firebase delete object from field array by index

Question

How to delete object from array field by array index? or suggest another way!

i want to choose object from files array and delete!

Nimna Perera · Accepted Answer · 2021-03-09 07:42:29Z

1

There is no choose and delete method from an array in cloud firestore. What you can do is get that array to a temporary array and remove the object that you need to delete from the array and overwrite the document array field with your newly updated temporary array.

const deleteObjFromArr = async (index) => {
    try {
        /*
         * Get the files array to a temporary array.
         * If you have already gotten the document to an object,
         * assign the object field to the temporary array
         */
        
        const docRef = firebase.firestore().collection('tasks-collection').doc('tasks');
        const tempArr = (await docRef.get()).files;
        
        // Remove object from array
        tempArr.splice(index, 1);
        
        // Save new array in cloud firestore
        await docRef.update({ files: tempArr });
        console.log('Files array updated successfully');
        
    } catch (err) {
        console.log('Error occured. Operation terminated.');
        console.log(err);
    }
}

answered Mar 9, 2021 at 7:42

Nimna Perera

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2 Comments

Aw KingOftheworld Over a year ago

Now i got another problem, i realise that delete by index bad idea, cause index will change anyway after removal, maybe possible somehow find by some keyword inside array and delete whole array element?

Nimna Perera Over a year ago

yes @AwKingOftheworld, you can. You can use filter method of array to filter out the array which do not have that finding key. tempArr = tempArr.filter(e => e.attributeName != findingKeyword)

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