I am using firestore in flutter. I have to create a group like whatsapp group for that I'm getting group name, group currency,group admin and a list of members which includes fullname and phonenumber as you can see
groupadmin : "+923009399237"
groupcurrency : "USD"
groupmembers : "[
{"fullname":"ABC",
"phonenumber":"+923475894561"
},
{"fullname":"ASD",
"phonenumber":"+922222222211"
}
]"
groupname : "First Group"
I have tried something like this but it doesn't work.
Firestore.instance
.collection('groups')
.where("groupmember.phonenumber", isEqualTo: 090909090)
.snapshots()
.listen((data) {
if (data.documents.length > 0) {
}
Is there anyway to directly find the group which has member with phonenumber == 0909090909. Please help me out in this.
Worth noting that you can also add exists to your Firestore rules as well. This way you can call a Firebase Function that relies on data existing, and then safely handle success/errors by placing things within a try/catch. Note that exists counts as a Firestore read (for billing purposes).
e.g.
allow create: if exists(/databases/$(database)/documents/users/$(request.auth.uid))
See: https://firebase.google.com/docs/firestore/security/rules-conditions
Use property exists:
Firestore.instance
.collection('groups')
.where("groupmember.phonenumber", isEqualTo: 090909090)
.snapshots()
.listen((data) {
if (data.exists) console.log("Yeah !");
}
See also: What's the best way to check if a Firestore record exists if its path is known?
And please read the doc before posting https://firebase.google.com/docs/firestore
Related
I am trying to search my database using a string, such as "A". I was just watching this Firebase tutorial Common SQL Queries converted for the Firebase Database - The Firebase Database For SQL Developers #4 and it explains that, in order to search the database for a string (in a certain location), you must use:
firebase.database().ref.child("child_name_here")
.queryOrdered(byChild: "child_name_here")
.queryStarting(atValue: "value_here_uppercase")
.queryEnding(atValue: "value_here_uppercase\\uf8ff")
You must use two \\ in the ending value as an escape character in order to get one \.
When I try this with my Firebase database, it does not work. Here is my database:
{
"Schools": {
"randomUID": {
"location" : "anyTown, anyState",
"name" : "anyName"
}
}
}
Here is my query:
databaseReference.child("Schools")
.queryOrdered(byChild: "name")
.queryStarting(atValue: "A")
.queryEnding(atValue: "A\\uf8ff") ...
When I go to print the snapshot from Firebase, I get back.
If I get rid of the ending .queryEnding(atValue: "A\\uf8ff"), the database returns all of the schools in the Schools node.
How can I search the Firebase database using a String?
queryStarting() and queryEnding() can be used for number. For example: you can get objects with someField varying from 3 to 10.
for searching string: you can search whole string using queryEqualToValue().
This shows all customers that match Wick. (It's not swift but may give you an idea)
// sample
let query = 'Wick'
clientsRef.orderByChild('name')
.startAt(query)
.endAt(query + '\uf8ff')
.once('value', (snapshot) => {
....
})
I develop web application with golang.
I use the library gocraft/dbr as O/R Mapper.
I have two tables: image and entry.
I join their tables and I want to get image_url.
type Image struct {
ImageUrl dbr.NullString `db:"image_url"`
}
type Entry struct {
CompanyImageID dbr.NullInt64 `db:"company_image_id"`
CompanyImage Image
EyecatchIamgeID dbr.NullInt64 `db:"eyecatch_image_id"`
EyecatchImage Image
}
Then I tried below:
var entry Entry
sess.Select("*").From("entry").
LeftJoin(dbr.I("image").As("eyecatch_image"), "entry.eyecatch_image_id = eyecatch_image.id").
LeftJoin(dbr.I("image").As("company_image"), "entry.company_image_id = company_image.id").
Load(&entry)
log.Println("company:", entry.CompanyImage)
log.Println("eyecatch:", entry.EyecatchImage)
result:
company: {{{https://company_image_url.png true}}}
eyecatch: {{{ false}}}
I expect below, but it did not become as expected.
company: {{{https://company_image_url.png true}}}
eyecatch: {{{{http://eyecatch_image_url.png true}}}
When I tried to change join condition like below:
sess.Select("*").From("entry").
