CODEWITHSUNDEEP
javascriptfirebasefirebase-realtime-database
Missak Boyajian
Missak Boyajian

Reputation: 2245

Firebase Data Download Size

I have been making an ionic app with Firebase but I have a general question.

if I have the database like this:

profile:
{
  101: 
  {
     name: jon
     lastname: snow
     ...
     reservations:
       {
         ..lot of data
       }
     requests:
       {
        ..lot of data
       }
  }
}

If I call from my app services :

firebase.database().ref('/profile/101/reservations).once('value') ...

does it download the whole profile data? because I am concerned about the data usage for the future. Also because I know that if I call only 

firebase.database().ref('/profile/101').once('value') ...

It will download the whole data. I am just concerned if for the first case, it will be the same

Upvotes: 0

Views: 592

Answers (2)

Frank van Puffelen
Frank van Puffelen

Reputation: 598817

When you attach a listener to a location (Reference) (that you have permission to read) in the Firebase Database, it downloads all the data under that location.

When you attach a listener to a query (Query) in a location (that you have permission to read), it downloads all data under the location that matches the query.

Upvotes: 3

Charly berthet
Charly berthet

Reputation: 1296

That's why you have to change your structure to :

profile:
{
  101: 
  {
     name: jon
     lastname: snow
     ...
     reservations: [801,...],
     requests:[....]
  }
},
reservations:{
    801:{
          profileId:101,
         ..lot of data
    },
    ....
},
requests:{
.....
}

Upvotes: 1

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