i have the following method that get data from Firstore. then add these data into local like following ..
List <QueryDocumentSnapshot> finalResultsForMessgse = [] ;
future getData(){
FirebaseFirestore.instance.collection("product").get().then((value) {
value.docs.forEach((data) {
finalResultsForMessgse.add(data);
});
});
}
and my data look like following
as shown in red circle , i want to edit or replace sceptic value field doc from count:1 to count:2 for example.
Note: i need to edit values only the one i stored them into my local List and not in server
in other word : after i add data into my List, i need to edit on it
i tried this but that will not edit.
finalResultsForMessgse.where((element) => element.get('count')) // here i need to edit the value of count to 0
any good ways most welcome . thanks
Related
How can I listen to a specific field change with firestore js sdk ?
In the documentation, they only seem to show how to listen for the whole document, if any of the "SF" field changes, it will trigger the callback.
db.collection("cities").doc("SF")
.onSnapshot(function(doc) {
console.log("Current data: ", doc && doc.data());
});
You can't. All operations in Firestore are on an entire document.
This is also true for Cloud Functions Firestore triggers (you can only receive an entire document that's changed in some way).
If you need to narrow the scope of some data to retrieve from a document, place that in a document within a subcollection, and query for that document individually.
As Doug mentioned above, the entire document will be received in your function. However, I have created a filter function, which I named field, just to ignore document changes when those happened in fields that I am not interested in.
You can copy and use the function field linked above in your code. Example:
export const yourCloudFunction = functions.firestore
.document('/your-path')
.onUpdate(
field('foo', 'REMOVED', (change, context) => {
console.log('Will get here only if foo was removed');
}),
);
Important: The field function is not avoiding your function to be executed if changes happened in other fields, it will just ignore when the change is not what you want. If your document is too big, you should probably consider Doug's suggestion.
Listen for the document, then set a conditional on the field you're interesting in:
firebase.firestore().collection('Dictionaries').doc('Spanish').collection('Words').doc(word).collection('Pronunciations').doc('Castilian-female-IBM').onSnapshot(function(snapshot) {
if (snapshot.data().audioFiles) { // eliminates an error message
if (snapshot.data().audioFiles.length === 2) {
audioFilesReady++;
if (audioFilesReady === 3) {
$scope.showNextWord();
}
}
}
}, function(error) {
console.error(error);
});
I'm listening for a document for a voice (Castilian-female-IBM), which contains an array of audio files, in webm and mp3 formats. When both of those audio files have come back asynchronously then snapshot.data().audioFiles.length === 2. This increments a conditional. When two more voices come back (Castilian-male-IBM and Latin_American-female-IBM) then audioFilesReady === 3 and the next function $scope.showNextWord() fires.
Just out of the box what I do is watching before and after with the before and after method
const clientDataBefore = change.before.data();
console.log("Info database before ", clientDataBefore);
const clientDataAfter = change.after.data();
console.log("Info database after ", clientDataAfter );
For example now you should compare the changes for a specific field and do some actions or just return it.
Some more about before.data() and after.data() here
I am trying to use RESTful API to gather the data from a Google spreadsheet spreadsheet.
I read the document at https://developers.google.com/sheets/api/reference/rest/v4/spreadsheets.values/get but I cannot a way that allows me to specify a specific GID (tabs) of the spreadsheet.
After call the API, I was able to get a value from the first tab of the spreadsheet, but I want to change it to the second page (another GID)
Any help would be appreciated. Thanks.
Edit: Added example:
I have a sample spreadsheet here: https://docs.google.com/spreadsheets/d/1da3e6R08S8OoibbOgshyAQy7m9VRGPOrSGzVIvMSXf4/edit#gid=0
When I want to get the value on A1, I can call the RESTful API:
https://content-sheets.googleapis.com/v4/spreadsheets/1da3e6R08S8OoibbOgshyAQy7m9VRGPOrSGzVIvMSXf4/values/A1?key=API_KEY
And I will get:
{
"range": "Sheet1!A1",
"majorDimension": "ROWS",
"values": [
[
"This is on the first tab!"
]
]
}
But as you see in my spreadsheet, I have to tabs (sheet2), how can I get that value of "This is on the second tab!"?
