called "items". To make the search, I am using the following mand, which first turns the contents into a string, as in this.items there is a different structure depending on the object:

db.getCollection('docs').find.('JSON.stringify(this.items[0].value).toLowerCase().indexOf("text")!=-1')

My problem is that as I do not know the amount of items that each document has, I would have to use a wildcard as this.items[*].value, but it does not work.

Does anyone know any solution, or have another idea for this?

I have a structure in MongoDB that have different amounts of items in an array called "items". To make the search, I am using the following mand, which first turns the contents into a string, as in this.items there is a different structure depending on the object:

db.getCollection('docs').find.('JSON.stringify(this.items[0].value).toLowerCase().indexOf("text")!=-1')

My problem is that as I do not know the amount of items that each document has, I would have to use a wildcard as this.items[*].value, but it does not work.

Does anyone know any solution, or have another idea for this?

• javascript
• php
• mongodb

Share Improve this question Follow edited Oct 24, 2016 at 13:39 JohnnyHK 312k6969 gold badges630630 silver badges475475 bronze badges asked Oct 24, 2016 at 12:48 SergioSergio 61911 gold badge77 silver badges1111 bronze badges 1

• getCollection('docs').find instead getCollection('docs')find – BrTkCa Commented Oct 24, 2016 at 12:52

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3 Answers 3

Sorted by: Reset to default 5

You can use the $elemMatch (https://docs.mongodb./manual/reference/operator/projection/elemMatch/)

db.docs.find({items: {$elemMatch: {value: {$regex : "text"}}}});

So this query will find all documents with an item in the items array that contain the string "text" in the value property, after this operation you can count how much items the document has.

You can use dot notation of items.value to target the value field of all items elements, and a regular expression to perform the case-insensitive sub-string match:

db.getCollection('docs').find({ 'items.value': /text/i })

You can iterate each document and apply the indexOf, something like this..

var cursor = db.getCollection('docs').find({}); // get all docs
var newOut = []; // new array of items if match with some condition
while ( cursor.hasNext() ){ // iterate all docs

   var doc = cursor.next(); // get the document in focus
   doc.items.forEach(function(item){ // iterate the items of doc.items
       if ( item.toLowerCase().indexOf("text") !== -1 ) // check if text exists in array
           newOut.push(item); // add to new array
   });

};
printjson(newOut);

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