Filter list based on Array value

#1

Hi guys. Probably I’m missing something here. The script above works perfectly in the case of a pure string. What I am trying to achieve now is doing the same, but this time check an Array. The list is actually a list of favorites where you find the Array with users uid.

favorites [{“uid":"jTIXVM2nCjVGuih99LJToS2zSZ43”}]

However, something is going wrong and what I see as a result is TypeError: Cannot read property ‘includes’ of undefined. And of course, nothing listed.
I tried
let favorite = JSON.stringify(this.props.likes) and then

let filteredItems = [];
items.forEach(item => {
if (item[favorites].includes(this.props.appActions.dataSlots[‘ds_SlotUserID’])) {
filteredItems.push(item);
}
});
items=filteredItems;
return items;

//

Can you guys please help me here finding the right way to do this?

Best Regards, Marcos

#2

The error message means that item[favorites] is giving you ‘undefined’ thus includes method can’t be called. What values the favorites variable should have? Looks like it’s causing some problems.

#3

Hi Juha, thanks for your quick reply. The value have the user uid inside an Array that looks likes this: note: The includes method works fine if is not an Array/object. I tried so many ways and just couldn’t find a way the problem supposedly easy to be solve. Thanks for your help.

[{“uid":"jTIXVM2nCjVGuih99LJToS2zSZ43”}]

Screen Shot 2020-12-05 at 12.37.54 PM
Screen Shot 2020-12-05 at 12.37.54 PM1022×142 7.62 KB

#4

This issue is solved like this using the template

const db = firebase.firestore();
let ThreadId = this.props.appActions.dataSlots[‘ds_SlotThreadID’]
const ref = db.collection(‘Threads’).doc(ThreadId).collection(‘Proposals’)
.where(‘likes’, ‘array-contains’, {“uid”: uid})

thanks anyway

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