In Mongo how can I find all documents that have a given key and value, regardless of where that key appears in the document's key/value hierarchy?
For example the input key roID and value 5 would match both:
{
roID: '5'
}
and
{
other: {
roID: '5'
}
}
There is no built in way to do this. You might have to scan each matched document recursively to try and locate that attribute. Not recommended. You might want to think about restructuring your data or perhaps manipulating it into a more unified format so that it will be easier (and faster) to query.
If your desired key appears in a fixed number of different locations, you could use the $or operator to scan all the possibilities.
Taking your sample documents as an example, your query would look something like this:
db.data.find( { "$or": [
{ "roID": 5 },
{ "other.roID": 5 },
{ "foo.bar.roID": 5 },
{ any other possbile locations of roID },
...
] } )
If the number of documents in collection is not so large, then it can be done by this:
db.system.js.save({_id:"keyValueExisted", value: function (key, value) {
function findme(obj) {
for (var x in obj) {
var v = obj[x];
if (x == key && v == value) {
return true;
} else if (v instanceof Object) {
if (findme(v)) return true;
}
}
return false;
}
return findme(this);
}});
var param = ['roID', '5'];
db.c.find({$where: "keyValueExisted.apply(this, " + tojsononeline(param) + ");"});
Related
I have a database like this:
[
{
"universe":"comics",
"saga":[
{
"name":"x-men",
"characters":[
{
"character":"wolverine",
"picture":"618035022351.png"
},
{
"character":"cyclops",
"picture":"618035022352.png"
}
]
}
]
},
{
"universe":"dc",
"saga":[
{
"name":"spiderman",
"characters":[
{
"character":"venom",
"picture":"618035022353.png"
}
]
}
]
}
]
and with this code I manage to update one of the objects in my array. specifically the object where character: wolverine
db.mydb.findOneAndUpdate({
"universe": "comics",
"saga.name": "x-men",
"saga.characters.character": "wolverine"
}, {
$set: {
"saga.$[].characters.$[].character": "lobezno",
"saga.$[].characters.$[].picture": "618035022354.png",
}
}, {
new: false
}
)
it returns all my document, I need ONLY the document matched
I would like to return the object that I have updated without having to make more queries to the database.
Note
I have been told that my code does not work well as it should, apparently my query to update this bad, I would like to know how to fix it and get the object that matches these search criteria.
In other words how can I get this output:
{
"character":"wolverine",
"picture":"618035022351.png"
}
in a single query using filters
{
"universe": "comics",
"saga.name": "x-men",
"saga.characters.character": "wolverine"
}
My MongoDB knowledge prevents me from correcting this.
Use the shell method findAndModify to suit your needs.
But you cannot use the positional character $ more than once while projecting in MongoDb, so you may have to keep track of it yourself at client-side.
Use arrayFilters to update deeply nested sub-document, instead of positional all operator $[].
Below is a working query -
var query = {
universe: 'comics'
};
var update = {
$set: {
'saga.$[outer].characters.$[inner].character': 'lobezno',
'saga.$[outer].characters.$[inner].picture': '618035022354.png',
}
};
var fields = {
'saga.characters': 1
};
var updateFilter = {
arrayFilters: [
{
'outer.name': 'x-men'
},
{
'inner.character': 'wolverine'
}
]
};
db.collection.findAndModify({
query,
update,
fields,
arrayFilters: updateFilter.arrayFilters
new: true
});
If I understand your question correctly, your updating is working as expected and your issue is that it returns the whole document and you don't want to query the database to just to return these two fields.
Why don't you just extract the fields from the document returned from your update? You are not going to the database when doing that.
var extractElementFromResult = null;
if(result != null) {
extractElementFromResult = result.saga
.filter(item => item.name == "x-men")[0]
.characters
.filter(item => item.character == "wolverine")[0];
}
I imported some sort-of sloppy XML data into a Mongo database. Each Document has nested sub-documents to a depth of around 5-10. I would like to find() documents that have a particular value of a particular field, where the field may appear at any depth in the sub-documents (and may appear multiple times).
I am currently pulling each Document into Python and then searching that dictionary, but it would be nice if I could state a filter prototype where the database would only return documents that have a particular value of the field name somewhere in their contents.
Here is an example document:
{
"foo": 1,
"bar": 2,
"find-this": "Yes!",
"stuff": {
"baz": 3,
"gobble": [
"wibble",
"wobble",
{
"all-fall-down": 4,
"find-this": "please find me"
}
],
"plugh": {
"plove": {
"find-this": "Here too!"
}
}
}
}
So, I'd like to find documents that have a "find-this" field, and (if possible) to be able to find documents that have a particular value of a "find-this" field.
You are right in the certain statement of a BSON document is not an XML document. Since XML is loaded into a tree structure that comprises of "nodes", searching on an arbitary key is quite easy.