LeftJoin(dbr.I("image").As("eyecatch_image"), "entry.eyecatch_image_id = eyecatch_image.id")
Load(&entry)
result:
company: {{{http://eyecatch_image_url.png true}}}
eyecatch: {{{ false}} {{ false}}}}
I don't know how to use join with multiple conditions.
Thank you.
The documentation is really poor - it seems they gave up on the idea of publishing the library. There is an open pull request that provides a little better documentation.. Here the author describes that you can create a multiple condition like this:
cond:= dbr.And(
dbr.Or(
dbr.Gt("created_at", "2015-09-10"),
dbr.Lte("created_at", "2015-09-11"),
),
dbr.Eq("title", "hello world"),
)
Then use the condition in any statement:
sess.Select("*").From("entry").
LeftJoin(dbr.I("image").As("eyecatch_image"), cond)
Load(&entry)
I'm using Postman to make REST API calls to a server. I want to make the name field dynamic so I can run the request with a unique name every time.
{
"location":
{
"name": "Testuser2", // this should be unique, eg. Testuser3, Testuser4, etc
"branding_domain_id": "52f9f8e2-72b7-0029-2dfa-84729e59dfee",
"parent_id": "52f9f8e2-731f-b2e1-2dfa-e901218d03d9"
}
}
In Postman you want to use Dynamic Variables.
The JSON you post would look like this:
{
"location":
{
"name": "{{$guid}}",
"branding_domain_id": "52f9f8e2-72b7-0029-2dfa-84729e59dfee",
"parent_id": "52f9f8e2-731f-b2e1-2dfa-e901218d03d9"
}
}
Note that this will give you a GUID (you also have the option to use ints or timestamps) and I'm not currently aware of a way to inject strings (say, from a test file or a data generation utility).
In Postman you can pass random integer which ranges from 0 to 1000, in your data you can use it as
{
"location":
{
"name": "Testuser{{$randomInt}}",
"branding_domain_id": "52f9f8e2-72b7-0029-2dfa-84729e59dfee",
"parent_id": "52f9f8e2-731f-b2e1-2dfa-e901218d03d9"
}
}
Just my 5 cents to this matter. When using randomInt there is always a chance that the number might eventually be present in the DB which can cause issues.
Solution (for me at least) is to use $timestamp instead.
Example:
{
"username": "test{{$timestamp}}",
"password": "test"
}
For anyone who's about to downvote me this post was made before the discussion in comments with the OP (see below). I'm leaving it in place so the comment from the OP which eventually described what he needs isn't removed from the question.
From what I understand you're looking for, here's a basic solution. It's assuming that:
you're developing some kind of script where you need test data
the name field should be unique each time it's run
If your question was more specific then I'd be able to give you a more specific answer, but this is the best I can do from what's there right now.
var counter = location.hash ? parseInt(location.hash.slice(1)) : 1; // get a unique counter from the URL
var unique_name = 'Testuser' + counter; // create a unique name
location.hash = ++counter; // increase the counter by 1
You can forcibly change the counter by looking in the address bar and changing the URL from ending in #1 to #5, etc.
You can then use the variable name when you build your object:
var location = {
name: unique_name,
branding_domain_id: 'however-you-currently-get-it',
parent_id: 'however-you-currently-get-it'
};
Add the below text in pre-req:
var myUUID = require('uuid').v4();
pm.environment.set('myUUID', myUUID);
and use the myUUID wherever you want
like
name: "{{myUUID}}"
It will generate a random unique GUID for every request
var uuid = require('uuid');
pm.globals.set('unique_name', 'testuser' + uuid.v4());
add above code to the pre-request tab.
this was you can reuse the unique name for subsequent api calls.
