I have this data structure
{
"job-requests" : {
"pending" : {
"-KkyZGfqmiIVryyLAZpD" : {
"job_details" : "asd",
"job_type" : "Repair Required",
"location" : "123",
"location_lat" : 14.164633210106128,
"location_lng" : 121.24110514763743,
"timestamp" : 1495698316411
}
}
},
"office-info" : {
"123" : {
"office_acronym" : "123",
"office_contact_number" : "123-1234",
"office_current_head" : "None",
"office_name" : "123",
"office_parent_unit" : "123"
}
},
"office-location-list" : {
"123" : {
"location_lat" : 14.164633210106128,
"location_lng" : 121.24110514763743
}
},
"users" : {
"MBR5o37xafUyuLw14Xqa1ku0Zui1" : {
"designation" : "staff",
"email" : "123#asd.com",
"given_name" : "23",
"last_name" : "123",
"password" : "1234567",
"timestamp" : 1495617328793
},
"Nwacy3ADczgLC85OvSAgUNEGMkx2" : {
"designation" : "staff",
"email" : "adsasd#asdas.com",
"given_name" : "122123",
"last_name" : "12",
"password" : "asdasdsadasd",
"timestamp" : 1495681430048
}
}
}
I will be needing the keys [pending, active, finished] along with the data of the newly added child. This is how I accessed Firebase
firebase.database ().ref ('job-requests').on ('child_added', (snapshot) => {
console.log (snapshot.key); // prints out [pending, active, finished]
console.log (snapshot.val()); // prints out an object
});
It prints this on the console:
I tried using JSON.parse (), snapshot.child (path), snapshot.field, and snapshot[field] but errors are thrown out. How do I do this?
Your code gets all job requests. Since those are in a hierarchy by their state, your code will need to handle this:
firebase.database ().ref ('job-requests').on ('child_added', (snapshot) => {
snapshot.forEach((stateSnapshot) => {
console.log(stateSnapshot.key); // 'pending', etc
stateSnapshot.forEach((jobSnapshot) => {
console.log(jobSnapshot.key);
console.log(jobSnapshot.val());
});
});
});
Related
I am using mongoDB as backend server, I have nested array(one level array) like this
{
"_id" : ObjectId("60b1fc6d3c43f74e0c1dba92"),
"seriesId" : "60acebf73acb5b3a98d14331",
"name" : "Season 1",
"logoURL" : "uploads/season/1622277216401.png",
"yearOfPublish" : "2021-05-29",
"description" : "Season 1",
"createdBy" : ObjectId("609cbf49ba46cc3924859ab5"),
"createdOn" : "2021-05-29T08:33:49.480Z",
"episode" : [
{
"seasonId" : "60b1fc6d3c43f74e0c1dba92",
"name" : "Episode 1",
"id" : 0,
"logoURL" : "uploads/episode/1622278616899.png",
"dateOfTelecast" : null,
"description" : "sadfgh",
"duration" : "30",
"videoType" : "customURL",
"embedCode" : "",
"url" : "https://youtu.be/kbpsXMUr7ss",
"liveboxChannel" : "",
"createdOn" : "2021-05-29T08:56:59.230Z",
"createdBy" : ObjectId("609cbf49ba46cc3924859ab5"),
"_id" : "ZaVrpOLO5"
},
{
"seasonId" : "60b1fc6d3c43f74e0c1dba92",
"name" : "Episode 2",
"id" : 0,
"logoURL" : "uploads/episode/1622279206607.png",
"dateOfTelecast" : null,
"description" : "adfd",
"duration" : "30",
"videoType" : "customURL",
"embedCode" : "",
"url" : "https://youtu.be/kbpsXMUr7ss",
"liveboxChannel" : "",
"createdOn" : "2021-05-29T09:06:48.637Z",
"createdBy" : ObjectId("609cbf49ba46cc3924859ab5"),
"_id" : "9GKqXhxcH"
},}
I have more no of seasons. from the season collection,i have episode array under the name of Episode.
Now My frontend page required that episode array alone.
response = {episode: all the episode data} and this episode data is based on skip and limit value
I have tried something in mongodb,
db.getCollection('season_copy').aggregate([
{$project: {
episodes: {
$cond:{ if: { $isArray: "$episode" }, then: { input:"$episode" }, else: 0 }
},
},
},
])
Can anyone suggest me some idea?