A MonoDB document is not so simple to process, and this is a "database" in many respects, so it is generally expected to have a certain "uniformity" of data locations in order to make it easy to both "index" and search.
Nonetheless, it can be done. But of course this does mean a recursive process executing on the server and this means JavaScript processing with $where.
As a basic shell example, but the general function is just a string argument to the $where operator everywhere else:
db.collection.find(
function () {
var findKey = "find-this",
findVal = "please find me";
function inspectObj(doc) {
return Object.keys(doc).some(function(key) {
if ( typeof(doc[key]) == "object" ) {
return inspectObj(doc[key]);
} else {
return ( key == findKey && doc[key] == findVal );
}
});
}
return inspectObj(this);
}
)
So basically, test the keys present in the object to see if they match the desired "field name" and content. If one of those keys happens to be an "object" then recurse into the function and inspect again.
JavaScript .some() makes sure that the "first" match found will return from the search function giving a true result and returning the object where that "key/value" was present at some depth.
Note that $where essentially means traversing your whole collection unless there is some other valid query filter than can be applied to an "index" on the collection.
So use with care, or not at all and just work with re-structring the data into a more workable form.
But this will give you your match.
Here is one example, which I use for recursive search for Key-Value anywhere in document structure:
db.getCollection('myCollection').find({
"$where" : function(){
var searchKey = 'find-this';
var searchValue = 'please find me';
return searchInObj(obj);
function searchInObj(obj){
for(var k in obj){
if(typeof obj[k] == 'object' && obj[k] !== null){
if(searchInObj(obj[k])){
return true;
}
} else {
if(k == searchKey && obj[k] == searchValue){
return true;
}
}
}
return false;
}
}
})
I imported some sort-of sloppy XML data into a Mongo database. Each Document has nested sub-documents to a depth of around 5-10. I would like to find() documents that have a particular value of a particular field, where the field may appear at any depth in the sub-documents (and may appear multiple times).
I am currently pulling each Document into Python and then searching that dictionary, but it would be nice if I could state a filter prototype where the database would only return documents that have a particular value of the field name somewhere in their contents.
Here is an example document:
{
"foo": 1,
"bar": 2,
"find-this": "Yes!",
"stuff": {
"baz": 3,
"gobble": [
"wibble",
"wobble",
{
"all-fall-down": 4,
"find-this": "please find me"
}
],
"plugh": {
"plove": {
"find-this": "Here too!"
}
}
}
}
So, I'd like to find documents that have a "find-this" field, and (if possible) to be able to find documents that have a particular value of a "find-this" field.
You are right in the certain statement of a BSON document is not an XML document. Since XML is loaded into a tree structure that comprises of "nodes", searching on an arbitary key is quite easy.
A MonoDB document is not so simple to process, and this is a "database" in many respects, so it is generally expected to have a certain "uniformity" of data locations in order to make it easy to both "index" and search.
Nonetheless, it can be done. But of course this does mean a recursive process executing on the server and this means JavaScript processing with $where.
As a basic shell example, but the general function is just a string argument to the $where operator everywhere else:
db.collection.find(
function () {
var findKey = "find-this",
findVal = "please find me";
function inspectObj(doc) {
return Object.keys(doc).some(function(key) {
if ( typeof(doc[key]) == "object" ) {
return inspectObj(doc[key]);
} else {
return ( key == findKey && doc[key] == findVal );
}
});
}
return inspectObj(this);
}
)
So basically, test the keys present in the object to see if they match the desired "field name" and content. If one of those keys happens to be an "object" then recurse into the function and inspect again.
JavaScript .some() makes sure that the "first" match found will return from the search function giving a true result and returning the object where that "key/value" was present at some depth.
Note that $where essentially means traversing your whole collection unless there is some other valid query filter than can be applied to an "index" on the collection.
So use with care, or not at all and just work with re-structring the data into a more workable form.
But this will give you your match.
Here is one example, which I use for recursive search for Key-Value anywhere in document structure:
db.getCollection('myCollection').find({
"$where" : function(){
var searchKey = 'find-this';
var searchValue = 'please find me';
return searchInObj(obj);
function searchInObj(obj){
for(var k in obj){
if(typeof obj[k] == 'object' && obj[k] !== null){
if(searchInObj(obj[k])){
return true;
}
} else {
if(k == searchKey && obj[k] == searchValue){
return true;
}
}
}
return false;
}
}
})
I imported some sort-of sloppy XML data into a Mongo database. Each Document has nested sub-documents to a depth of around 5-10. I would like to find() documents that have a particular value of a particular field, where the field may appear at any depth in the sub-documents (and may appear multiple times).
I am currently pulling each Document into Python and then searching that dictionary, but it would be nice if I could state a filter prototype where the database would only return documents that have a particular value of the field name somewhere in their contents.
