How could I query this data in this way:
I would like to ignore the CurrentSubAdministrativeArea child and iterate every each sub child and find the right userKey
Actually I'm using this code, that isnt working:
self.ref.child("Ads").child("CurrentSubAdministrativeArea")
/*HERE I would like to ignore the childs*/
.queryOrdered(byChild: "userKey").queryEqual(toValue: uid).observeSingleEvent(of:.value, with: { (snapshot) in
--
{
"Ads" : {
"CurrentSubAdministrativeArea" : {
"Mantova" : {
"-L7ymBmmbHkNfhBRte9F" : {
"cost" : 200,
"date" : 1527256922000,
"info" : "Test",
"maxLimit" : 100,
"minLimit" : 10,
"personBadType" : [ "abitudinaria", "antipatica" ],
"personGoodType" : [ "simpatica", "felice" ],
"subAdministrativeArea" : "Mantova",
"title" : "Mantova Test",
"url" : "https://firebasestorage.googleapis.com/v0/b/team-34540.appspot.com/o/Mantova%20Test?alt=media&token=3a81ed1c-ecd6-4dc0-bd7c-45e093ce8188",
"userKey" : "OsJRc98sqxPx70iqxFtoqerMzHH2",
"via" : "viale dei test"
}
},
"Milano" : {
"-L6qywMC6nxi0fJNMHba" : {
"cost" : 454,
"date" : 1528298580000,
"info" : "Di pollo",
"maxLimit" : 100,
"minLimit" : 10,
"personBadType" : [ "abitudinaria", "antipatica" ],
"personGoodType" : [ "simpatica", "felice" ],
"subAdministrativeArea" : "Milano",
"title" : "Pollo 2",
"url" : "https://firebasestorage.googleapis.com/v0/b/team-34540.appspot.com/o/Pollo?alt=media&token=fc6a3ec8-5f9a-4347-bdad-2d9715af784d",
"userKey" : "OsJRc98sqxPx70iqxFtoqerMzHH2",
"via" : "viale test"
}
}
}
}
}
You could denormalize your data in such a way your query is easy to build and execute.
Together with the data structure you already have you would have another node (ie. another data structure) like
{
"AdsByUsers" : {
"OsJRc98sqxPx70iqxFtoqerMzHH2": {
"Mantova",
"Milano",
...
},
"abcde88qxPx70iqxFtoqerMzKh5": {
"Firenze",
...
}
With NoSQL database you should not hesitate to duplicate data in such a way your queries are easy and fast to execute.
Related
Here is my database entry structure, it has a nested document called friends, I want to compare two different _id's friends list in dart using mongo_dart
{
"_id" : ObjectId("60ae06074e162995281b4666"),
"email" : "one#one.com",
"emailverified" : false,
"username" : "one#one.com",
"displayName" : "complete n00b",
"phonenumber" : "",
"dob" : "",
"points" : 0,
"friends" : [
{
"username" : "three#one.com",
"sent" : ISODate("2021-05-26T10:01:30.616Z")
},
{
"username" : "six#one.com",
"sent" : ISODate("2021-05-26T10:43:16.822Z")
}
]
}
Here is my code, but I am not getting any returns
Future<Map> commonFriends(store, myObjectId, theirObjectId) async {
var commonList = await store.aggregate([
{
'\$project': {
'friends': 1,
'commonToBoth': {
'\$setIntersection': [
{'_id': myObjectId, 'friends': '\$username'},
{'_id': theirObjectId, 'friends': '\$username'}
]
},
}
}
]);
return commonList;
}
I am getting an error from db.dart which is apart of mongo_dart package. The error is "Exception has occurred.
Map (4 items)"
I have a simple test database that I cant get to filter. I indexed the category in the rules:
"questions":{
".indexOn": ["category"]
},
My filter for the quiz app:
/questions.json?orderBy="category"&equalTo="Basics"&print=pretty
and my database:
"-MKoucSP33zm4jC43AnY" : {
"title" : {
"answers" : [ {
"score" : 30,
"text" : "Pineapple"
}, {
"score" : 5,
"text" : "Ham"
}, {
"score" : 20,
"text" : "Yogurt"
}, {
"score" : 10,
"text" : "Crab"
} ],
"category" : "Basics",
"questionId" : "101",
"questionImage" : "",
"questionLink" : "",
"questionText" : "What topping do you like the best on pizza?"
}
}
The category property is nested under the title node, so the property you need to order/filter on is title/category:
/questions.json?orderBy="title/category"&equalTo="Basics"&print=pretty
You'll also need to update your index definition for that path, so:
"questions": { ".indexOn": "title/category" }
Working example: https://stackoverflow.firebaseio.com/64596200/questions.json?orderBy="title/category"&equalTo="Basics"
I have this database on Firebase:
{
"issues" : {
"-L04771_EjrLlv5u1-GU" : {
"issue" : "Test insert 1",
"last_edit" : "d8QICgTG5xR20RBzAXfzfu8gLgw2",
"owner" : "d8QICgTG5xR20RBzAXfzfu8gLgw2",
"owner_email" : "example1#gmail.com",
"status" : 1,
"url" : "http://www.example.com/example.html"
},
"-L047pIoqxkj4saaTYyQ" : {
"issue" : "Test insert 2",
"last_edit" : "d8QICgTG5xR20RBzAXfzfu8gLgw2",
"owner" : "d8QICgTG5xR20RBzAXfzfu8gLgw2",
"owner_email" : "example2#gmail.com",
"status" : 1,
"url" : "http://www.example.com/example.html"
}
}
}
I have to extract only those who have owner_email "example1#gmail.com".
