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?
Share Improve this question edited Oct 24, 2016 at 13:39 JohnnyHK 312k69 gold badges630 silver badges475 bronze badges asked Oct 24, 2016 at 12:48 SergioSergio 6191 gold badge7 silver badges11 bronze badges 1-
getCollection('docs').find
insteadgetCollection('docs')find
– BrTkCa Commented Oct 24, 2016 at 12:52
3 Answers
Reset to default 5You 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);