Here is an example document:
{
"foo": 1,
"bar": 2,
"find-this": "Yes!",
"stuff": {
"baz": 3,
"gobble": [
"wibble",
"wobble",
{
"all-fall-down": 4,
"find-this": "please find me"
}
],
"plugh": {
"plove": {
"find-this": "Here too!"
}
}
}
}
So, I'd like to find documents that have a "find-this" field, and (if possible) to be able to find documents that have a particular value of a "find-this" field.
You are right in the certain statement of a BSON document is not an XML document. Since XML is loaded into a tree structure that comprises of "nodes", searching on an arbitary key is quite easy.
A MonoDB document is not so simple to process, and this is a "database" in many respects, so it is generally expected to have a certain "uniformity" of data locations in order to make it easy to both "index" and search.
Nonetheless, it can be done. But of course this does mean a recursive process executing on the server and this means JavaScript processing with $where.
As a basic shell example, but the general function is just a string argument to the $where operator everywhere else:
db.collection.find(
function () {
var findKey = "find-this",
findVal = "please find me";
function inspectObj(doc) {
return Object.keys(doc).some(function(key) {
if ( typeof(doc[key]) == "object" ) {
return inspectObj(doc[key]);
} else {
return ( key == findKey && doc[key] == findVal );
}
});
}
return inspectObj(this);
}
)
So basically, test the keys present in the object to see if they match the desired "field name" and content. If one of those keys happens to be an "object" then recurse into the function and inspect again.
JavaScript .some() makes sure that the "first" match found will return from the search function giving a true result and returning the object where that "key/value" was present at some depth.
Note that $where essentially means traversing your whole collection unless there is some other valid query filter than can be applied to an "index" on the collection.
So use with care, or not at all and just work with re-structring the data into a more workable form.
But this will give you your match.
Here is one example, which I use for recursive search for Key-Value anywhere in document structure:
db.getCollection('myCollection').find({
"$where" : function(){
var searchKey = 'find-this';
var searchValue = 'please find me';
return searchInObj(obj);
function searchInObj(obj){
for(var k in obj){
if(typeof obj[k] == 'object' && obj[k] !== null){
if(searchInObj(obj[k])){
return true;
}
} else {
if(k == searchKey && obj[k] == searchValue){
return true;
}
}
}
return false;
}
}
})
I imported some sort-of sloppy XML data into a Mongo database. Each Document has nested sub-documents to a depth of around 5-10. I would like to find() documents that have a particular value of a particular field, where the field may appear at any depth in the sub-documents (and may appear multiple times).
I am currently pulling each Document into Python and then searching that dictionary, but it would be nice if I could state a filter prototype where the database would only return documents that have a particular value of the field name somewhere in their contents.
Here is an example document:
{
"foo": 1,
"bar": 2,
"find-this": "Yes!",
"stuff": {
"baz": 3,
"gobble": [
"wibble",
"wobble",
{
"all-fall-down": 4,
"find-this": "please find me"
}
],
"plugh": {
"plove": {
"find-this": "Here too!"
}
}
}
}
So, I'd like to find documents that have a "find-this" field, and (if possible) to be able to find documents that have a particular value of a "find-this" field.
You are right in the certain statement of a BSON document is not an XML document. Since XML is loaded into a tree structure that comprises of "nodes", searching on an arbitary key is quite easy.
A MonoDB document is not so simple to process, and this is a "database" in many respects, so it is generally expected to have a certain "uniformity" of data locations in order to make it easy to both "index" and search.
Nonetheless, it can be done. But of course this does mean a recursive process executing on the server and this means JavaScript processing with $where.
As a basic shell example, but the general function is just a string argument to the $where operator everywhere else:
db.collection.find(
function () {
var findKey = "find-this",
findVal = "please find me";
function inspectObj(doc) {
return Object.keys(doc).some(function(key) {
if ( typeof(doc[key]) == "object" ) {
return inspectObj(doc[key]);
} else {
return ( key == findKey && doc[key] == findVal );
}
});
}
return inspectObj(this);
}
)
So basically, test the keys present in the object to see if they match the desired "field name" and content. If one of those keys happens to be an "object" then recurse into the function and inspect again.
JavaScript .some() makes sure that the "first" match found will return from the search function giving a true result and returning the object where that "key/value" was present at some depth.
Note that $where essentially means traversing your whole collection unless there is some other valid query filter than can be applied to an "index" on the collection.
So use with care, or not at all and just work with re-structring the data into a more workable form.
But this will give you your match.
Here is one example, which I use for recursive search for Key-Value anywhere in document structure:
db.getCollection('myCollection').find({
"$where" : function(){
var searchKey = 'find-this';
var searchValue = 'please find me';
return searchInObj(obj);
function searchInObj(obj){
for(var k in obj){
if(typeof obj[k] == 'object' && obj[k] !== null){
if(searchInObj(obj[k])){
return true;
}
} else {
if(k == searchKey && obj[k] == searchValue){
return true;
}
}
}
return false;
}
}
})