How to order the answer from my Firebase

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How to order the answer from my Firebase

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I am getting all my users' service records and showing them, but I would like to define the order in which they should be displayed. For this I added a new field with the name Order . My topic is that I have not been able to find the ordering solution.

Deputy code:

Obtaining data from the database of firebase.

**static getAllServices(callback){
    let pathName = "/user/"
    firebase.database().ref(pathName).on('value', (snapshot) => {
        console.log(snapshot.val())
        let data = snapshot.val()
        let arrayOfServices = []
        if(data){
            for(let key in data){
                let obj = data[key]
                let name = obj.details.name
                let photo = obj.details.url
                let latitude = obj.details.latitude
                let longitude = obj.details.longitude
                let identificador = obj.details.id
                for(let prop in obj){
                    let services = obj[prop]
                    for(let sv in services){
                        if(services[sv].description && services[sv].rubro && services[sv].title && services[sv].image){
                            arrayOfServices.push({
                                userIdent: identificador,
                                userName: name,
                                userPhoto: photo,
                                userLatitude: latitude,
                                userLongitude: longitude,
                                userOrder: services[sv].order,
                                stateOffer: services[sv].stateOffer,
                                title: services[sv].title,
                                description: services[sv].description,
                                rubro: services[sv].rubro,
                                image: services[sv].image
                            })
                        }
                    }
                }
            }
        }
        callback(arrayOfServices)
    })
}**

Call to the function I have inserted records in the list:

 componentWillMount(){
     try{
         let user = firebase.auth().currentUser
         this.setState({
             uid: user.uid,
         })
         Helpers.getAllServices((services) => {
                 if(services){
                     this.setState({
                         dataSource: this.state.dataSource.cloneWithRows(services),
                         rawServices: services
                     })
                 }
         })
     }catch(error){
         console.log(error)
     }
 }

Firebase info:

firebase reactjs react-native

asked by Jose 31.05.2017 в 21:58

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1 answer

Caldera Forms Price Calculation Query linq to get the rows with the oldest date in a data set

score 0 · Accepted Answer

As you have the order inside the services node, I think it is best if you order the array of javascript after having created it in getAllServices() :

arrayOfServices.push({
    userIdent: identificador,
    userName: name,
    userPhoto: photo,
    userLatitude: latitude,
    userLongitude: longitude,
    userOrder: services[sv].order,
    stateOffer: services[sv].stateOffer,
    title: services[sv].title,
    description: services[sv].description,
    rubro: services[sv].rubro,
    image: services[sv].image,
    order: services[sv].order
})

Then you order the array with simple javascript:

arrayOfServices.sort((a, b) => {
  return a.order > b.order;
});

and voila, you return arrayOfServices .