Check this out:
Without aggregate:
db.getCollection('season_copy')
.find({ _id: ObjectID(id)})
.project({ episode: 1 }).toArray();
With aggregate:
MongoDB playground
db.getCollection('season_copy')
.aggregate([
{
$match: {
_id: ObjectId("60b1fc6d3c43f74e0c1dba92")
}
},
{
$project: {
episode: 1
}
}
])
I'm trying to remove document in two different collection using same id at same time. Is there any possibilities?
user collection:
{
"_id" : ObjectId("5a310315f685dd5038fecaaa"),
"userId" : 3,
"accountId" : 1,
"userType" : "DRIVER",
"firstName" : "Karthi",
"lastName" : "keyan",
"email" : "karthikeyan.a1#gmail.com",
"password" : "$2a$12$KFYc6riMnqTuzXhR0ssKZQmejAU4RF8FthAIQD4sgOUcALesp7DaJxK",
"phone" : "xyz",
"updatedAt" : ISODate("2017-12-13T10:38:13.492Z"),
"createdAt" : ISODate("2017-12-13T10:38:13.492Z"),
"__v" : 0
}
worker collection:
{
"_id" : ObjectId("5a310315f685dd5038fecaab"),
"workerId" : 1,
"accountId" : 1,
"name" : "Karthikeyan",
"email" : "karthikeyan.a1#gmail.com",
"mobile" : "xyz",
"type" : "DRIVER",
"joinDate" : ISODate("2017-12-13T10:38:13.070Z"),
"assignedVehicleId" : "23423231",
"licenseNumber" : "TN2506",
"createdBy" : "1",
"createdDate" : ISODate("2017-12-13T10:38:13.070Z"),
"updatedBy" : "1",
"updatedDate" : ISODate("2017-12-13T10:38:13.070Z"),
"regularHours" : 3600,
"regularRates" : 1500,
"overtimeRates" : 400,
"distanceRate" : 1000,
"stopRate" : 50,
"workerStatus" : "AVAILABLE",
"userId" : 3,
"__v" : 0
}
now i want to remove these two document at same time using userId.
Database adapters allow to call remove with null and a query that will remove all entries matching that query (see the documentation). In your case:
app.service('users').remove(null, { query: { userId: 3 } });
app.service('workers').remove(null, { query: { userId: 3 } });
Removing related entries (e.g. remove all workers for that user once the user has been removed) can be done in an after hook:
app.service('users').hooks({
after: {
async remove(context) {
const user = context.result;
await context.app.service('workers').remove(null, {
query: { userId: user.userId }
});
}
}
});
My database looks like
{
"chats" : {
"-K5hUtxNOPLWwRTb8fAj" : {
"clientId" : 893,
"messages" : {
"-K5hUtyCwWuPeFT0cSXr" : {
"chatKey" : "-K5hUtxNOPLWwRTb8fAj",
"messageText" : "new message",
"timestamp" : 1450314801055,
"userId" : "19eaa3f0-4ab3-44b4-b418-03b64ca2313a"
},
"-K5hUvwKsAOvuvt-ymFG" : {
"chatKey" : "-K5hUtxNOPLWwRTb8fAj",
"messageText" : "did this work",
"timestamp" : 1450314809127,
"userId" : "48f7a208-5647-4d0e-921c-c49595de1db2"
}
},
"newQuestion" : false,
"startedByUserId" : "19eaa3f0-4ab3-44b4-b418-03b64ca2313a"
},
"-K5hVKjs4SkSHD7WTh1I" : {
"clientId" : 518,
"messages" : {
"-K5hVNzPKNgxLCgkfInI" : {
"chatKey" : "-K5hVKjs4SkSHD7WTh1I",
"messageText" : "this is new",
"timestamp" : 1450314928109,
"userId" : "19eaa3f0-4ab3-44b4-b418-03b64ca2313a"
}
},
"newQuestion" : true,
"startedByUserId" : "19eaa3f0-4ab3-44b4-b418-03b64ca2313a"
}
}
}
How can I get all chats that have a newQuestion set to true? I've tried a few different queries, the latest is:
firebaseDb.child("chats/newQuestion").equalTo(true).once("value"...
But that complains about an order being needed for a boolean?
You have to specify an orderBy method first.
var query = firebaseDb.child("chats").orderByChild("newQuestion").equalTo(true);
Here's the Firebase docs on querying.
