Firebase(firestore) update data with array - javascript

What I should do to change the status value in the document specified in the desired collection groups.

You can't update a single property on a specific item in the array. You will have to:
Read the entire document into you application code.
Get the current value of the data array from the document.
Update item 0 in the data array in the application code.
Write the entire data array back to the database.

Related

How to update element of any particular index in an array in MongoDb using mongoose in Node.js

Hi I tried to update the element at a particular index in an array but I'm not able to update it. It is updating the entire array. Not able to figure out how to update any particular index which is being passed by user. Let say user pass index from frontend as 1 then only the element at index 1 in appointment array gets updated not other.
Let say I have a schema in which I have Data who's type is array and default value is as shown below or anything in the same format.
Data: {
type: Array,
Default: ["0","1","0"]
}
Whenever I'll create a user then Data field will contain these default values, But now I want to update the value at index 1 of Data array of any user created.
I tried findByIdAndUpdate method but I don't know what to pass in set property. If I'm passing this {$set: req.body} and In postman I'm giving any value of Data then obviously it is updating Data array but I want to update value at any index how should I do that. What changes I have to make in {$set : }? Or any other method for that? Thanks in advance.
Waiting for any help or suggestions. Thanks

How can I update an object inside of an array in firestore?

I would like to update the completed property of an object in an array in Firestore, but I have no idea how to reach that specific element in the array. The image will show the structure.
I have come up this far but don't know how to choose, for example, item 1 in the array. I was thinking of using its ID (it has an id property) but don't know how to get there.
const businessRef = db.collection('approvedBusinesses').doc(businessId)
try {
businessRef.update({
[`bookings.${currentDate} ????? `]: true // what to add after currentDate?
})
By the way, this is how the array was created (and how other objects are pushed to it)
const bookingObj = {
carro: 'PASSA_CARRO',
completed: false,
userId: userObject.uid,
}
businessRef.update({
[`bookings.${currentDate}`]: firebase.firestore.FieldValue.arrayUnion(bookingObj),
})
Firestore does not have an operation that allows you to update an existing item in an array by its index.
To update an existing item in the array, you will need to:
Read the entire document into your application.
Modify the item in the array in your application code.
Write back the entire array to the document.
I'm pretty sure this has been asked before, so let me see if there's an answer with an example.
Also see:
How to remove an array element according to an especific key number?
Simple task list ordering - how to save it to Firebase Firestore?
How to update only a single value in an array
How to update an "array of objects" with Firestore?

Sync JSON from DOM

I using react for my project. I rendering the page based on JSON.
The page has various component types from image to text Content.
Each component has delete option, image can be changed from desktop and text content can be changed by contenteditable.
On performing these actions, the JSON should be updated immediately, later based on an action I would save the modified JSON.
I don't want to write onchange handler for each component, instead as data loads from JSON, it's key map should return or update the respected JSON value.
I am storing the JSON in variable. If required I'm okay to stringify.
Store the JSON in a state property. The key of each component will be its index in the array that you will extract from the JSON. Every time you click the "delete" button, pass the key to the onChange function.
In the onChange function, destructure the JSON and save it into a temp variable. Delete the JSON object at the specified index from the JSON array. Set that temp variable back to state.

How to increment a map value in a Firestore array

I have a firestore firebase database , in which I have a collection users
there is an array in the collection and in the array there is a map
in map there is a field qty.. I want to increment that qty value..
using increment doesnt help as the qty is inside a array index
db.collection("users").doc(checkId).update({
myCart: firebase.firestore.FieldValue.arrayUnion({
qty: firebase.firestore.FieldValue.increment(1),
}),
this is the error Output =>
Uncaught (in promise) FirebaseError: Function FieldValue.arrayUnion() called with invalid data. FieldValue.increment() can only be used with update() and set()
My answer below won't work, given that the qty is in an array. The only way to update an item in an array is to read the entire document, update the item in the array, and then write the entire array with the updated item back to the document.
An alternative would be to use a map instead of an array, and then update the qty using the approach outlined in my (old, and non-working) answer below 👇
You need to specify the full path to the field you're trying to update. So I think in your case, that'll be:
db.collection("users").doc(checkId).update({
"myCart.0.qty": firebase.firestore.FieldValue.increment(1)
}),
The field you want to update is embedded in an array. In this case, you can't use FieldValue.increment(), since it's not possible to call out an array element as a named field value.
What you'll have to do instead is read the entire document, modify the field in memory to contain what you want, and update the field back into the document. Also consider using a transaction for this if you need to update to be atomic.
(If the field wasn't part of an array, you could use FieldValue.increment().)
As of today (29-04-2020)... this is tested by me.
Suppose my data structure is like this:
collection: Users
Any document: say jdfhjksdhfw
It has a map like below
map name: UserPageVisits
map fields: field1,field2,field3 etc
Now we can increment the number field in the map like below:
mapname.field1 etc...
That is use the dot operator to access the fields inside the map just like you would do to an object of javascript.
JAVA Code (Android), update the field using transactions so they can complete atomically.
transaction.update(<documentreference object>,"UserPageVisits.field1",FieldValue.increment(1));
I have just pushed a version of my app which uses this concept and it's working.
Kudos !!
My Best Regards
Previous answers helped me as well, but dont forget about the "merge" property!!! Otherwise it will overwrite your entire array, losing other fields.
var myIndex = 0;
const userRef = db.collection('users').doc(checkId);
return userRef.update({
'myCart.${myIndex}.qty': admin.firestore.FieldValue.increment(1)
}, {
merge: true
});

Managing nested dependent data in Knockoutjs

I have a JSON object which contains models array. Each model contain params array and each param contain values. values should displayed on page as radiobuttons or selects and user can choose it. I need to build HTML so that if user chooses the value then variable selectedValues keeps object like this {param_id: value_id, another_param_id: another_value_id} e.t.c. This variable should show what values for which parameters selected by the user. The problem is i don't know how many params and how many value will come - it's fully dynamic JSON, generated by server.
Demo fiddle
http://jsfiddle.net/z68tx53c/1
If you are using selectedValues()[1] when selectedValues() is null (which you are, before it's populated), you will get this error: Cannot read property '1' of undefined . Wrap the html which uses selectedValues in a with or if binding, so that the containing nodes are only there when selectedValues is non null.

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