Is possible?
You're probably looking for Firebase Queries and especially the equalTo-Query.
Your code would be something like this:
// Find all issues with owner_email = example1#gmail.com
var ref = firebase.database().ref("issues");
ref.orderByChild("owner_email").equalTo("example1#gmail.com").on("value", function(snapshot) {
// Loops through the matching issues
snapshot.forEach(function(child) {
console.log(child.key);
});
});
I want to sort my query results following some boost rules and in the same time i want them to be sorted as possible by creation date, if i add a created_at sort, it changes everything and my results are not relevant anymore. So i guess the only way to do that is to boost created_at field (the newest has the biggest bonus in calculating score for that boost) but i dont know how to implement it. This is my query:
query = {
"query" : {
"bool" : {
"must" : [
{
"range" : {
"deadline" : {
"gte" : "2016-05-30T11:39:10+02:00"
}
}
},
{
"terms" : {
"state" : [
"open"
]
}
},
{
"query_string" : {
"query" : "chant",
"default_operator" : "AND",
"analyzer" : "search_francais",
"fields" : [
"title^6",
"description",
"brand",
"category_name"
]
}
}
]
}
},
"filter" : {
"and" : [
{
"geo_distance" : {
"distance" : "40km",
"location" : {
"lat" : 48.855736,
"lon" : 2.32927300000006
}
}
}
]
},
"sort" : [
{
"_score" : "desc"
},
#{
# "created_at" : "desc" ==> i tried this but it doesnt change results
#}
]
}
Try adding your condition in should block.
i)If the created date should be closer to come value in the search query or you have any idea on how close the date should be, give a range query.
ii) If you are not sure of all those values, decay function can be used. In this case, query shall be changed to function query.
{
"query" : {
"bool" : {
"must" : [
{
"range" : {
"deadline" : {
"gte" : "2016-05-30T11:39:10+02:00"
}
}
},
{
"terms" : {
"state" : [
"open"
]
}
},
{
"query_string" : {
"query" : "chant",
"default_operator" : "AND",
"analyzer" : "search_francais",
"fields" : [
"title^6",
"description",
"brand",
"category_name"
]
}
}
],
"should": [
{"created_at" : "condition here .. "}
]
}
},
"filter" : {
"and" : [
{
"geo_distance" : {
"distance" : "40km",
"location" : {
"lat" : 48.855736,
"lon" : 2.32927300000006
}
}
}
]
}
}
I want to retrieve data from a JSON file with SwiftyJSON and Alamofire. This is the JSON data:
json: {
"data" : {
"monitors" : [
{
"lines" : [
{
"towards" : "LEOPOLDAU",
"realtimeSupported" : true,
"departures" : {
"departure" : [
{
"departureTime" : {
"countdown" : 2,
"timePlanned" : "2015-09-09T18:47:03.000+0200",
"timeReal" : "2015-09-09T18:47:03.000+0200"
}
},
{
"departureTime" : {
"countdown" : 6,
"timePlanned" : "2015-09-09T18:51:03.000+0200",
"timeReal" : "2015-09-09T18:51:03.000+0200"
}
}
]
},
"lineId" : 301,
"platform" : "1",
"trafficjam" : false,
"richtungsId" : "1",
"direction" : "H",
"type" : "ptMetro",
"name" : "U1",
"barrierFree" : true
}
],
"attributes" : {
},
"locationStop" : {
"type" : "Feature",
"geometry" : {
"type" : "Point",
"coordinates" : [
16.4330680046932,
48.2430825589716
]
},
"properties" : {
"municipality" : "Wien",
"title" : "Kagran",
"coordName" : "WGS84",
"municipalityId" : 90000,
"type" : "stop",
"gate" : "1",
"name" : "60200627",
"attributes" : {
"rbl" : 4127
}
}
}
}
]
}
,
"message" : {
"value" : "OK",
"serverTime" : "2015-09-09T18:45:08.998+0200",
"messageCode" : 1
}
}
What I want to do now is get the data of lines into an array. I tried several combinations for that, e.g.
let departureArray = jsonData["data"]["monitors"][0]["lines"][0].array
or
let departureArray = jsonData["data"]["monitors"]["lines"].array
but my array is always empty. Does anyone has an idea how to do this properly?
Your expected array departureArray is in fact a dictionary
let departureDictionary = jsonData["data"]["monitors"][0]["lines"][0].dictionary