Query data from firebase with parameters - React

Question

I have a React application which is using firebase as the back-end. Here is an snapshot of my data structure.

The numbers 1001, 1002, 1003 represent the ID of each entry. I'm looking to query this structure and return only the nodes whose city attribute is "Tarzana".

I have been able to grab all of the nodes from firebase and then iterate through them to select and store the ones that match my filter criteria into an array. However, I am almost certain there has to be a more efficient way as I shouldn't have to grab ALL of the data.

Could someone please point me in the direction of how to efficiently query my data with parameters.

You've included a picture of the JSON tree in your question. Please replace that with the actual JSON as text, which you can easily get by clicking the Export button in your Firebase database. Having the JSON as text makes it searchable, allows us to easily use it to test with your actual data and use it in our answer and in general is just a Good Thing to do. — Frank van Puffelen
– Frank van Puffelen, Commented Jun 9, 2016 at 0:05

Frank van Puffelen · Accepted Answer · 2016-06-09 00:45:14Z

4

Try this:

Data.orderByChild("city").equalTo("Tarzana");

edited Jun 9, 2016 at 0:45

Frank van Puffelen

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answered Jun 9, 2016 at 0:14

Ruby_Pry

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3 Comments

Moti Azu Over a year ago

Also, I would index the city field if there's a lot of data there.

Sohrab Hejazi Over a year ago

@MotiAzu What do you mean by index the city field?

Moti Azu Over a year ago

You will need a database index on that field if you are going to query by it. Firebase has indexing available through the rules.

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