Dynamic variable like randomInt, or guid is dynamic ie : you donot know what was send in the request. there is no way to refer it again, unless it is send back in response. even if you store it in a variable,it will still be dynamic
another way is :
var allowed = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
var shuffled_unique_str = allowed.split('').sort(function(){return 0.5-Math.random()}).join('');
courtsey refer this link for more options
In couchbase, I was wondering if there was a way - WITHOUT using a view - to iterate through database keys. The admin interface appears to do this, but maybe its doing something special. What I'd like to is make a call like this to retrieve an array of keys:
$result = $cb->get("KEY_ALBERT", "KEY_FRED");
having the result be an array [KEY_ALEX, KEY_BOB, KEY_DOGBERT]
Again, I don't want to use a view unless there's no alternative. Doesn't look like its possible, but since the "view documents" in the admin appears to do this, I thought i'd double-check. I'm using the php interface if that matters.
Based on your comments, the only way is to create a simple view that emit only the id as par of the key:
function(doc, meta) {
emit( meta.id );
}
With this view you will be able to create query with the various options you need :
- pagination, range, ...
Note: you talk about the Administration Console, the console use an "internal view" that is similar to what I have written above (but not optimized)
I don't know about how couchbase admin works, but there are two options. First option is to store your docs as linked list, one doc have property (key) that points to another doc.
docs = [
{
id: "doc_C",
data: "somedata",
prev: "doc_B",
next: "doc_D"
},
{
id: "doc_D",
data: "somedata",
prev: "doc_C",
next: "doc_E"
}
]
The second approach is to use sequential id. You should have one doc that contain sequence and increment it on each add. It would be something like this:
docs = [
{
id: "doc_1",
data: "somedata"
},
{
id: "doc_2",
data: "somedata"
}
...
]
In this way you can do "range requests". To do this you form array of keys on server side:
[doc_1, doc_2 .... doc_N]and execute multiget query. Here is also a link to another example
The couchbase PHP sdk does support multiget requests. For a list of keys it will return an array of documents.
getMulti(array $ids, array $cas, int $flags) : array
http://www.couchbase.com/autodocs/couchbase-php-client-1.1.5/classes/Couchbase.html#method_getMulti
Earlier I asked about gathering information from API-Link, and I have managed to get out most of the details by using the answar I got.
Now ny problem is when another API to get more information
This time the file will contain this information:
{
"username":"UserName",
"confirmed_rewards":"0",
"round_estimate":"0.00000000",
"total_hashrate":"0.000",
"payout_history":"0",
"round_shares":"0",
"workers":{
"UserName.1":{
"alive":"0",
"hashrate":"0.000"
},
"UserName.2":{
"alive":"0",
"hashrate":"0.000"
},
"UserName.3":{
"alive":"1",
"hashrate":"1517.540",
"last_share_timestamp":1369598007
},
"UserName.4":{
"alive":"0",
"hashrate":"0.000"
}
}
}
And I want to gather each of the workers and print them out. This "workers" could contain multiple information, but always start with "UserName.x", where the username come from the "username" paramter each time.
The numbers will always vary from 0 and up
I want to gether the information in the same way by accessing the document, and decode and print out all the workers, whatever the numbers of them are.
By using the script provided in my last question(look at the link in the start), i was thinking that it would be something like
local t = json.decode( txt )
print("Workers: ".. t["workers.UserName.1"])
But this was not the way.
Due to the username changing all the time, I was also thinking somthing like
print("Workers: ".. t["workers" .. "." .. "username" .. "." .. "1"])
From here I have no clue about how I should gather the information, even when the names and numbers vary
Thanks in advance
Here is the perfect solution:
local json = require "json"
local t = json.decode( jsonFile( "data.json" )
local workers = t.workers
for name, user in pairs(workers) do
print("--------------------")
print(name)
for tag, value in pairs(user) do
print(tag , value)
end
end
Here are some more info:
http://www.coronalabs.com/blog/2011/08/03/tutorial-exploring-json-usage-in-corona/
http://www.coronalabs.com/blog/2011/06/21/understanding-lua-tables-in-corona-sdk/
http://lua-users.org/wiki/TablesTutorial