I am extremely new to mongodb and am facing a little trouble with an update operation. Here is the document:
{
"username" : "amitverma",
"notifications" : {
"notification_add_friend" : [
{
"sender" : "macbook",
"action" : "",
"type" : "",
"objectType" : "request",
"objectUrl" : "",
"isUnread" : true
},
{
"sender" : "safari",
"action" : "",
"type" : "",
"objectType" : "request",
"objectUrl" : "",
"isUnread" : true
},
{
"sender" : "chrome",
"action" : "",
"type" : "",
"objectType" : "request",
"objectUrl" : "",
"isUnread" : true
}
]
},
"_id" : ObjectId("526598c86f45240000000001")
}
{
"username" : "macbook",
"notifications" : {
"notification_add_friend" : [
{
"sender" : "amitverma",
"action" : "",
"type" : "",
"objectType" : "a_r",
"objectUrl" : "",
"isUnread" : true
}
]
},
"_id" : ObjectId("526598d06f45240000000002")
}
I want to remove the sub array with {"sender":"safari"} within "username":"amitverma"
I have tried $elemMatch with $set, but just couldn't get the query correctly.
You don't want to use $set here, but $pull (see docs), and while you could use $elemMatch to further specify your query, you do not need to.
The following would pull all add friend notifications with {"sender": "safari"} from the sub array of documents matching {"username": "amitverma"}
db.yourcollection.update({"username": "amitverma"}, {
$pull: {"notifications.notifications_add_friend": {"sender": "safari"}}
})
As to your comment, if you wanted to update a particular element you would use $set in combination with $elemMatch and the positional operator $. For your example, something like:
db.yourcollection.update({
"username": "amitverma",
"notifications.notifications_add_friend": {
$elemMatch: {"sender": "safari"}
}
}, {
$set: {
"notifications.notifications_add_friend.$.isUnread": false
}
})
I have a collection in which each object contains details of the user along with the comments user has given on specific products which is given below
{
"_id" : ObjectId("51efcbc8786df13540e46887"),
"value": {
"UserDetails" : [
[
{
"country" : "CA",
"gender" : "M",
"age" : "18",
"userIdtemp" : ObjectId("51efcbc8786df13540e46887")
}
]
],
"comments" : [
{
"commentId" : ObjectId("51efcc41786df13540e46891"),
"comment" : "Hey, what's up?",
"created" : ISODate("2013-07-24T12:44:49.400Z"),
"productId" : ObjectId("51efcbd4786df13540e4688c"),
"userId" : ObjectId("51efcbc8786df13540e46887")
},
{
"commentId" : ObjectId("51efcc43786df13540e46893"),
"comment" : "Cool",
"created" : ISODate("2013-07-24T12:44:51.004Z"),
"productId" : ObjectId("51efcbd2786df13540e4688b"),
"userId" : ObjectId("51efcbc8786df13540e46887")
}
]
}
}
{
"_id" : ObjectId("51efcbc8786df13540e46888"),
"value" : {
"UserDetails" : [
[
{
"country" : "US",
"gender" : "M",
"age" : "25",
"userIdtemp" : ObjectId("51efcbc8786df13540e46888")
}
]
],
"comments" : [
{
"commentId" : ObjectId("51efcc41786df13540e46892"),
"comment" : "Not much",
"created" : ISODate("2013-07-24T12:44:49.475Z"),
"productId" : ObjectId("51efcbd4786df13540e4688c"),
"userId" : ObjectId("51efcbc8786df13540e46888")
}
]
}
}
{
"_id" : ObjectId("51efcbc8786df13540e46889"),
"value" : {
"UserDetails" : [
{
"country" : "US",
"gender" : "F",
"age" : "13",
"userIdtemp" : ObjectId("51efcbc8786df13540e46889")
}
]
}
}
I have to extract comments separately along with there userDetails with key as productId so i have written map something like following
mapCommentsFrom = function(){
if("comments" in this.value)
{
for(var idx = 0;idx<this.value.comments.length;idx++){
var key = this.value.comments[idx].productId;
var value = [{
commentId: this.value.comments[idx].commentId,
comment:this.value.comments[idx].comment,
created:this.value.comments[idx].created,
productId:this.value.comments[idx].productId,
userId:this.value.comments[idx].userId,
country:this.value.UserDetails[0][0].country,
gender:this.value.UserDetails[0][0].gender,
age : this.value.UserDetails[0][0].age
}]
}
}
emit(key,value);
}
reduceFrom = function(k,values){
return values;
}
but where ever the number of comments are more than one i am getting only the last comment along with user details and other's key as well as value is coming null. Something like this
{ "_id" : null, "value" : null }
{
"_id" : ObjectId("51efcbd2786df13540e4688b"),
"value" : [
{
"length" : 2,
"commentId" : ObjectId("51efcc43786df13540e46893"),
"comment" : "Cool",
"created" : ISODate("2013-07-24T12:44:51.004Z"),
"productId" : ObjectId("51efcbd2786df13540e4688b"),
"userId" : ObjectId("51efcbc8786df13540e46887"),
"country" : "CA",
"gender" : "M",
"age" : "18"
}
]
}
{
"_id" : ObjectId("51efcbd4786df13540e4688c"),
"value" : [
{
"length" : 1,
"commentId" : ObjectId("51efcc41786df13540e46892"),
"comment" : "Not much",
"created" : ISODate("2013-07-24T12:44:49.475Z"),
"productId" : ObjectId("51efcbd4786df13540e4688c"),
"userId" : ObjectId("51efcbc8786df13540e46888"),
"country" : "US",
"gender" : "M",
"age" : "25"
}
]
}
Can somebody please help me as to what i am missing?
