Refine search results based on various attributes for products using Firebase

Recently, I inquired about how to filter products based on their child property. You can find the original question here: Filter products based on the sub child in Firebase.

To summarize, my data structure is as follows:

products/
     product1
        /author: 12345
        /title: "Awesome"
        /category: "catA"
        /description: "more awesome"
     product2
        /author: 67890
        /title: "Other"
        /category: "catB"
        /description: "otherawesome"
     product3
        /author: 12345
        /title: "Billy"
        /category: "catB"
        /description: "otherawesome"

To filter out all products with author 12345, you can use the following query:

ref.child("products").orderByChild('author').equalTo(12345)...

But what if you need to use multiple AND or OR statements?

For example, how do you filter for:

  • all products with author 12345 AND category catA (resulting in product1)

  • all products with author 12345 OR author 67890 (resulting in product1 and product3)

I attempted the following query for the first scenario:

ref.child("products").orderByChild('author').equalTo(12345).orderByChild('category').equalTo('catA')...

Unfortunately, this resulted in an error (

You can't combine multiple orderBy calls
).

For more information, you can refer to: https://www.firebase.com/docs/web/guide/retrieving-data.html#section-queries

javascriptangularjsfirebasenosql

Answer №1

After researching extensively, I stumbled upon this insightful article that sheds light on the best approach to handling multiple where clauses in Firebase queries. The suggested method involves executing the initial query (ideally one with minimal results) and then applying JavaScript filters based on additional criteria. Alternatively, you can optimize this process by establishing a compound index for your query. An exemplary demonstration of this technique is provided in Frank van Puffelen's comprehensive explanation highlighted in the linked source.

products/
     product1
        /author: 12345
        /title: "Awesome"
        /category: "catA"
        /description: "more awesome"
        /author_category: "12345_catA"
     product2
        /author: 67890
        /title: "Other"
        /category: "catB"
        /description: "otherawesome"
        /author_category: "67890_catB"
     product3
        /author: 12345
        /title: "Billy"
        /category: "catB"
        /description: "otherawesome"
        /author_category: "12345_catB"

In terms of incorporating an 'OR' condition, my exploration did not yield any definitive solutions. Hence, my recommendation would be to execute two distinct queries to meet your specified criteria.

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