To specify a specific GID (tabs) of the spreadsheet. Enter your 'sheet_name' with single quotes. Don't miss to add double quotes for range. Hope it helps
var query = {
auth: authClient,
spreadsheetId: 'spreadsheetID',
range: "'sheet1'!A1:D3",
};
$data[] = new Google_Service_Sheets_ValueRange([
'range' => 'MGM!A1:Z' . $rowNum,
'values' => $values
]);
MGM - is your tag name
I'm implementing algolia search in my site and i want to get a set of data matching any id's i send to the search, so i need to know how could i send more than one parameter to the search, so i can send a set of ids, something like this:
let client = algoliasearch(APP_ID, API_KEY),
index = client.initIndex(INDEX_NAME);
let term=["3223212","2423434"];
index.search(term, callback)
This is not working right now, have any idea? or even how could i achieve my goal using another algolia feautre like filtering for instance?
If you're trying to retrieve objects by their objectIDs (which you can manually set at creation time to match your database ids), you can simply use the getObjects method.
Extract from the documentation:
You can also retrieve a set of objects:
index.getObjects(['myObj1', 'myObj2'], function(err, content) {
console.log(content);
});
If you're trying to list all the records that belong to a group with a specific id, you can use a facet that will contain this id and filter on it.
Inside your record:
{
"group_id": "3223212",
// or
"group_ids": ["3223212", "2423434"]
}
Inside your index settings:
{
attributesForFaceting: [
'onlyFilter(group_id)'
]
}
At query time:
let ids = ["3223212", "2423434"];
let filters = ids.map(id => `group_id:${id}`).join(' OR ');
index.search('', { filters: filters }, callback);
I have a code that looks like this
Trades.find().observeChanges({
changed: function(id, fields) {
// do stuff
}
});
Where each Trades has an array of items inside
TradesSchema = new SimpleSchema({
// ...
items: {
type: [String]
},
// ...
});
Trades.attachSchema(TradesSchema);
These items are being changed sometimes, and I want to track the changes. The code works fine, except that in fields it returns all the items, not only the items that were changed.
Is there any way to see which exactly item was changed without changing the structure of the collection?
Thanks #Season for the hint!
observeChanges only gives the new values, so you have to use observe, since it returns both the new and old documents. Then you need to compare them to see what exactly got changed. (See docs for observe on meteor.com)
Trades.find().observe({
changed: function(newDocument, oldDocument) {
// compare newDocument to oldDocument to find out what has changed
}
});
I have utilised the example code at Example Code at this link
and I have got my grid to show a dynamically constructed select dropdown on add and edit. However when it is just showing the data in the grid it shows the dropdown index instead of its associated data. Is there a way to get the grid to show the data associated with the index instead of the index itself.
e.g. the data on my select could be "0:Hello;1:World"; The drop down on the edit/add window is showing Hello and World and has the correct indexes for them. If the cell has a value of 1 I would expect it to show World in the grid itself but it is showing 1 instead.
Here is the row itself from my grid:
{ name: 'picklist', index: 'picklist', width: 80, sortable: true, editable: true,
edittype: "select", formatter: "select", editrules: { required: true} },
I am filling the dynamic data content in the loadComplete event as follows:
$('#mygrid').setColProp('picklist', { editoptions: { value: picklistdata} });
picklist data is a string of "0:Hello;1:World" type value pairs.
Please can anyone offer any help. I am fairly new to JQGrids so please could you also include examples.
I know you have already solved the problem but I faced the same problem in my project and would like to offer my solution.
First, I declare a custom formatter for my select column (in this case, the 'username' column).
$.extend($.fn.fmatter, {
selectuser: function(cellvalue, options, rowdata) {
var userdata;
$.ajax({
url:'dropdowns/json/user',
async:false,
dataType:'json',
cache:true,
success: function(data) {
userdata = data;
}
});
return typeof cellvalue != 'undefined' ? userdata[cellvalue] : cellvalue ;
}
});
This formatter loads up the mapping of id and user in this case, and returns the username for the particular cellvalue. Then, I set the formatter:'selectuser' option to the column's colModel, and it works.
Of course, this does one json request per row displayed in the grid. I solved this problem by setting 10 seconds of caching to the headers of my json responses, like so:
private function set_caching($seconds_to_cache = 10) {
$ts = gmdate("D, d M Y H:i:s", time() + $seconds_to_cache) . " GMT";
header("Expires: $ts");
header("Pragma: cache");
header("Cache-Control: max-age=$seconds_to_cache");
}
I know this solution is not perfect, but it was adequate for my application. Cache hits are served by the browser instantly and the grid flows smoothly. Ultimately, I hope the built-in select formatter will be fixed to work with json data.
If you save in jqGrid ids of the select elements and want to show the corresponding textes then you should use formatter:'select' in the colModel (see http://www.trirand.com/jqgridwiki/doku.php?id=wiki:predefined_formatter#formatter_type_select) together with the edittype: "select".
The Usage of stype: 'select' could be also interesting for you if you plan to support data searching.