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Compruebe si hay valores en FireBase RealTime DataBase

Tengo una base de datos de firebase que se parece a esto:

ingrese la descripción de la imagen aquí

Quiero verificar si existe un niño 'Datos'.

tengo un comienzo:

 var check = firebase.database().ref().orderByKey().equalTo("data").once("value", function (snapshot) { if (!snapshot.exists()) { firebase.database().ref('data').set({ messages: [], userIds: [], colours: [], names: [], }); }

});

No sé qué poner en la función ref()

about 4 years ago · Juan Pablo Isaza
1 answers
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0

Es mucho más simple de lo que estás intentando:

 var check = firebase.database().ref("data"); check.once("value", function (snapshot) { if (!snapshot.exists()) { ... } });
about 4 years ago · Juan Pablo Isaza Report
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