Thanks for help in advance
I cannot add comments due to reputation. But had you considered using the aggregation framework.
The $unwind operator will return you an array of sub documents quite easily and it's faster than using map/reduce.
I'm not sure it will exactly do what you're looking for but may help.
Take a look, http://docs.mongodb.org/manual/reference/aggregation/unwind/
Its because you are not emitting them in the map function.
Move the emit function inside the for loop.
mapCommentsFrom = function(){
if("comments" in this.value){
for(var idx = 0;idx<this.value.comments.length;idx++){
var key = this.value.comments[idx].productId;
var value = {
commentId: this.value.comments[idx].commentId,
comment:this.value.comments[idx].comment,
created:this.value.comments[idx].created,
productId:this.value.comments[idx].productId,
userId:this.value.comments[idx].userId,
country:this.value.UserDetails[0][0].country,
gender:this.value.UserDetails[0][0].gender,
age : this.value.UserDetails[0][0].age
}
emit(key,value);
}
}
}
Then you may also need to rewrite your reduce function to something like this
reduceFrom = function(k,valueArray){
var returnData = { values : [] } ;
for(var i=0;i<valueArray.length;i++)
returnData.values.push(valueArray[i]);
return returnData;
}
By far the easiest is to just use the aggregation framework for this. The aggregation framework allows you to execute operators on data, there is $match for doing queries (like find()) and various others. See for more information: http://docs.mongodb.org/manual/core/aggregation/
The aggregation framework also has an $unwind function that does exactly what you want. You use it like:
db.collection.aggregate( [
{ $unwind: '$value.comments' },
{ $project: {
_id: '$value.comments.productId',
value: 1
} }
] );
On your sample documents, this returns:
{
"result" : [
{
"_id" : ObjectId("51efcbd4786df13540e4688c"),
"value" : {
"UserDetails" : [
[
{
"country" : "CA",
"gender" : "M",
"age" : "18",
"userIdtemp" : ObjectId("51efcbc8786df13540e46887")
}
]
],
"comments" : {
"commentId" : ObjectId("51efcc41786df13540e46891"),
"comment" : "Hey, what's up?",
"created" : ISODate("2013-07-24T12:44:49.400Z"),
"productId" : ObjectId("51efcbd4786df13540e4688c"),
"userId" : ObjectId("51efcbc8786df13540e46887")
}
}
},
{
"_id" : ObjectId("51efcbd2786df13540e4688b"),
"value" : {
"UserDetails" : [
[
{
"country" : "CA",
"gender" : "M",
"age" : "18",
"userIdtemp" : ObjectId("51efcbc8786df13540e46887")
}
]
],
"comments" : {
"commentId" : ObjectId("51efcc43786df13540e46893"),
"comment" : "Cool",
"created" : ISODate("2013-07-24T12:44:51.004Z"),
"productId" : ObjectId("51efcbd2786df13540e4688b"),
"userId" : ObjectId("51efcbc8786df13540e46887")
}
}
},
{
"_id" : ObjectId("51efcbd4786df13540e4688c"),
"value" : {
"UserDetails" : [
[
{
"country" : "US",
"gender" : "M",
"age" : "25",
"userIdtemp" : ObjectId("51efcbc8786df13540e46888")
}
]
],
"comments" : {
"commentId" : ObjectId("51efcc41786df13540e46892"),
"comment" : "Not much",
"created" : ISODate("2013-07-24T12:44:49.475Z"),
"productId" : ObjectId("51efcbd4786df13540e4688c"),
"userId" : ObjectId("51efcbc8786df13540e46888")
}
}
}
],
"ok" : 1
}