如何从 Firestore 获取数组值？

Question

I have the data structure illustrated below stored in Cloud Firestore. I have saved company record in Firestore database and i want to check my domain is exist in company's domain array or not and if yes then i want all company data in response but i have no idea how can i achieve this with Firestore.

Here i have marked domains. let me explain more, For Example if my domain name is "abcinfo.in" then i want to check that is it already exist with any partner_company domains or not and here it is linked with this partner_company so it should return me all data of partner_company. That's it.

I have tried with below code but it helps when there are single value but here i need to check from array

 var domaindata = db.collection('partner_company').where('company_domain', '==', _user.domain);
  domaindata.get().then(function (querySnapshot) {
    querySnapshot.forEach(function (doc) {
      console.log(doc.id, ' => ', doc.data());
    });
  });

So please suggest me any better way to achieve data that i want. Thank you.

Answer 1

Firebase comes with a neat feature for array filtering: array-contains and array-contains-any . They can be used as a query operator.

Use array-contains to filter arrays for values that have to match perfectly. The following query would resolve your test document:

db.collection('partner_company').where('company_domain', 'array-contains', ['abcinfo.in', 'newtest.com'];

array-contains-any on the other side filters for at least one matching value.

db.collection('partner_company').where('company_domain', 'array-contains-any', ['definfo.in', 'newtest.com'];

Read more about array membership in firebase here

Answer 2

You can do the following:

var domaindata = db.collection('partner_company').where('company_domain', 'array-contains', _user.domain);

This will check if the array company_domain contains the domain passed.

Check the following:

https://firebase.google.com/docs/firestore/query-data/queries#array_membership